Toggle SGML Header (+)


Section 1: 10-Q (10-Q)

bokf-20200930
0000875357December 312020Q3FALSE73900008753572020-01-012020-09-30xbrli:shares00008753572020-09-30iso4217:USD00008753572020-07-012020-09-3000008753572019-07-012019-09-3000008753572019-01-012019-09-300000875357bokf:BrokerageandtradingrevenueMember2020-07-012020-09-300000875357bokf:BrokerageandtradingrevenueMember2019-07-012019-09-300000875357bokf:BrokerageandtradingrevenueMember2020-01-012020-09-300000875357bokf:BrokerageandtradingrevenueMember2019-01-012019-09-300000875357bokf:TransactioncardrevenueMember2020-07-012020-09-300000875357bokf:TransactioncardrevenueMember2019-07-012019-09-300000875357bokf:TransactioncardrevenueMember2020-01-012020-09-300000875357bokf:TransactioncardrevenueMember2019-01-012019-09-300000875357us-gaap:FiduciaryAndTrustMember2020-07-012020-09-300000875357us-gaap:FiduciaryAndTrustMember2019-07-012019-09-300000875357us-gaap:FiduciaryAndTrustMember2020-01-012020-09-300000875357us-gaap:FiduciaryAndTrustMember2019-01-012019-09-300000875357us-gaap:DepositAccountMember2020-07-012020-09-300000875357us-gaap:DepositAccountMember2019-07-012019-09-300000875357us-gaap:DepositAccountMember2020-01-012020-09-300000875357us-gaap:DepositAccountMember2019-01-012019-09-300000875357us-gaap:MortgageBankingMember2020-07-012020-09-300000875357us-gaap:MortgageBankingMember2019-07-012019-09-300000875357us-gaap:MortgageBankingMember2020-01-012020-09-300000875357us-gaap:MortgageBankingMember2019-01-012019-09-300000875357us-gaap:FinancialServiceOtherMember2020-07-012020-09-300000875357us-gaap:FinancialServiceOtherMember2019-07-012019-09-300000875357us-gaap:FinancialServiceOtherMember2020-01-012020-09-300000875357us-gaap:FinancialServiceOtherMember2019-01-012019-09-30iso4217:USDxbrli:shares00008753572019-12-310000875357us-gaap:CommonStockMember2020-06-300000875357us-gaap:AdditionalPaidInCapitalMember2020-06-300000875357us-gaap:RetainedEarningsMember2020-06-300000875357us-gaap:TreasuryStockMember2020-06-300000875357us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-06-300000875357us-gaap:ParentMember2020-06-300000875357us-gaap:NoncontrollingInterestMember2020-06-3000008753572020-06-300000875357us-gaap:RetainedEarningsMember2020-07-012020-09-300000875357us-gaap:ParentMember2020-07-012020-09-300000875357us-gaap:NoncontrollingInterestMember2020-07-012020-09-300000875357us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-07-012020-09-300000875357us-gaap:TreasuryStockMember2020-07-012020-09-300000875357us-gaap:CommonStockMember2020-07-012020-09-300000875357us-gaap:AdditionalPaidInCapitalMember2020-07-012020-09-300000875357us-gaap:CommonStockMember2020-09-300000875357us-gaap:AdditionalPaidInCapitalMember2020-09-300000875357us-gaap:RetainedEarningsMember2020-09-300000875357us-gaap:TreasuryStockMember2020-09-300000875357us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-09-300000875357us-gaap:ParentMember2020-09-300000875357us-gaap:NoncontrollingInterestMember2020-09-300000875357us-gaap:CommonStockMember2019-12-310000875357us-gaap:AdditionalPaidInCapitalMember2019-12-310000875357us-gaap:RetainedEarningsMember2019-12-310000875357us-gaap:TreasuryStockMember2019-12-310000875357us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000875357us-gaap:ParentMember2019-12-310000875357us-gaap:NoncontrollingInterestMember2019-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:RetainedEarningsMember2019-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:ParentMember2019-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310000875357us-gaap:CommonStockMembersrt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2019-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:AdditionalPaidInCapitalMember2019-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:RetainedEarningsMember2019-12-310000875357us-gaap:TreasuryStockMembersrt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2019-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:ParentMember2019-12-310000875357us-gaap:NoncontrollingInterestMembersrt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2019-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2019-12-310000875357us-gaap:RetainedEarningsMember2020-01-012020-09-300000875357us-gaap:ParentMember2020-01-012020-09-300000875357us-gaap:NoncontrollingInterestMember2020-01-012020-09-300000875357us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-09-300000875357us-gaap:TreasuryStockMember2020-01-012020-09-300000875357us-gaap:CommonStockMember2020-01-012020-09-300000875357us-gaap:AdditionalPaidInCapitalMember2020-01-012020-09-300000875357us-gaap:CommonStockMember2019-06-300000875357us-gaap:AdditionalPaidInCapitalMember2019-06-300000875357us-gaap:RetainedEarningsMember2019-06-300000875357us-gaap:TreasuryStockMember2019-06-300000875357us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-06-300000875357us-gaap:ParentMember2019-06-300000875357us-gaap:NoncontrollingInterestMember2019-06-3000008753572019-06-300000875357us-gaap:RetainedEarningsMember2019-07-012019-09-300000875357us-gaap:ParentMember2019-07-012019-09-300000875357us-gaap:NoncontrollingInterestMember2019-07-012019-09-300000875357us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-07-012019-09-300000875357us-gaap:TreasuryStockMember2019-07-012019-09-300000875357us-gaap:CommonStockMember2019-07-012019-09-300000875357us-gaap:AdditionalPaidInCapitalMember2019-07-012019-09-300000875357us-gaap:CommonStockMember2019-09-300000875357us-gaap:AdditionalPaidInCapitalMember2019-09-300000875357us-gaap:RetainedEarningsMember2019-09-300000875357us-gaap:TreasuryStockMember2019-09-300000875357us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-09-300000875357us-gaap:ParentMember2019-09-300000875357us-gaap:NoncontrollingInterestMember2019-09-3000008753572019-09-300000875357us-gaap:CommonStockMember2018-12-310000875357us-gaap:AdditionalPaidInCapitalMember2018-12-310000875357us-gaap:RetainedEarningsMember2018-12-310000875357us-gaap:TreasuryStockMember2018-12-310000875357us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310000875357us-gaap:ParentMember2018-12-310000875357us-gaap:NoncontrollingInterestMember2018-12-3100008753572018-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:RetainedEarningsMember2018-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:ParentMember2018-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2018-12-310000875357us-gaap:CommonStockMembersrt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2018-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:AdditionalPaidInCapitalMember2018-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:RetainedEarningsMember2018-12-310000875357us-gaap:TreasuryStockMembersrt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2018-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:ParentMember2018-12-310000875357us-gaap:NoncontrollingInterestMembersrt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2018-12-310000875357srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2018-12-310000875357us-gaap:RetainedEarningsMember2019-01-012019-09-300000875357us-gaap:ParentMember2019-01-012019-09-300000875357us-gaap:NoncontrollingInterestMember2019-01-012019-09-300000875357us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-09-300000875357us-gaap:TreasuryStockMember2019-01-012019-09-300000875357us-gaap:CommonStockMember2019-01-012019-09-300000875357us-gaap:AdditionalPaidInCapitalMember2019-01-012019-09-300000875357us-gaap:USTreasuryAndGovernmentMember2020-09-300000875357us-gaap:USTreasuryAndGovernmentMember2019-12-310000875357us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-09-300000875357us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2019-12-310000875357us-gaap:USStatesAndPoliticalSubdivisionsMember2020-09-300000875357us-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000875357us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2020-09-300000875357us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMember2019-12-310000875357us-gaap:FixedIncomeSecuritiesMember2020-09-30xbrli:pure0000875357us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-01-012020-09-300000875357us-gaap:USTreasurySecuritiesMember2020-09-300000875357us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2020-09-300000875357us-gaap:CommercialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:USTreasurySecuritiesMember2019-12-310000875357us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2019-12-310000875357us-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000875357us-gaap:ResidentialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:ResidentialMortgageBackedSecuritiesMember2020-01-012020-09-300000875357us-gaap:NondesignatedMemberus-gaap:InterestRateSwapMember2020-09-300000875357us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMember2020-09-300000875357bokf:AgriculturalContractsMemberus-gaap:NondesignatedMember2020-09-300000875357us-gaap:ForeignExchangeContractMemberus-gaap:NondesignatedMember2020-09-300000875357us-gaap:EquitySwapMemberus-gaap:NondesignatedMember2020-09-300000875357bokf:CustomerRiskManagementProgramsMemberus-gaap:NondesignatedMember2020-09-300000875357bokf:TradingMemberus-gaap:NondesignatedMember2020-09-300000875357bokf:InternalRiskManagementProgramsMemberus-gaap:NondesignatedMember2020-09-300000875357us-gaap:NondesignatedMember2020-09-300000875357us-gaap:NondesignatedMemberus-gaap:InterestRateSwapMember2019-12-310000875357us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMember2019-12-310000875357bokf:AgriculturalContractsMemberus-gaap:NondesignatedMember2019-12-310000875357us-gaap:ForeignExchangeContractMemberus-gaap:NondesignatedMember2019-12-310000875357us-gaap:EquitySwapMemberus-gaap:NondesignatedMember2019-12-310000875357bokf:CustomerRiskManagementProgramsMemberus-gaap:NondesignatedMember2019-12-310000875357bokf:TradingMemberus-gaap:NondesignatedMember2019-12-310000875357bokf:InternalRiskManagementProgramsMemberus-gaap:NondesignatedMember2019-12-310000875357us-gaap:NondesignatedMember2019-12-310000875357us-gaap:NondesignatedMemberbokf:TbaResidentialMortgageBackedSecuritiesMember2020-07-012020-09-300000875357us-gaap:NondesignatedMemberbokf:TbaResidentialMortgageBackedSecuritiesMember2019-07-012019-09-300000875357us-gaap:NondesignatedMemberus-gaap:InterestRateSwapMember2020-07-012020-09-300000875357us-gaap:NondesignatedMemberus-gaap:InterestRateSwapMember2019-07-012019-09-300000875357us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMember2020-07-012020-09-300000875357us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMember2019-07-012019-09-300000875357bokf:AgriculturalContractsMemberus-gaap:NondesignatedMember2020-07-012020-09-300000875357bokf:AgriculturalContractsMemberus-gaap:NondesignatedMember2019-07-012019-09-300000875357us-gaap:ForeignExchangeContractMemberus-gaap:NondesignatedMember2020-07-012020-09-300000875357us-gaap:ForeignExchangeContractMemberus-gaap:NondesignatedMember2019-07-012019-09-300000875357us-gaap:EquitySwapMemberus-gaap:NondesignatedMember2020-07-012020-09-300000875357us-gaap:EquitySwapMemberus-gaap:NondesignatedMember2019-07-012019-09-300000875357bokf:CustomerRiskManagementProgramsMemberus-gaap:NondesignatedMember2020-07-012020-09-300000875357bokf:CustomerRiskManagementProgramsMemberus-gaap:NondesignatedMember2019-07-012019-09-300000875357bokf:TradingMemberus-gaap:NondesignatedMember2020-07-012020-09-300000875357bokf:TradingMemberus-gaap:NondesignatedMember2019-07-012019-09-300000875357bokf:InternalRiskManagementProgramsMemberus-gaap:NondesignatedMember2020-07-012020-09-300000875357bokf:InternalRiskManagementProgramsMemberus-gaap:NondesignatedMember2019-07-012019-09-300000875357us-gaap:NondesignatedMember2020-07-012020-09-300000875357us-gaap:NondesignatedMember2019-07-012019-09-300000875357us-gaap:NondesignatedMemberbokf:TbaResidentialMortgageBackedSecuritiesMember2020-01-012020-09-300000875357us-gaap:NondesignatedMemberbokf:TbaResidentialMortgageBackedSecuritiesMember2019-01-012019-09-300000875357us-gaap:NondesignatedMemberus-gaap:InterestRateSwapMember2020-01-012020-09-300000875357us-gaap:NondesignatedMemberus-gaap:InterestRateSwapMember2019-01-012019-09-300000875357us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMember2020-01-012020-09-300000875357us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMember2019-01-012019-09-300000875357bokf:AgriculturalContractsMemberus-gaap:NondesignatedMember2020-01-012020-09-300000875357bokf:AgriculturalContractsMemberus-gaap:NondesignatedMember2019-01-012019-09-300000875357us-gaap:ForeignExchangeContractMemberus-gaap:NondesignatedMember2020-01-012020-09-300000875357us-gaap:ForeignExchangeContractMemberus-gaap:NondesignatedMember2019-01-012019-09-300000875357us-gaap:EquitySwapMemberus-gaap:NondesignatedMember2020-01-012020-09-300000875357us-gaap:EquitySwapMemberus-gaap:NondesignatedMember2019-01-012019-09-300000875357bokf:CustomerRiskManagementProgramsMemberus-gaap:NondesignatedMember2020-01-012020-09-300000875357bokf:CustomerRiskManagementProgramsMemberus-gaap:NondesignatedMember2019-01-012019-09-300000875357bokf:TradingMemberus-gaap:NondesignatedMember2020-01-012020-09-300000875357bokf:TradingMemberus-gaap:NondesignatedMember2019-01-012019-09-300000875357bokf:InternalRiskManagementProgramsMemberus-gaap:NondesignatedMember2020-01-012020-09-300000875357bokf:InternalRiskManagementProgramsMemberus-gaap:NondesignatedMember2019-01-012019-09-300000875357us-gaap:NondesignatedMember2020-01-012020-09-300000875357us-gaap:NondesignatedMember2019-01-012019-09-300000875357us-gaap:CommercialPortfolioSegmentMember2020-09-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMember2020-09-300000875357bokf:PaycheckProtectionProgramMember2020-09-300000875357bokf:LoanstoindividualsMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMember2020-06-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMember2020-06-300000875357bokf:PaycheckProtectionProgramMember2020-06-300000875357bokf:LoanstoindividualsMember2020-06-300000875357us-gaap:UnallocatedFinancingReceivablesMember2020-06-300000875357us-gaap:CommercialPortfolioSegmentMember2020-07-012020-09-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMember2020-07-012020-09-300000875357bokf:PaycheckProtectionProgramMember2020-07-012020-09-300000875357bokf:LoanstoindividualsMember2020-07-012020-09-300000875357us-gaap:UnallocatedFinancingReceivablesMember2020-07-012020-09-300000875357us-gaap:UnallocatedFinancingReceivablesMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMembersrt:ScenarioPreviouslyReportedMember2019-12-310000875357srt:ScenarioPreviouslyReportedMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357srt:ScenarioPreviouslyReportedMemberbokf:PaycheckProtectionProgramMember2019-12-310000875357srt:ScenarioPreviouslyReportedMemberbokf:LoanstoindividualsMember2019-12-310000875357us-gaap:UnallocatedFinancingReceivablesMembersrt:ScenarioPreviouslyReportedMember2019-12-310000875357srt:ScenarioPreviouslyReportedMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMembersrt:RestatementAdjustmentMember2019-12-310000875357srt:RestatementAdjustmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357srt:RestatementAdjustmentMemberbokf:PaycheckProtectionProgramMember2019-12-310000875357srt:RestatementAdjustmentMemberbokf:LoanstoindividualsMember2019-12-310000875357us-gaap:UnallocatedFinancingReceivablesMembersrt:RestatementAdjustmentMember2019-12-310000875357srt:RestatementAdjustmentMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357bokf:PaycheckProtectionProgramMember2019-12-310000875357bokf:LoanstoindividualsMember2019-12-310000875357us-gaap:UnallocatedFinancingReceivablesMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMember2020-01-012020-09-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMember2020-01-012020-09-300000875357bokf:PaycheckProtectionProgramMember2020-01-012020-09-300000875357bokf:LoanstoindividualsMember2020-01-012020-09-300000875357us-gaap:UnallocatedFinancingReceivablesMember2020-01-012020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMemberbokf:EnergyMember2020-09-300000875357us-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberbokf:EnergyMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMemberbokf:EnergyMember2020-09-300000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMemberbokf:NonaccruingsubstandardanddoubtfulMemberbokf:EnergyMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberbokf:EnergyMember2020-09-300000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:HealthCareMemberus-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:HealthCareMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMemberbokf:NonaccruingsubstandardanddoubtfulMember2020-09-300000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberbokf:ServicesMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberbokf:NonaccruingsubstandardanddoubtfulMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMember2020-09-300000875357bokf:GeneralbusinessmemberMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357bokf:GeneralbusinessmemberMemberus-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357bokf:GeneralbusinessmemberMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357bokf:GeneralbusinessmemberMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMemberbokf:NonaccruingsubstandardanddoubtfulMember2020-09-300000875357bokf:GeneralbusinessmemberMemberus-gaap:CommercialPortfolioSegmentMember2020-09-300000875357us-gaap:PassMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:SpecialMentionMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:SubstandardMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberbokf:NonaccruingsubstandardanddoubtfulMember2020-09-300000875357us-gaap:PassMemberbokf:PaycheckProtectionProgramMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:PassMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:SpecialMentionMemberus-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:SubstandardMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberbokf:LoanstoindividualsMemberbokf:NonaccruingsubstandardanddoubtfulMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberus-gaap:PassMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberus-gaap:NonperformingFinancingReceivableMemberbokf:LoanstoindividualsMemberbokf:NonaccruingsubstandardanddoubtfulMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMember2020-09-300000875357us-gaap:PassMemberus-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:SpecialMentionMemberus-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:SubstandardMemberus-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberbokf:NonaccruingsubstandardanddoubtfulMember2020-09-300000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2020-09-300000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMemberbokf:EnergyMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberbokf:LoanstoindividualsMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMemberbokf:EnergyMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberbokf:EnergyMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberbokf:EnergyMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357bokf:GeneralbusinessmemberMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357bokf:GeneralbusinessmemberMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357bokf:GeneralbusinessmemberMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357bokf:PaycheckProtectionProgramMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357bokf:PaycheckProtectionProgramMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357bokf:PaycheckProtectionProgramMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357bokf:LoanstoindividualsMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357bokf:LoanstoindividualsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357bokf:LoanstoindividualsMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300000875357us-gaap:FinancingReceivables30To59DaysPastDueMember2020-09-300000875357us-gaap:FinancingReceivables60To89DaysPastDueMember2020-09-300000875357us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-3000008753572019-01-012019-12-310000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-12-310000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMember2019-06-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMember2019-06-300000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-06-300000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-06-300000875357us-gaap:UnallocatedFinancingReceivablesMember2019-06-300000875357us-gaap:CommercialPortfolioSegmentMember2019-07-012019-09-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMember2019-07-012019-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-07-012019-09-300000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-07-012019-09-300000875357us-gaap:UnallocatedFinancingReceivablesMember2019-07-012019-09-300000875357us-gaap:CommercialPortfolioSegmentMember2019-09-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMember2019-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-09-300000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-09-300000875357us-gaap:UnallocatedFinancingReceivablesMember2019-09-300000875357us-gaap:CommercialPortfolioSegmentMember2018-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMember2018-12-310000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMember2018-12-310000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMember2018-12-310000875357us-gaap:UnallocatedFinancingReceivablesMember2018-12-310000875357us-gaap:CommercialPortfolioSegmentMember2019-01-012019-09-300000875357us-gaap:CommercialRealEstatePortfolioSegmentMember2019-01-012019-09-300000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-01-012019-09-300000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-01-012019-09-300000875357us-gaap:UnallocatedFinancingReceivablesMember2019-01-012019-09-300000875357bokf:SpecificAllowanceMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMemberbokf:EnergyMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberbokf:EnergyMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMemberbokf:EnergyMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMemberbokf:EnergyMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberbokf:EnergyMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:EnergyMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberbokf:ServicesMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberbokf:WholesaleAndRetailMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberbokf:WholesaleAndRetailMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMemberbokf:WholesaleAndRetailMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMemberbokf:WholesaleAndRetailMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:WholesaleAndRetailMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:WholesaleAndRetailMember2019-12-310000875357bokf:ManufacturingMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberbokf:ManufacturingMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:ManufacturingMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:ManufacturingMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMember2019-12-310000875357bokf:ManufacturingMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:ManufacturingMemberus-gaap:CommercialPortfolioSegmentMember2019-12-310000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:HealthCareMemberus-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:HealthCareMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMember2019-12-310000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberbokf:PublicFinanceMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberbokf:PublicFinanceMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMemberbokf:PublicFinanceMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMemberbokf:PublicFinanceMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:PublicFinanceMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:PublicFinanceMember2019-12-310000875357bokf:OtherCommercialAndIndustrialMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:OtherCommercialAndIndustrialMemberus-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:OtherCommercialAndIndustrialMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:OtherCommercialAndIndustrialMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMember2019-12-310000875357bokf:OtherCommercialAndIndustrialMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:OtherCommercialAndIndustrialMemberus-gaap:CommercialPortfolioSegmentMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialPortfolioSegmentMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:PassMemberbokf:ResidentialconstructionandlanddevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberbokf:ResidentialconstructionandlanddevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SubstandardMemberbokf:ResidentialconstructionandlanddevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberbokf:ResidentialconstructionandlanddevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357bokf:ResidentialconstructionandlanddevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:ResidentialconstructionandlanddevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357us-gaap:PassMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:RetailMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:RetailMember2019-12-310000875357us-gaap:SubstandardMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:RetailMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:RetailMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:RetailMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:RetailMember2019-12-310000875357bokf:OfficeMemberus-gaap:PassMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:OfficeMemberus-gaap:SpecialMentionMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:OfficeMemberus-gaap:SubstandardMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:OfficeMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357bokf:OfficeMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:OfficeMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357us-gaap:PassMemberus-gaap:CommercialRealEstatePortfolioSegmentMembersrt:MultifamilyMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:CommercialRealEstatePortfolioSegmentMembersrt:MultifamilyMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SubstandardMemberus-gaap:CommercialRealEstatePortfolioSegmentMembersrt:MultifamilyMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialRealEstatePortfolioSegmentMembersrt:MultifamilyMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMembersrt:MultifamilyMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMembersrt:MultifamilyMember2019-12-310000875357bokf:IndustrialMemberus-gaap:PassMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberbokf:IndustrialMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:IndustrialMemberus-gaap:SubstandardMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberbokf:IndustrialMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357bokf:IndustrialMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:IndustrialMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357us-gaap:PassMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberbokf:OtherCommercialRealEstateMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberbokf:OtherCommercialRealEstateMember2019-12-310000875357us-gaap:SubstandardMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberbokf:OtherCommercialRealEstateMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberbokf:OtherCommercialRealEstateMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberbokf:OtherCommercialRealEstateMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberbokf:OtherCommercialRealEstateMember2019-12-310000875357us-gaap:PassMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SubstandardMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:PassMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:SpecialMentionMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:SubstandardMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:NonperformingFinancingReceivableMemberbokf:LoanstoindividualsMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberbokf:LoanstoindividualsMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberus-gaap:PassMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:SpecialMentionMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberus-gaap:SubstandardMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMember2019-12-310000875357us-gaap:PassMemberbokf:LoanstoindividualsMemberus-gaap:HomeEquityLoanMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberbokf:LoanstoindividualsMemberus-gaap:HomeEquityLoanMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SubstandardMemberbokf:LoanstoindividualsMemberus-gaap:HomeEquityLoanMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberbokf:LoanstoindividualsMemberus-gaap:HomeEquityLoanMember2019-12-310000875357bokf:LoanstoindividualsMemberus-gaap:HomeEquityLoanMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357bokf:LoanstoindividualsMemberus-gaap:HomeEquityLoanMember2019-12-310000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:PassMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:SubstandardMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberbokf:LoanstoindividualsMember2019-12-310000875357us-gaap:ResidentialPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:PassMemberus-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SubstandardMemberus-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMemberus-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMember2019-12-310000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SpecialMentionMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:SubstandardMemberus-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:NonperformingFinancingReceivableMember2019-12-310000875357us-gaap:PerformingFinancingReceivableMember2019-12-310000875357us-gaap:HomeEquityMemberbokf:LoanstoindividualsMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMemberbokf:EnergyMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:EnergyMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:EnergyMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:ServicesMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:WholesaleAndRetailMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:WholesaleAndRetailMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:WholesaleAndRetailMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357bokf:ManufacturingMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357bokf:ManufacturingMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357bokf:ManufacturingMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:HealthCareMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:PublicFinanceMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:PublicFinanceMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberbokf:PublicFinanceMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357bokf:OtherCommercialAndIndustrialMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357bokf:OtherCommercialAndIndustrialMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357bokf:OtherCommercialAndIndustrialMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357bokf:ResidentialconstructionandlanddevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357bokf:ResidentialconstructionandlanddevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357bokf:ResidentialconstructionandlanddevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RetailMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:RetailMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:RetailMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357bokf:OfficeMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357bokf:OfficeMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357bokf:OfficeMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMembersrt:MultifamilyMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMembersrt:MultifamilyMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMembersrt:MultifamilyMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357bokf:IndustrialMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357bokf:IndustrialMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357bokf:IndustrialMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMemberbokf:OtherCommercialRealEstateMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberbokf:OtherCommercialRealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberbokf:OtherCommercialRealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357bokf:PermanentResidentialMortgageMemberus-gaap:UsGovernmentAgencyInsuredLoansMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:HomeEquityMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357us-gaap:HomeEquityMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:HomeEquityMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357bokf:LoanstoindividualsMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357bokf:LoanstoindividualsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357bokf:LoanstoindividualsMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:ConsumerPortfolioSegmentMemberbokf:LoanstoindividualsMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:FinancingReceivables30To59DaysPastDueMember2019-12-310000875357us-gaap:FinancingReceivables60To89DaysPastDueMember2019-12-310000875357us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310000875357us-gaap:NondesignatedMemberbokf:ResidentialMortgageLoanCommitmentsMember2019-01-012019-12-310000875357us-gaap:NondesignatedMemberbokf:ResidentialMortgageLoanCommitmentsMember2020-01-012020-09-300000875357bokf:ForwardSalesContractsMemberus-gaap:NondesignatedMember2019-01-012019-12-310000875357bokf:ForwardSalesContractsMemberus-gaap:NondesignatedMember2020-01-012020-09-300000875357us-gaap:NondesignatedMemberbokf:ResidentialMortgageLoanCommitmentsMember2020-09-300000875357us-gaap:NondesignatedMemberbokf:ResidentialMortgageLoanCommitmentsMember2019-12-310000875357bokf:ForwardSalesContractsMemberus-gaap:NondesignatedMember2020-09-300000875357bokf:ForwardSalesContractsMemberus-gaap:NondesignatedMember2019-12-310000875357bokf:MisuseofRevenuesPledgedtoMunicipalBondsMemberus-gaap:JudicialRulingMember2020-01-012020-09-300000875357us-gaap:PendingLitigationMemberbokf:MisuseofRevenuesPledgedtoMunicipalBondsMember2020-01-012020-09-300000875357us-gaap:PendingLitigationMemberbokf:BankParticipationinFraudulentSaleofSecuritiesbyPrincipalsMember2020-01-012020-09-300000875357us-gaap:PendingLitigationMemberbokf:BankParticipationinFraudulentSaleofSecuritiesbyPrincipalsMember2020-09-300000875357us-gaap:PendingLitigationMemberbokf:PurchaseoffacilitiesfromprincipalssubjecttoSECNewJerseyproceedingsMember2020-01-012020-09-300000875357us-gaap:PendingLitigationMemberbokf:PurchaseoffacilitiesfromprincipalssubjecttoSECNewJerseyproceedingsMember2020-09-300000875357bokf:InclusionofProprietaryInvestmentProductsasInvestmentOptionsin401kPlanWhoseFeesWereTooHighandPerformanceTooLowMemberus-gaap:PendingLitigationMember2020-01-012020-09-300000875357us-gaap:OtherAssetsMember2020-09-300000875357us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:OtherLiabilitiesMember2020-09-300000875357us-gaap:SubsequentEventMember2020-11-032020-11-030000875357us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2018-12-310000875357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-12-310000875357us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-01-012019-09-300000875357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-01-012019-09-300000875357us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-09-300000875357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-09-300000875357us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-12-310000875357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310000875357us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-01-012020-09-300000875357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-09-300000875357us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-09-300000875357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:GainlossontradingMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:GainlossontradingMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:GainlossontradingMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:GainlossontradingMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:GainlossontradingMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:CustomerhedgingrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CustomerhedgingrevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:RetailbrokeragerevenueMember2020-07-012020-09-300000875357bokf:RetailbrokeragerevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:InsurancebrokeragerevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:InsurancebrokeragerevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:InvestmentbankingrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:InvestmentbankingrevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:BrokerageandtradingrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMemberbokf:TransFundEFTnetworkrevenueMember2020-07-012020-09-300000875357us-gaap:OperatingSegmentsMemberbokf:ConsumerMemberbokf:TransFundEFTnetworkrevenueMember2020-07-012020-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMemberbokf:TransFundEFTnetworkrevenueMember2020-07-012020-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:TransFundEFTnetworkrevenueMember2020-07-012020-09-300000875357bokf:TransFundEFTnetworkrevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:MerchantservicesrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:MerchantservicesrevenueMember2020-07-012020-09-300000875357bokf:CorporatecardrevenueMemberbokf:CommercialMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:CorporatecardrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:CorporatecardrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:CorporatecardrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CorporatecardrevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:TransactioncardrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:PersonaltrustrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:PersonaltrustrevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:CorporatetrustrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CorporatetrustrevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:InvestmentmanagementservicesandotherMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:InvestmentmanagementservicesandotherMember2020-07-012020-09-300000875357bokf:CommercialMemberus-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberus-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:FiduciaryAndTrustMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:CommercialaccountservicechargerevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CommercialaccountservicechargerevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:OverdraftfeerevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:OverdraftfeerevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:CheckcardfeerevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CheckcardfeerevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberus-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberus-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:DepositAccountMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:MortgageproductionrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:MortgageproductionrevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMember2020-07-012020-09-300000875357us-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMember2020-07-012020-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:MortgageservicingrevenueMember2020-07-012020-09-300000875357bokf:MortgageservicingrevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberus-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberus-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:MortgageBankingMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CommercialMemberus-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberus-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357us-gaap:FinancialServiceOtherMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-07-012020-09-300000875357bokf:WealthManagementMemberbokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000875357bokf:FeesandcommissionsrevenueMemberus-gaap:CorporateNonSegmentMember2020-07-012020-09-300000875357bokf:FeesandcommissionsrevenueMember2020-07-012020-09-300000875357bokf:CommercialMemberbokf:GainlossontradingMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:GainlossontradingMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:GainlossontradingMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:GainlossontradingMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:GainlossontradingMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:CustomerhedgingrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CustomerhedgingrevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:RetailbrokeragerevenueMember2020-01-012020-09-300000875357bokf:RetailbrokeragerevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:InsurancebrokeragerevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:InsurancebrokeragerevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:InvestmentbankingrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:InvestmentbankingrevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:BrokerageandtradingrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMemberbokf:TransFundEFTnetworkrevenueMember2020-01-012020-09-300000875357us-gaap:OperatingSegmentsMemberbokf:ConsumerMemberbokf:TransFundEFTnetworkrevenueMember2020-01-012020-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMemberbokf:TransFundEFTnetworkrevenueMember2020-01-012020-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:TransFundEFTnetworkrevenueMember2020-01-012020-09-300000875357bokf:TransFundEFTnetworkrevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:MerchantservicesrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:MerchantservicesrevenueMember2020-01-012020-09-300000875357bokf:CorporatecardrevenueMemberbokf:CommercialMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:CorporatecardrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:CorporatecardrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:CorporatecardrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CorporatecardrevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:TransactioncardrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:PersonaltrustrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:PersonaltrustrevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:CorporatetrustrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CorporatetrustrevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:InvestmentmanagementservicesandotherMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:InvestmentmanagementservicesandotherMember2020-01-012020-09-300000875357bokf:CommercialMemberus-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberus-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:FiduciaryAndTrustMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:CommercialaccountservicechargerevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CommercialaccountservicechargerevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:OverdraftfeerevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:OverdraftfeerevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:CheckcardfeerevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CheckcardfeerevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberus-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberus-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:DepositAccountMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:MortgageproductionrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:MortgageproductionrevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMember2020-01-012020-09-300000875357us-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMember2020-01-012020-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:MortgageservicingrevenueMember2020-01-012020-09-300000875357bokf:MortgageservicingrevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberus-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberus-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:MortgageBankingMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CommercialMemberus-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberus-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357us-gaap:FinancialServiceOtherMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2020-01-012020-09-300000875357bokf:WealthManagementMemberbokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000875357bokf:FeesandcommissionsrevenueMemberus-gaap:CorporateNonSegmentMember2020-01-012020-09-300000875357bokf:FeesandcommissionsrevenueMember2020-01-012020-09-300000875357bokf:CommercialMemberbokf:GainlossontradingMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:GainlossontradingMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:GainlossontradingMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:GainlossontradingMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:GainlossontradingMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:CustomerhedgingrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CustomerhedgingrevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:RetailbrokeragerevenueMember2019-07-012019-09-300000875357bokf:RetailbrokeragerevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:InsurancebrokeragerevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:InsurancebrokeragerevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:InvestmentbankingrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:InvestmentbankingrevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:BrokerageandtradingrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMemberbokf:TransFundEFTnetworkrevenueMember2019-07-012019-09-300000875357us-gaap:OperatingSegmentsMemberbokf:ConsumerMemberbokf:TransFundEFTnetworkrevenueMember2019-07-012019-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMemberbokf:TransFundEFTnetworkrevenueMember2019-07-012019-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:TransFundEFTnetworkrevenueMember2019-07-012019-09-300000875357bokf:TransFundEFTnetworkrevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:MerchantservicesrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:MerchantservicesrevenueMember2019-07-012019-09-300000875357bokf:CorporatecardrevenueMemberbokf:CommercialMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:CorporatecardrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:CorporatecardrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:CorporatecardrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CorporatecardrevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:TransactioncardrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:PersonaltrustrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:PersonaltrustrevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:CorporatetrustrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CorporatetrustrevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:InvestmentmanagementservicesandotherMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:InvestmentmanagementservicesandotherMember2019-07-012019-09-300000875357bokf:CommercialMemberus-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberus-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:FiduciaryAndTrustMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:CommercialaccountservicechargerevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CommercialaccountservicechargerevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:OverdraftfeerevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:OverdraftfeerevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:CheckcardfeerevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CheckcardfeerevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberus-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberus-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:DepositAccountMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:MortgageproductionrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:MortgageproductionrevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMember2019-07-012019-09-300000875357us-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMember2019-07-012019-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:MortgageservicingrevenueMember2019-07-012019-09-300000875357bokf:MortgageservicingrevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberus-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberus-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:MortgageBankingMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CommercialMemberus-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberus-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357us-gaap:FinancialServiceOtherMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-07-012019-09-300000875357bokf:WealthManagementMemberbokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMember2019-07-012019-09-300000875357bokf:FeesandcommissionsrevenueMemberus-gaap:CorporateNonSegmentMember2019-07-012019-09-300000875357bokf:FeesandcommissionsrevenueMember2019-07-012019-09-300000875357bokf:CommercialMemberbokf:GainlossontradingMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:GainlossontradingMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:GainlossontradingMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:GainlossontradingMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:GainlossontradingMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:CustomerhedgingrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:CustomerhedgingrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CustomerhedgingrevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:RetailbrokeragerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:RetailbrokeragerevenueMember2019-01-012019-09-300000875357bokf:RetailbrokeragerevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:InsurancebrokeragerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:InsurancebrokeragerevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:InsurancebrokeragerevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:InvestmentbankingrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:InvestmentbankingrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:InvestmentbankingrevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:BrokerageandtradingrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:BrokerageandtradingrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMemberbokf:TransFundEFTnetworkrevenueMember2019-01-012019-09-300000875357us-gaap:OperatingSegmentsMemberbokf:ConsumerMemberbokf:TransFundEFTnetworkrevenueMember2019-01-012019-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMemberbokf:TransFundEFTnetworkrevenueMember2019-01-012019-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:TransFundEFTnetworkrevenueMember2019-01-012019-09-300000875357bokf:TransFundEFTnetworkrevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:MerchantservicesrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:MerchantservicesrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:MerchantservicesrevenueMember2019-01-012019-09-300000875357bokf:CorporatecardrevenueMemberbokf:CommercialMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:CorporatecardrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:CorporatecardrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:CorporatecardrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CorporatecardrevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:TransactioncardrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:TransactioncardrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:PersonaltrustrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:PersonaltrustrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:PersonaltrustrevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:CorporatetrustrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:CorporatetrustrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CorporatetrustrevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:InstitutionaltrustretirementplanservicesrevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:InvestmentmanagementservicesandotherMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:InvestmentmanagementservicesandotherMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:InvestmentmanagementservicesandotherMember2019-01-012019-09-300000875357bokf:CommercialMemberus-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberus-gaap:FiduciaryAndTrustMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:FiduciaryAndTrustMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:CommercialaccountservicechargerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:CommercialaccountservicechargerevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CommercialaccountservicechargerevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:OverdraftfeerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:OverdraftfeerevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:OverdraftfeerevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:CheckcardfeerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:CheckcardfeerevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CheckcardfeerevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:AutomatedservicechargeandotherdepositfeerevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberus-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberus-gaap:DepositAccountMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:DepositAccountMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:MortgageproductionrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:MortgageproductionrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:MortgageproductionrevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberus-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMember2019-01-012019-09-300000875357us-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberus-gaap:OperatingSegmentsMemberbokf:MortgageservicingrevenueMember2019-01-012019-09-300000875357us-gaap:CorporateNonSegmentMemberbokf:MortgageservicingrevenueMember2019-01-012019-09-300000875357bokf:MortgageservicingrevenueMember2019-01-012019-09-300000875357bokf:CommercialMemberus-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberus-gaap:MortgageBankingMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:MortgageBankingMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CommercialMemberus-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberus-gaap:FinancialServiceOtherMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357us-gaap:FinancialServiceOtherMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:CommercialMemberbokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMemberbokf:ConsumerMember2019-01-012019-09-300000875357bokf:WealthManagementMemberbokf:FeesandcommissionsrevenueMemberus-gaap:OperatingSegmentsMember2019-01-012019-09-300000875357bokf:FeesandcommissionsrevenueMemberus-gaap:CorporateNonSegmentMember2019-01-012019-09-300000875357bokf:FeesandcommissionsrevenueMember2019-01-012019-09-300000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-09-300000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasurySecuritiesMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasurySecuritiesMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasurySecuritiesMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:FairValueInputsLevel1Member2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:CommercialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2019-12-310000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasurySecuritiesMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasurySecuritiesMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasurySecuritiesMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:FairValueInputsLevel1Member2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000875357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2020-06-300000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2020-06-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2020-07-012020-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2020-07-012020-09-300000875357bokf:MortgagebankingrevenueMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2020-07-012020-09-300000875357bokf:MortgagebankingrevenueMemberus-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2020-07-012020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2020-01-012020-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-09-300000875357bokf:MortgagebankingrevenueMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2020-01-012020-09-300000875357bokf:MortgagebankingrevenueMemberus-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2019-06-300000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2019-06-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2019-07-012019-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2019-07-012019-09-300000875357bokf:MortgagebankingrevenueMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2019-07-012019-09-300000875357bokf:MortgagebankingrevenueMemberus-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2019-07-012019-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2019-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2019-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2018-12-310000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2019-01-012019-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-09-300000875357bokf:MortgagebankingrevenueMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2019-01-012019-09-300000875357bokf:MortgagebankingrevenueMemberus-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsRecurringMemberbokf:InterestRateSpreadMemberus-gaap:AvailableforsaleSecuritiesMember2020-09-300000875357srt:MinimumMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMemberbokf:QuotedpricesofloanssoldinsecuritizationtransactionswithaliquiditydiscountappliedMemberus-gaap:MeasurementInputDiscountForLackOfMarketabilityMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsRecurringMemberbokf:InterestRateSpreadMemberus-gaap:AvailableforsaleSecuritiesMember2019-12-310000875357srt:MinimumMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberbokf:ResidentialMortgageLoansHeldforSaleMemberus-gaap:FairValueMeasurementsRecurringMemberbokf:QuotedpricesofloanssoldinsecuritizationtransactionswithaliquiditydiscountappliedMemberus-gaap:MeasurementInputDiscountForLackOfMarketabilityMember2019-12-310000875357us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Memberbokf:FairValueNonaccruingLoansMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2020-09-300000875357us-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2020-07-012020-09-300000875357us-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2020-01-012020-09-300000875357bokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Member2020-09-300000875357bokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsNonrecurringMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-09-300000875357bokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-07-012020-09-300000875357bokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-01-012020-09-300000875357us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Memberbokf:FairValueNonaccruingLoansMember2019-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2019-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2019-09-300000875357us-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2019-07-012019-09-300000875357us-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2019-01-012019-09-300000875357bokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Member2019-09-300000875357bokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsNonrecurringMember2019-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-09-300000875357bokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-07-012019-09-300000875357bokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-01-012019-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:ManagementknowledgeofIndustryMemberbokf:FairValueNonaccruingLoansMember2020-09-300000875357srt:MinimumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2020-09-300000875357us-gaap:FairValueInputsLevel3Membersrt:MaximumMemberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2020-09-300000875357us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:ManagementknowledgeofIndustryMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:ManagementknowledgeofIndustryMemberbokf:FairValueNonaccruingLoansMember2019-09-300000875357srt:MinimumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2019-09-300000875357us-gaap:FairValueInputsLevel3Membersrt:MaximumMemberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2019-09-300000875357us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:FairValueNonaccruingLoansMember2019-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMemberbokf:MarketabilityadjustmentsoffappraisedvalueDomainbokf:ValuationTechniqueAppraisedValueasAdjustedMember2019-09-300000875357srt:MinimumMemberus-gaap:FairValueInputsLevel3Memberbokf:FairValueRealEstateAndOtherRepossessedAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:FairValueRealEstateAndOtherRepossessedAssetsMembersrt:MaximumMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:FairValueRealEstateAndOtherRepossessedAssetsMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-09-300000875357us-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-300000875357us-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-300000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-300000875357us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel1Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-09-300000875357us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberbokf:OtherTradingSecuritiesMember2020-09-300000875357bokf:OtherTradingSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel1Memberbokf:OtherTradingSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberbokf:OtherTradingSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberbokf:OtherTradingSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:USTreasurySecuritiesMember2020-09-300000875357us-gaap:USTreasurySecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasurySecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:USTreasurySecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-300000875357us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:CommercialPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:CommercialPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2020-09-300000875357us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2020-09-300000875357us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2020-09-300000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberbokf:PaycheckProtectionProgramMember2020-09-300000875357us-gaap:EstimateOfFairValueFairValueDisclosureMemberbokf:PaycheckProtectionProgramMember2020-09-300000875357us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberbokf:PaycheckProtectionProgramMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberbokf:PaycheckProtectionProgramMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberbokf:PaycheckProtectionProgramMember2020-09-300000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberbokf:LoanstoindividualsMember2020-09-300000875357us-gaap:EstimateOfFairValueFairValueDisclosureMemberbokf:LoanstoindividualsMember2020-09-300000875357us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberbokf:LoanstoindividualsMember2020-09-300000875357us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberbokf:LoanstoindividualsMember2020-09-300000875357us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberbokf:LoanstoindividualsMember2020-09-300000875357us-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310000875357us-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310000875357us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel1Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000875357us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:AssetBackedSecuritiesMember2019-12-310000875357us-gaap:AssetBackedSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberbokf:OtherTradingSecuritiesMember2019-12-310000875357bokf:OtherTradingSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel1Memberbokf:OtherTradingSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberbokf:OtherTradingSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberbokf:OtherTradingSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:USTreasurySecuritiesMember2019-12-310000875357us-gaap:USTreasurySecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasurySecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:USTreasurySecuritiesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310000875357us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000875357us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000875357us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:CommercialPortfolioSegmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:CommercialPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:CommercialPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:ResidentialPortfolioSegmentMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:ResidentialPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:ConsumerPortfolioSegmentMember2019-12-310000875357us-gaap:ConsumerPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel1Memberus-gaap:ConsumerPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel2Memberus-gaap:ConsumerPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000875357us-gaap:FairValueInputsLevel3Memberus-gaap:ConsumerPortfolioSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-31

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-Q
(Mark One) 
 QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended September 30, 2020
OR
 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 
For the transition period from _____________ to ______________                 

Commission File No. 0-19341

BOK FINANCIAL CORP
(Exact name of registrant as specified in its charter) 
Oklahoma 73-1373454
(State or other jurisdiction
of Incorporation or Organization)
 (IRS Employer
Identification No.)
  
Bank of Oklahoma Tower  
Boston Avenue at Second Street  
Tulsa,Oklahoma 74192
(Address of Principal Executive Offices) (Zip Code)
 
(918) 588-6000
(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.       Yes  ý  No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).Yes  ý  No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer.  See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act.  (Check one):

Large accelerated filer  ý                                               Accelerated filer           ¨            Non-accelerated filer   ¨ (Do not check if a smaller reporting company)     Smaller reporting company
                                    Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).   Yes    No  ý

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date: 70,305,833 shares of common stock ($.00006 par value) as of September 30, 2020.

BOK Financial Corporation
Form 10-Q
Quarter Ended September 30, 2020

Index
Part I.  Financial Information
Management’s Discussion and Analysis (Item 2)        
Market Risk (Item 3)                                                                                              
Controls and Procedures (Item 4)
Consolidated Financial Statements – Unaudited (Item 1)
Quarterly Financial Summary – Unaudited (Item 2)
Quarterly Earnings Trend – Unaudited
  
Part II.  Other Information
Item 1.  Legal Proceedings
Item 1A. Risk Factors
Item 2.  Unregistered Sales of Equity Securities and Use of Proceeds
Item 6.  Exhibits
Signatures



Management’s Discussion and Analysis of Financial Condition and Results of Operations
Performance Summary

BOK Financial Corporation (“the Company”) reported net income of $154.0 million or $2.19 per diluted share for the third quarter of 2020. Net income was $142.2 million or $2.00 per diluted share for the third quarter of 2019 and $64.7 million or $0.92 per diluted share for the second quarter of 2020. No provision for expected credit losses was necessary in the third quarter of 2020. The Company recorded a pre-tax provision for expected credit losses of $135.3 million in the second quarter of 2020. A pre-tax provision for incurred credit losses of $12.0 million was recorded in the third quarter of 2019.

Highlights of the third quarter of 2020 included:

Net interest revenue totaled $271.8 million, a decrease of $7.3 million compared to the third quarter of 2019. Net interest margin was 2.81 percent for the third