Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Stock Options [Member] Employee Stock Option [Member] Non-vested Common Stock [Member] Restricted Stock [Member] Share-based Compensation Arrangements by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangements by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangements by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract] Number of Options [Abstract] [Abstract] Number of Options [Abstract] [Abstract] Number of options outstanding, Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options shares vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Share-based Compensation Arrangements by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Options outstanding, weighted average exercise price, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options vested, weighted average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Options outstanding, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options vested, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Options exercised, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Weighted average remaining contractual life of options outstanding (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual life of options vested (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Non-vested common shares awarded, beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Non-vested shares that were granted during the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Non-vested shares that vested during period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Non-vested shares that forfeited during period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Non-vested common shares awarded, end of period (in shares) Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted Average Grant Date Fair Value, Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value, Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value non-vested stock awards forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Share-based Compensation Costs, Including Costs That May Be Recognized As Future Expense [Abstract] Share-based Compensation Costs, Inclduing Costs That May Be Recognized As Future Expense [Abstract] Compensation Expense share-based compensation, including costs that may be recognized as future expense Share-based Compensation Expense Recognized Allocated Share-based Compensation Expense Unrecognized compensation cost of unvested awards, for future periods Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Unrecognized compensation cost of unvested awards, Amount to be expensed in 2019 Employee Service Share-based Compensation, Nonvested Awards, Compensation Costs Not Yet Recognized, Amount to be Expensed in Next Twelve Months Represents the unrecognized cost of unvested share-based compensation awards to be recognized in expense in the net twelve months following the balance sheet date. Unrecognized compensation cost of unvested awards, Amount to be expensed in 2020 Employee Service Share-based Compensation, Nonvested Awards, Compensation Costs Not Yet Recognized, Amount to be Expensed in Year Two Represents the unrecognized cost of unvested share-based compensation awards to be recognized in expense in the second year following the balance sheet date. Unrecognized compensation cost of unvested awards, Amount to be expensed in 2021 Employee Service Share-based Compensation, Nonvested Awards, Compensation Costs Not Yet Recognized, Amount to be Expensed in Year Three Represents the unrecognized cost of unvested share-based compensation awards to be recognized in expense in year three following the balance sheet date. Total shares awarded under executive incentive plan (in shares) Total shares awarded under executive incentive plan Total shares awarded under executive incentive plan, subject to downward revision by board of directors Number of shares with required performance obligations Number of shares with required performance obligations Number of shares with required performance obligations Property, Plant and Equipment [Abstract] Premises and Equipment [Table Text Block] Property, Plant and Equipment [Table Text Block] Loans [Abstract] Loans [Abstract] Loans, Number of Days Past Due for a Non-Risk Graded Loan to be Placed on Nonaccruing Status Loans, Number of Days Past Due for a Non-Risk Graded Loan to be Placed on Nonaccruing Status Represents the number of days past due a non-risk graded loan has to be in order to be placed on nonaccruing status. Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Placed on Nonaccruing Status Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Placed on Nonaccruing Status The number of days following notification of a borrowers Chapter 7 bankruptcy that a non-risk graded loan is placed on nonaccruing status. Loans, Minimum Number of Days After Which Past Due Non-Risk Graded Loans Are Charged Off Minimum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off Minimum number of days after which past due non-risk graded loans are charged off Loans, Maximum Number of Days After Which Past Due Non-Risk Graded Loans Are Charged Off Max No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off Maximum number of days after which past due non-risk graded loans are charged off Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Charged Off Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Charged Off Represents the number of days after notification of Chapter 7 bankruptcy for a non-risk graded loan to be charged off Condensed Financial Information Disclosure [Abstract] Condensed Balance Sheet [Table Text Block] Condensed Balance Sheet [Table Text Block] Condensed Income Statement [Table Text Block] Condensed Income Statement [Table Text Block] Condensed Cash Flow Statement [Table Text Block] Condensed Cash Flow Statement [Table Text Block] Deposits [Abstract] Interest Expense on Deposits Disclosure [Table Text Block] Interest Income and Interest Expense Disclosure [Table Text Block] Statement of Comprehensive Income [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income (loss), before income taxes: [Abstract] Other Comprehensive Income (Loss), before Tax [Abstract] Net change in unrealized gain (loss) Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Reclassification adjustments included in earnings: [Abstract] Reclassification Adjustments Included in Earnings [Abstract] Reclassification Adjustments Included in Earnings [Abstract] Interest revenue, Investment securities, Taxable securities Amortization Of Transfer Of Net Unrealized Gain On Available For Sale Securities To Investment Securities Represents amortization of net unrealized gain retained in AOCI upon transfer of certain residential mortgage-backed securities from available for sale to held to maturity. Such amounts are amortized over the estimated life of the security as an adjustment to yield, offsetting the related amortization of the premium or accretion of the discount on the transferred securities. Loss (gain) on available for sale securities, net Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Other comprehensive loss, before income taxes Other Comprehensive Income (Loss), before Tax Federal and state income taxes Other Comprehensive Income (Loss), Tax Other comprehensive loss, net of income taxes Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to BOK Financial Corp. shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Premises and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Premises and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land Land [Member] Buildings and improvements Building and Building Improvements [Member] Software Computer Software, Intangible Asset [Member] Furniture and equipment Furniture and Fixtures [Member] Construction in progress Asset under Construction [Member] Premises and Equipment [Line Items] Property, Plant and Equipment [Line Items] Premises and equipment Property, Plant and Equipment, Gross Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Premises and equipment, net of accumulated depreciation Property, Plant and Equipment, Net Depreciation Expense Depreciation Derivative Instrument Detail [Abstract] Trading Activities, Gain and Losses, by Type, by Income Statement Location [Table] Trading Activities, Gain and Losses, by Type, by Income Statement Location [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] To-be-announced residential mortgage-backed securities [Member] TBA Residential Mortgage-Backed Securities [Member] To-be-announed residential mortgage-backed securities [Member] Interest rate swaps [Member] Interest Rate Swap [Member] Energy contracts [Member] Energy Related Derivative [Member] Agricultural contracts [Member] Agricultural Contracts [Member] Trading in a derivative instrument whose primary underlying risk is tied to agricultural commodity prices. Foreign exchange contracts [Member] Foreign Exchange Contract [Member] Equity option contracts [Member] Equity Swap [Member] Total customer risk management programs [Member] Customer Risk Management Programs [Member] Represents total derivative contracts in customer risk management programs. Internal risk management programs [Member] Internal Risk Management Programs [Member] Represents program to manage interest rate sensitivity, as part of its economic hedge of the changes in the fair value of mortgage servicing rights and as an economic hedge of trading securities. Trading Activity, Gains and Losses, Net [Line Items] Trading Activity, Gains and Losses, Net [Line Items] Brokerage and Trading Revenue Trading Gain (Loss) Gain (Loss) on Derivatives, Net Derivative, Gain (Loss) on Derivative, Net Debt Disclosure [Abstract] Schedule of Other Borrowings [Table] Schedule of Long-term Debt Instruments [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Parent Company [Member] Parent Company [Member] Subsidiaries [Member] Subsidiaries [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] BOKF, NA [Member] BOKF, NA [Member] BOKF, NA [Member] BOK Financial Securities, Inc. [Member] BOK Financial Securities, Inc. [Member] BOK Financial Securities, Inc. [Member] Other Borrowings, Type [Axis] Long-term Debt, Type [Axis] Other Borrowings, Type [Domain] Long-term Debt, Type [Domain] Funds purchased [Member] Federal Funds Purchased [Member] Repurchase agreements [Member] Securities Sold under Agreements to Repurchase [Member] Other Borrowings [Member] Other Borrowings [Member] Other Borrowings [Member] Federal Home Loan Bank advances [Member] Federal Home Loan Bank Advances [Member] GNMA repurchase liability [Member] GNMA Repurchase Liability [Member] -- None. No documentation exists for this element. -- Other [Member] Notes Payable, Other Payables [Member] Subordinated debentures [Member] Subordinated Debt [Member] Subordinated debentures, 2016 issuance [Member] Subordinated Debentures, 2016 Issuance [Member] Subordinated Debentures, 2016 Issuance [Member] Subordinated debentures-acquired, 2015 Issuance [Member] Subordinated debentures-acquired, 2015 issuance [Member] Subordinated debentures - acquired, 2015 issuance [Member] Junior subordinated debentures-acquired, 2003 issuance [Member] Junior subordinated debentures-acquired, 2003 issuance [Member] [Domain] Junior subordinated debentures-acquired, 2003 issuance [Member] Junior subordinated debentures-acquired, 2004 issuance [Member] Junior subordinated debentures-acquired, 2004 issuance [Member] Junior subordinated debentures-acquired, 2004 issuance [Member] Junior subordinated debentures-acquired, 2005 issuance [Member] Junior subordinated debentures-acquired, 2005 issuance [Member] Junior subordinated debentures-acquired, 2005 issuance [Member] Trust preferred debt [Member] Trust Preferred Securities Subject to Mandatory Redemption [Member] Trust preferred debt, 2003 issuance [Member] Trust preferred debt, 2003 issuance [Member] Trust preferred debt, 2003 issuance [Member] Trust preferred debt, 2006 issuance [Member] Trust preferred debt, 2006 issuance [Member] Trust preferred debt, 2006 issuance [Member] Subordinated debentures, 2007 issuance [Member] Subordinated Debentures, 2007 Issuance [Member] Subordinated Debentures, 2007 Issuance [Member] Other Borrowings [Line Items] Debt Instrument [Line Items] Balance Long-term Debt Rate Debt, Weighted Average Interest Rate Average Balance Debt, average balance Average balance of debt instrument Rate Debt Instrument, Interest Rate During Period Maximum Outstanding At Any Month End Debt Instrument Maximum Month End Outstanding Amount Maximum month-end amount borrowed under the debt instrument during the period. Other borrowings, Maturities [Abstract] Long-term Debt, Fiscal Year Maturity [Abstract] 2019 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two 2021 Long-term Debt, Maturities, Repayments of Principal in Year Three 2022 Long-term Debt, Maturities, Repayments of Principal in Year Four 2023 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Other borrowings, Other Disclosures [Abstract] Long-term Debt, Other Disclosures [Abstract] Number of days to maturity, minimum Number of days to maturity, minimum Number of days to maturity of other borrowings, minimum Number of days to maturity, maximum Number of days to maturity, maximum Number of days to maturity, maximum Federal Home Loan Banks, Letters of credit issued to secure public funds Federal Home Loan Banks, Letters of Credit Issued to Secure Public Funds Letters of credit issued by Federal Home Loan Banks to ecusre public funds. Unused credit available pursuant to the FHLB's collateral policies Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds Amount of debt issuance Debt Instrument, Face Amount Maturity date Debt Instrument, Maturity Date Interest rate description Debt Instrument, Interest Rate Terms Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Call Date, Earliest Debt Instrument, Call Date, Earliest Disclosure of Repurchase Agreements [Abstract] Disclosure of Repurchase Agreements [Abstract] Schedule of Assets Sold under Agreements to Repurchase [Table] Schedule of Assets Sold under Agreements to Repurchase [Table] Assets Sold under Agreements to Repurchase [Axis] Securities or Other Assets Sold under Agreements to Repurchase [Axis] Assets Sold under Agreements to Repurchase, Type [Domain] Assets Sold under Agreements to Repurchase, Type [Domain] U.S. government agency mortgage-backed securities [Member] Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Assets Sold under Agreements to Repurchase, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Assets Sold under Agreements to Repurchase, Maturity Period [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Overnight [Member] Maturity Overnight [Member] Long-term [Member] Maturity Greater than 90 Days [Member] Assets Sold under Agreements to Repurchase [Line Items] Assets Sold under Agreements to Repurchase [Line Items] Amortized Cost Assets Sold under Agreements to Repurchase, Carrying Amount Fair Value Assets Sold under Agreements to Repurchase, Market Value Repurchase Liability Assets Sold under Agreements to Repurchase, Repurchase Liability Average Rate (in hundredths) Assets Sold under Agreements to Repurchase, Interest Rate Commitments and Contingencies Disclosure [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Private equity funds [Member] Private Equity Funds Variable Interest Entities [Member] Private Equity Funds Variable Interest Entities Tax credit entities [Member] Tax Credit Variable Interest Entities [Member] Tax Credit Variable Interest Entities Other [Member] Other Variable Interest Entities [Member] Other Variable Interest Entities Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Loans [Member] Loans Receivable [Member] Other Assets [Member] Other Assets [Member] Other Liabilities [Member] Other Liabilities [Member] Other Borrowings [Member] Borrowings [Member] Non-Controlling Interests [Member] Noncontrolling Interest [Member] BOKF Equity, LLC [Member] BOKF Equity, LLC [Member] An indirect, wholly owned subsidiary of the entity that is the general partner of consolidated private equity funds. Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Number of Private Equity Funds of which the Entity is a General Partner Number of Private Equity Funds of which the Entity is a General Partner The number of consolidated private equity mutual funds that The Entity is a general partner of. Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net Share-based Compensation, Stock Options, Activity [Table Text Block] Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Nonvested Share Activity [Table Text Block] Schedule of Nonvested Share Activity [Table Text Block] Software and Software Development Costs [Member] Software and Software Development Costs [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Property, Plant and Equipment, Useful Life Property, Plant and Equipment, Useful Life Retirement Benefits [Abstract] Change in benefit obligation, plan assets funded status and net periodic pension cost (benefit) [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Valuation assumptions used [Table Text Block] Schedule of Assumptions Used [Table Text Block] Expected future benefit payments [Table Text Block] Schedule of Expected Benefit Payments [Table Text Block] Revenue from Contract with Customer [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments [Member] Operating Segments [Member] Funds Management and Other [Member] Corporate, Non-Segment [Member] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Commercial [Member] Commercial [Member] Business segment-commercial customers. Consumer [Member] Consumer [Member] Business segment-consumer customers. Wealth Management [Member] Wealth Management [Member] Business segment-wealth management consulting customers. Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Fees and commissions revenue [Member] Fees and commissions revenue [Member] Fees and commissions revenue [Member] Brokerage and trading revenue [Member] Brokerage and trading revenue [Member] Brokerage and trading revenue [Member] Trading Revenue [Member] Gain loss on trading [Member] Gain loss on trading [Member] Customer hedging revenue [Member] Customer hedging revenue [Member] Customer hedging revenue [Member] Retail brokerage revenue [Member] Retail brokerage revenue [Member] Retail brokerage revenue [Member] Investment banking revenue [Member] Investment banking revenue [Member] Investment banking revenue [Member] Transaction card revenue [Member] Transaction card revenue [Member] Transaction card revenue [Member] TransFund EFT network revenue [Member] TransFund EFT network revenue [Member] TransFund EFT network revenue [Member] Merchant services revenue [Member] Merchant services revenue [Member] Merchant services revenue [Member] Fiduciary and asset management revenue [Member] Fiduciary and Trust [Member] Personal trust revenue [Member] Personal trust revenue [Member] Personal trust revenue [Member] Corporate trust revenue [Member] Corporate trust revenue [Member] Corporate trust revenue [Member] Institutional trust & retirement plan services revenue [Member] Institutional trust & retirement plan services revenue [Member] Institutional trust & retirement plan services revenue [Member] Investment management services and other [Member] Investment management services and other [Member] Investment management services and other [Member] Deposit service charges and fees [Member] Deposit Account [Member] Commercial account service charge revenue [Member] Commercial account service charge revenue [Member] Commercial account service charge revenue [Member] Overdraft fee revenue [Member] Overdraft fee revenue [Member] Overdraft fee revenue [Member] Check card fee revenue [Member] Check card fee revenue [Member] Check card fee revenue [Member] Automated service charge and other deposit fee revenue [Member] Automated service charge and other deposit fee revenue [Member] Automated service charge and other deposit fee revenue [Member] Mortgage banking revenue [Member] Mortgage Banking [Member] Mortgage production revenue [Member] Mortgage production revenue [Member] Mortgage production revenue [Member] Mortgage servicing revenue [Member] Mortgage servicing revenue [Member] Mortgage servicing revenue [Member] Other revenue [Member] Financial Service, Other [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Fess and commissions revenue Total fees and commissions Total fees and commissions earned from providing services such as maintaining: depositor accounts; fiduciary and trust; brokerage and underwriting; mortgage; transaction cards; and other revenue such as bank owned life insurance. Fees and commissions revenue not from contracts with customers Fees and commission revenue not from contracts with customers Represents fees and commissions revenue not in the scope of ASC 606, Revenue from Contracts with Customers, related to financial instruments or from contractual rights and obligations within the scope of other applicable accounting guidance. Fees and commissions revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Core deposits premiums [Member] Core Deposits [Member] Other identifiable intangible assets [Member] Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-lived intangible assets, gross Finite-Lived Intangible Assets, Gross Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Finite-lived intangible assets, net Intangible Assets, Net (Excluding Goodwill) Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2019 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Schedule of Goodwill [Table] Schedule of Goodwill [Table] Funds Management and Other [Member] Funds Management and Other [Member] An operating segment that manages the overall liquidity needs and interest rate risk activities of the company from which it may earn revenues and incur expenses. Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, Beginning Balance Goodwill Goodwill recognized during period Goodwill, Acquired During Period Goodwill, decrease due to sale of consolidated merchant banking investments Goodwill, Written off Related to Sale of Business Unit Adjustment Goodwill, Purchase Accounting Adjustments Goodwill, Ending Balance Commitments and Contingent Liabilities [Text Block] Commitments and Contingencies Disclosure [Text Block] Segment Reporting [Abstract] Segments Reporting Information [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Segment Reporting Information [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] Net interest and dividend revenue from external sources NIR (expense) from external sources Amount of interest revenue, primarily from loans and securities net of interest expense (cost of borrowed funds accounted for as interest) from external sources. Net interest revenue (expense) from internal sources NIR (expense) from internal sources Amount of interest revenue earned or paid on funds loaned to or borrowed from the funds management unit net of interest expense (cost of borrowed funds accounted for as interest) from internal sources. Net interest and dividend revenue Interest Income (Expense), Net Provision for credit losses Provision for Loan, Lease, and Other Losses Net interest and dividend revenue after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Other operating revenue Noninterest Income Other operating expense Noninterest Expense Net direct contribution Net direct contribution Represents net direct contribution of segments prior to corporate expense allocations. Gain (loss) on financial instruments, net Gain (Loss) on Financial Instruments, Net Represents gain (loss) on financial instruments, net, used for segment reporting purposes on a summary basis. Includes those gains and losses from derivative contracts, fair value option securities and available for sale securities. Also includes in other-than-temporary impairment losses recognized in earnings. Change in fair value of mortgage servicing rights Segment Reporting, Change in Fair Value of Mortgage Servicing Rights Represents the change in the fair value of mortgage servicing rights used for segment reporting purposes. Gain (loss) on repossessed assets, net Gain (Loss) on Sale of Assets and Asset Impairment Charges Corporate expense allocations Corporate Expense Allocations Represent allocation of corporate expenses to segments Net income before taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Federal and state income taxes Income Tax Expense (Benefit) Net income (loss) attributable to non-controlling interests Net income attributable to BOK Financial Corp. shareholders Net Income (Loss) Attributable to Parent Average assets Average Assets for Reporting Period Amount of average assets attributed to the reportable segment for the reporting period. Earnings Per Share [Abstract] Earnings Per Share [Text Block] Earnings Per Share [Text Block] Mortgage Banking [Abstract] Mortgage Banking Activities [Text Block] Mortgage Banking Activities [Text Block] Mortgage Banking Activities [Text Block] Fair Value Measurement, Measured On Non-Recurring Basis, Significant Unobservable Inputs, Quantitative Information [Abstract] Fair Value Measurement, Measured On Non-Recurring Basis, Significant Unobservable Inputs, Quantitative Information [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Weighted Average [Member] Weighted Average [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Discounted Cash Flow [Member] Valuation Technique, Discounted Cash Flow [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Measurements, Nonrecurring [Member] Asset Class [Axis] Asset Class [Axis] Fair Value by Asset Class [Domain] Asset Class [Domain] Impaired Loans [Member] Fair Value, Impaired Loans [Member] Fair Value, Impaired Loans [Member] Real estate and other repossessed assets [Member] Fair Value, Real estate and other repossessed assets [Member] Fair Value, Real estate and other repossessed assets [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Management knowledge of Industry [Member] Management knowledge of Industry [Member] Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs Recoverable oil and gas reserves, forward-looking commodity prices, and estimated operating costs [Member] Recoverable oil and gas reserves, forward-looking commodity prices, and estimated operating costs [Member] Recoverable oil and gas reserves, forward-looking commodity prices, and estimated operating costs [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance Assets, Fair Value Disclosure Assets, Fair Value Disclosure Debt Securities, Held-to-maturity [Abstract] Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-maturity [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Fixed maturity securities [Member] Fixed Income Securities [Member] Municipal and other tax-exempt securities [Member] US States and Political Subdivisions Debt Securities [Member] Other debt securities [Member] Other Debt Obligations [Member] U.S. government agency residential mortgage-backed securities [Member] Schedule of Investment (Held-to-Maturity) Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Investment securities Debt Securities, Held-to-maturity Investment Securities, Fair Value Debt Securities, Held-to-maturity, Fair Value Investment Securities, Gross Unrealized Gain Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Investment Securities, Gross Unrealized Loss Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Investment Securities, Debt Maturities [Abstract] Debt Securities, Held-to-maturity, Maturity [Abstract] Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract] Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Investment Securities, Debt Maturities, Single Maturity Date, Carrying Value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying value Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost Investment Securities, Debt Maturities, Amortized Cost Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] Debt Securities, Held-to-maturity, Maturity, Fair Value, Rolling Maturity [Abstract] Investment Securities, Debt Maturities, Less than One Year, Fair Value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Investment Securities, Debt Maturities, One to Five Years, Fair Value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Investment Securities, Debt Maturities, Six to Ten Years, Fair Value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Investment Securities, Debt Maturities, Over Ten Years, Fair Value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Investment Securities, Debt Maturities, Single Maturity Date, Fair value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value Investment Securities, Debt Maturities, without Single Maturity Date, Fair value Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value Investment Securities, Debt Maturities, Nominal Yield [Abstract] Held-to-maturity Securities, Debt Maturities, Nominal Yield [Abstract] Held-to-maturity Securities, Debt Maturities, Nominal Yield [Abstract] Investment Securities, Debt Maturities, Less Than One Year, Nominal Yield Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Nominal Yield Nominal yield on the securities maturing in the next rolling twelve months following the latest balance sheet presented, as calculated from its issuance value or purchase price. Investment Securities, Debt Maturities, One to Five Years, Nominal Yield Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Nominal Yield Nominal yield on the securities maturing in the second rolling twelve months through fifth rolling twelve months following the latest balance sheet presented. as calculated from its issuance value or purchase price. Investment Securities, Debt Maturities, Six to Ten Years, Nominal Yield Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Nominal Yield Nominal yield on the securities maturing in sixth through tenth rolling twelve months following the latest balance sheet presented, as calculated from its issuance value or purchase price. Investment Securities, Debt Maturities, Over Ten Years, Nominal Yield Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Nominal Yield Nominal yield on the securities maturing after the tenth rolling twelve months following the latest balance sheet presented, as calculated from its issuance value or purchase price. Investment Securities, Debt Maturities, Nominal Yield Held-to-maturity Securities, Debt Maturities, Nominal Yield Total nominal yield for Held-to-maturity Securities over varying maturity dates Investment Securities, Debt Maturities, Weighted Average Maturity Held-to-maturity Securities, Debt Maturities, Weighted Average Maturity Represents the weighted average maturity (weighted by amount of the security) of all securities in this investment type. Investment Securities, Debt Maturities, Effective tax rate for nominal yield calculation Held-to-Maturity Securities, Debt Maturities, Effective tax rate for nominal yield calculation Effective tax rate for nominal yield calculation for investment (held-to-maturity) securities. Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities Held-to-maturity Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities The calculated weighted-average expected life of mortgage-backed securities held to maturity based on prepayment assumptions as of the balance sheet date. Investment Securities, Continuous Unrealized Loss Position [Abstract] Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract] Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Investment Securities, Continuous Unrealized Loss Position, Fair Value Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract] Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss Interest expense on deposits [Abstract] Interest Expense, Deposits [Abstract] Transaction deposits Interest Expense, Demand Deposit Accounts Savings Interest Expense, Savings Deposits Time Deposit, Interest Expense [Abstract] Interest Expense, Time Deposits [Abstract] Certificates of deposits under $100,000 Interest Expense, Time Deposits, Less than $100,000 Certificates of deposits $100,000 and over Interest Expense, Time Deposits, $100,000 or More Other time deposits Interest Expense on Other time deposits Interest expense incurred on time deposits, other than certificates of deposits. Total time Interest Expense, Time Deposits Total Interest Expense, Deposits Time Deposit Information [Abstract] Time Deposit Information [Abstract] Time Deposit Information [Abstract] Time deposits in denomination of $250,000 or more Time Deposits, at or Above FDIC Insurance Limit Time Deposit Maturities [Abstract] Time Deposits, Fiscal Year Maturity [Abstract] 2019 Time Deposit Maturities, Next Twelve Months 2020 Time Deposit Maturities, Year Two 2021 Time Deposit Maturities, Year Three 2022 Time Deposit Maturities, Year Four 2023 Time Deposit Maturities, Year Five Thereafter Time Deposit Maturities, after Year Five Other Deposits Information [Abstract] Other Deposits Information [Abstract] 83ab67a7-0145-6085-1261-f4be52823edb Overdrawn customer transaction deposits reclassified as loan balances Deposit Liabilities Reclassified as Loans Receivable Debt Securities, Available-for-sale [Abstract] Schedule of Available for Sale Securities [Table] Schedule of Available-for-sale Securities [Table] U.S. Treasury [Member] US Treasury Securities [Member] Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities [Member] Privately issued residential mortgage-backed securities [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member] Commercial Mortgage Backed Securities [Member] Perpetual preferred stock [Member] Preferred Stock [Member] Equity securities and mutual funds [Member] Equity Securities And Mutual Funds [Member] This category includes information about ownership interests or the right to acquire ownership interests in corporations and mutual funds. Investment Issuer [Axis] Investment Issuer [Axis] Investment Issuer [Domain] Investment Issuer [Domain] FNMA [Member] Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] FHLMC [Member] Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] GNMA [Member] Government National Mortgage Association Certificates and Obligations (GNMA) [Member] Available for Sale Securities [Line Items] Debt Securities, Available-for-sale [Line Items] Available for sale securities, Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Available for sale securities, Fair Value Debt Securities, Available-for-sale Available for sale securities, Gross Unrealized Gain Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Available for sale securities, Gross Unrealized Loss Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Available for sale securities, OTTI Debt Securities, Available-for-Sale Securities, Other Than Temporary Impairments The unrealized loss as of the balance sheet date that remains in Accumulated Other Comprehensive Income subsequent to an other-than-temporary impairment loss being recognized in earnings. Available for sale securities, Pledged as Collateral, Fair Value Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value Available for Sale Securities, Debt Maturities [Abstract] Available-for-sale Securities, Debt Maturities [Abstract] Available for Sale Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract] Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract] Available for Sale Securities, Debt Maturities, Less than One Year, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Available for Sale Securities, Debt Maturities, One to Five Years, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost Available for Sale Securities, Debt Maturities, Six to Ten Years, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost Available for Sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Available for Sale Securities, Maturity, Allocated and Single Maturity Date, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Available for Sale Securities, Maturity, without Single Maturity Date, Amortized Cost Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Available for Sale Securities, Maturity, Fair Value, Rolling Maturity [Abstract] Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] Available for Sale Securities, Debt Maturities, Less Than One Year, Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Available for Sale Securities, Debt Maturities, One to Five Years, Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Available for Sale Securities, Debt Maturities, Six to Ten Years, Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Available for Sale Securities, Debt Maturities, Over Ten Years, Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Available for Sale Securities, Debt Maturities, Single Maturity Date, Fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Available for Sale Securities, Debt Maturities, without Single Maturity Date, Fair value Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Available for Sale Securities, Debt Maturities, Nominal Yield [Abstract] Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract] -- None. No documentation exists for this element. -- Available for Sale Securities, Debt Maturities, Less than one year, Nominal Yield Debt Securities, Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Nominal Yield Nominal yield of available-for-sale securities maturing in the next rolling twelve months following the balance sheet presented. Available for Sale Securities, Debt Maturities, One to five years, Nominal Yield Debt Securities, Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Nominal Yield Represents the nominal yield of available-for-sale securities maturing in the second rolling twelve months through the fifth rolling twelve months following the balance sheet date presented. Available for Sale Securities, Debt Maturities, Six to ten years, Nominal Yield Debt Securities, Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Nominal Yield Represents the nominal yield of available-for-sale securities maturing in the sixth rolling twelve months through the tenth rolling twelve months following the balance sheet presented Available for Sale Securities, Debt Maturities, Over ten years, Nominal Yield Debt Securities, Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Nominal Yield Represents the nominal yield of available-for-sale securities maturing after tenth rolling twevle months following the balance sheet presented Available for Sale Securities, Debt Maturities, Nominal Yield Debt Securities, Available-for-sale Securities, Debt Maturities, Nominal Yield Represents the nominal yield of available-for sale securities as of the balance sheet date. Available for Sale Securities, Debt Maturities, Weighted Average Maturity Debt Securities, Available-for-sale Securities, Debt Maturities, Weighted Average Maturity Represents the the contractual weighted average maturity (weighted by amount of the security) for this portion of the available-for-sale securities portfolio. Available for Sale Securities, Debt Maturities, Effective tax rate for nominal yield calculation Debt Securities, Available-for-sale Securities, Debt Maturities, Effective tax rate for nominal yield calculation Effective tax rate for nominal yield calculation for available for sale securities. Available for Sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities Debt Securities, Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities The calculated weighted-average expected life of mortgage-backed securities based on prepayment assumptions as of the balance sheet date. Available for Sale Securities, Debt Maturities, Number of days for interest rates to reset Debt Securities, Available-for-sale Securities, Debt Maturities, Number of days for interest rates to reset Number of days for interest rates to reset on variable rate municipal or other debt securities. Available for Sale Securities, Realized Gain (Loss) [Abstract] Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] Proceeds from sales of available for sale securities Proceeds from Sale of Debt Securities, Available-for-sale Available for Sale Securities, Gross realized gains Debt Securities, Available-for-sale, Realized Gain Available for Sale Securities, Gross realized losses Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment Available for Sale Securities, Related federal and state income tax expense Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Available for Sale Securities, Continuous Unrealized Loss Position [Abstract] Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Available for Sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] Available for Sale Securities, Unrealized Loss Position, Number of Positions Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Available for Sale Securities, Unrealized Loss Position [Abstract] Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] Available for Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Available for Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Available for Sale Securities, Unrealized Loss Position Debt Securities, Available-for-sale, Unrealized Loss Position Available for Sale Securities, Unrealized Loss Position, Accumulated Loss [Abstract] Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Available for Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Available for Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available for Sale Securities, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Other than Temporary Impairment Losses, Investments, Available for Sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures [Abstract] Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale [Abstract] Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net [Abstract] Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings [Abstract] Other-than-temporary Impairment Loss, Available for Sale Securities, Recognized in Earnings Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings Other than Temporary Impairment, Credit Losses Recognized in Earnings, Cumulative Credit Losses on Debt Securities Held Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Loans Receivable, Net [Abstract] Schedule of the Loans by Portfolio Segment [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Rollforward of Allowance For Loan Losses And Accrual for Off-Balnace Sheet Credit Losses [Table Text Block] Allowance for Credit Losses on Financing Receivables [Table Text Block] Schedule of Credit Quality Indicators [Table Text Block] Financing Receivable Credit Quality Indicators [Table Text Block] Summary of Impaired Loans [Table Text Block] Impaired Financing Receivables [Table Text Block] Summary of Loans by Aging Status [Table Text Block] Past Due Financing Receivables [Table Text Block] Condensed Income Statement [Table] Condensed Income Statement [Table] Dividends, interest and fees received from bank susidiaries [Member] Dividends, interest and fees received from bank susidiaries [Member] Dividends, interest and fees received from bank susidiaries [Member] Diviidends, interest and fees received from non-bank subsidiaries [Member] Diviidends, interest and fees received from non-bank subsidiaries [Member] Dividends, interest and fees received from non-bank subsidiaries [Member] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Total revenue Revenues Interest expense Interest Expense Other operating expense Total expense Operating Expenses Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries Net income before taxes and loss on equity securities not held for trading, net Net income before taxes and loss on equity securities not held for trading, net Other losses, net Gain (Loss) on Disposition of Assets Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries Income before taxes and equity in undistributed income of subsidiaries Income before taxes and equity in undistributed income of subsidiaries Net income before equity in undistributed income of subsidiaries Income before equity in undistributed earnings of subsidiaries Income before equity in undistributed earnings of subsidiaries Equity in undistributed income of bank subsidiaries Equity in undistributed income of bank subsidiaries Represents the equity in undistributed income of consolidated bank subsidiaries by the parent for parent-only financial statement purposes. Equity in undistributed income of non-bank subsidiaries Equity in undistributed income of non-bank subsidiaries Represents equity in undistributed income of consolidated non-bank subsidiaries by parent for parent-only financial statement purposes. Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table Text Block] Statement of Financial Position [Abstract] Assets [Abstract] Assets [Abstract] Investment securities [Abstract] Debt Securities, Held-to-maturity, Parenthetical Disclosure [Abstract] Investment securities, fair value Real estate and other repossessed assets, allowance Real Estate Owned, Valuation Allowance Shareholders' equity: [Abstract] Stockholders' Equity Attributable to Parent [Abstract] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Treasury stock, shares at cost (in shares) Treasury Stock, Shares Fair Value Disclosures [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Measurement Frequency [Axis] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Available for sale securities [Member] Available-for-sale Securities [Member] Residential mortgage loans held for sale [Member] Residential Mortgage Loans Held for Sale [Member] Represents financial statement line item Residential Mortgage Loans Held for Sale Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Mortgage banking revenue [Member] Mortgage banking revenue [Member] Represents Mortgage banking revenue income statement line item. Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance at beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Transfers to Level 3 from Level 2 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Purchases and capital calls Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Redemptions and distributions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Proceeds from sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Gain (loss) recognized in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Other comprehensive income (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Balance at end of period Derivative Contracts [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivative Instruments, Gain (Loss) in Statement of Earnings [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Components of Residential Mortgage Loans Held For Sale [Table Text Block] Residential Mortgage Loans Held For Sale [Table Text Block] Tabular disclosure of mortgage loans to individuals not classified as held for investment but are held-for-sale. Mortgage Banking Revenue [Table Text Block] Mortgage Banking Revenue [Table Text Block] Mortgage Banking Revenue [Table Text Block] Summary of Mortgage Servicing Rights [Table Text Block] Summary of Mortgage Servicing Rights [Table Text Block] Tabular disclosure of the summary of residential mortgage servicing rights as measured at balance sheet date. Activity in Capitalized Mortgage Servicing Rights [Table Text Block] Schedule of Servicing Assets at Fair Value [Table Text Block] Assumptions to Value Mortgage Servicing Rights [Table Text Block] Assumptions to Value Mortgage Servicing Rights [Table Text Block] Assumptions to Value Mortgage Servicing Rights [Table Text Block] Aging Status of Mortgage Loans Serviced For Others [Table Text Block] Aging Status of Mortgage Loans Serviced For Others [Table Text Block] Tabular disclosure of all Mortgage Loans Serviced For Others by aging status. Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by (used in) operating activities: [Abstract] Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Change in fair value of mortgage servicing rights due to market changes Mortgage Servicing Rights (MSR) Impairment (Recovery) Change in fair value of mortgage servicing rights due to principal payments Change in fair value of mortgage servicing rights due to loan runoff Represents the non-cash decrease in net pre-tax net income related to the change in fair value of mortgage servicing rights due to loan runoff Net unrealized losses from derivative contracts Unrealized Gain (Loss) on Derivatives Share-based compensation Share-based Compensation Depreciation and amortization Depreciation, Amortization and Accretion, Net Net amortization of securities discounts and premiums Accretion (Amortization) of Discounts and Premiums, Investments Net losses (gains) on financial instruments and other losses(gains), net Realized Investment Gains (Losses) Net gain on mortgage loans held for sale Net gain on mortgage loans held for sale Represents the combined realized net gain from sale of residential mortgage loans and the change in the unrealized net gain on mortgage loans held for sale during the period. Mortgage loans originated for sale Payments for Origination of Mortgage Loans Held-for-sale Proceeds from sale of mortgage loans held for sale Proceeds from Sale of Mortgage Loans Held-for-sale Capitalized mortgage servicing rights Capitalized mortgage servicing rights Represents non-cash adjustment to reconcile net income related to capitalization of mortgage servicing rights. Change in trading and fair value option securities Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI Change in receivables Increase (Decrease) in Receivables Change in other assets Increase (Decrease) in Other Operating Assets Change in accrued interest, taxes and expense Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Change in other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows From Investing Activities: [Abstract] Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from maturities or redemptions of investment securities Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Proceeds from maturities or redemptions of available for sale securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Purchases of investment securities Payments to Acquire Held-to-maturity Securities Purchases of available for sale securities Payments to Acquire Debt Securities, Available-for-sale Proceeds from sales of available for sale securities Change in amount receivable on unsettled available for sale securities transactions Change in amount receivable on unsettled security transactions Change in amount receivable on unsettled security transactions. This is an investing cash flow. Loans originated, net of principal collected Payments for (Proceeds from) Loans and Leases Net payments on derivative asset contracts Payments for (Proceeds from) Derivative Instrument, Investing Activities Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Proceeds from disposition of assets Proceeds from Sale of Productive Assets Purchases of assets Payments to Acquire Productive Assets Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows From Financing Activities: [Abstract] Net Cash Provided by (Used in) Financing Activities [Abstract] Net change in demand deposits, transaction deposits and savings accounts Net change in demand deposits, transaction deposits and savings accounts Net change in demand deposits, transaction deposits and savings accounts Net change in time deposits Increase (Decrease) in Time Deposits Net change in other borrowed funds Proceeds from (Repayments of) Debt Repayment of subordinated debentures Repayments of Subordinated Debt Issuance of subordinated debentures, net of issuance costs Proceeds from Issuance of Subordinated Long-term Debt Change in amount due on unsettled security purchases Proceeds from (Payments for) Other Financing Activities Issuance of common and treasury stock, net Proceeds from Issuance of Common Stock Net change in derivative margin accounts Net change in derivative margin accounts The net change in derivative margin accounts. Net payments or proceeds on derivative liability contracts Payments for (Proceeds from) Derivative Instrument, Financing Activities Repurchase of common stock Payments for Repurchase of Common Stock Dividends paid Payments of Ordinary Dividends, Common Stock Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Supplemental Cash Flow Information: [Abstract] Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for taxes Income Taxes Paid, Net Net loans and bank premises transferred to repossessed real estate and other assets Real Estate Owned, Transfer to Real Estate Owned Increase in U.S. government guaranteed loans eligible for repurchase Increase in U.S. government guaranteed loans eligible for repurchase Represents the non-cash increase in loans related to the right but not the obligation to repurchases loans previously sold into Ginnie Mae pools based on certain criteria and as such has effectively regained control of the asset and must recognize the loan on the balance sheet. Increase in receivables from conveyance of GNMA OREO Conveyance of other real estate owned guaranteed by US govt Represents non-cash conveyance of other real estate owned guaranteed by U.S. government agencies during period. Fair Value Measurements, Measured On Recurring Basis, Significant Unobservable Inputs, Quantitative Information [Abstract] Fair Value Measurements, Measured On Recurring Basis, Significant Unobservable Inputs, Quantitative Information [Abstract] Quoted prices of loans sold in securitization transactions, with a liquidity discount applied [Member] Quoted prices of loans sold in securitization transactions, with a liquidity discount applied [Member] Quoted prices of loans sold in securitization transactions, with a liquidity discount applied [Member] Interest Rate Spread [Member] Interest Rate Spread [Member] Interest Rate Spread [Member] Liquidity discount [Member] Measurement Input, Discount for Lack of Marketability [Member] Available for sale securities Residential mortgage loans held for sale Mortgages Held-for-sale, Fair Value Disclosure Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies Represents a liquidity discount applied to the market value of mortgage loans qualifying for sale to U.S. government agencies when a mortgage loan is ineligible for sale to U.S. government agencies. Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities, Minimum Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Minimum The minimum yield spread of tax-exempt investment grade securities over comparable tax-exempt securities expressed as basis points. Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities, Maximum Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Maximum The maximum yield spread of tax-exempt investment grade securities over comparable tax-exempt securities. Average Yields On Comparable Short-term Taxable Securities Average Yields On Comparable Short-term Taxable Securities Maximum The average rate of yield for comparable short-term investment grade taxable security. Range of fair value as a percentage of par value Range of fair value as a percentage of part value Range of fair value as a percentage of part value Range of interest rates used to value securities Range of Interest Rates used to Value Securities Range of Interest Rates used to Value Securities Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Notional Amount of Derivatives [Abstract] Notional Disclosures [Abstract] Derivative Assets, Notional Derivative Asset, Notional Amount Derivative Liabilities, Notional Derivative Liability, Notional Amount Derivative Assets, Fair Value, Net [Abstract] Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] Derivative Assets, Gross Fair Value Derivative Asset, Fair Value, Gross Asset Derivative Assets, Netting Adjustments Derivative Asset, Netting Adjustments Represents amount of gross derivative asset positions offset by gross derivate liability due to enforceable master netting or similar agreements. Derivative Assets, Net Fair Value Before Cash Collateral Derivative Assets, Net Fair Value Before Cash Collateral Represents net derivative assets before offsetting the obligation to return cash collateral under a master netting or similar arrangement. Derivative Assets, Cash Collateral Derivative Asset, Collateral, Obligation to Return Cash, Offset Derivative Assets, Fair Value, Net of Cash Collateral Derivative Asset Derivative Liabilities, Fair Value, Net [Abstract] Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract] Derivative Liabilities, Gross Fair Value Derivative Liability, Fair Value, Gross Liability Derivative Liabilities, Netting Adjustments Derivative Liability, Netting Adjustments Represents amount of gross derivative liability positions offset by gross derivative asset positions due to enforceable master netting or similar arrangements. Derivative Liabilities, Net Fair Value Before Cash Collateral Derivative Liability, Net Fair Value Before Cash Collateral Represents net derivative liability before consideration of right to reclasim cash collateral under master netting or similar arrangements. Derivative Liabilities, Cash Collateral Derivative Liability, Collateral, Right to Reclaim Cash, Offset Derivative Liabilities, Fair Value, Net of Cash Collateral Derivative Liability Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] 30 to 59 Days Past Due [Member] Financing Receivables, 30 to 59 Days Past Due [Member] 60 to 89 Days Past Due [Member] Financing Receivables, 60 to 89 Days Past Due [Member] 90 Days or More [Member] Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Commercial [Member] Commercial Portfolio Segment [Member] Commercial Real Estate [Member] Commercial Real Estate Portfolio Segment [Member] Residential Mortgage [Member] Residential Portfolio Segment [Member] Personal [Member] Consumer Portfolio Segment [Member] Class of Financing Receivable [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivables [Domain] Class of Financing Receivable, Type [Domain] Energy [Member] Energy [Member] Class of financing receivables related to energy industry Services [Member] Services [Member] Class of financing receivables related to services industry Wholesale/retail [Member] Wholesale and retail [Member] Class of financing receivables related to wholesale/retail industry. Manufacturing [Member] Manufacturing [Member] Class of financing receivables related to manufacturing industry. Healthcare [Member] Health Care [Member] Public finance [Member] Public Finance [Member] Class of financing receivables related to public finance Other commercial and industrial [Member] Other Commercial and Industrial [Member] Class of financing receivables related to other commercial and industrial industry. Residential construction and land development [Member] Residential construction and land development [Member] Residential construction and land development [Member] Retail [Member] Retail [Member] Office [Member] Office [Member] Class of financing receivables related for which repayment will come from the sale or rental of office space. Multifamily [Member] Multifamily [Member] Industrial [Member] Industrial [Member] Class of financing receivables for which repayment will come from the sale or rental of industrial facilities. Other commercial real estate [Member] Other Commercial Real Estate [Member] Class of financing receivables for which repyament is expected from the sale or rental of other commercial real estate properties. Permanent mortgage [Member] Permanent Residential Mortgage [Member] Class of financing receivables related to mortgages of permanent residences. Permanent mortgages guaranteed by U.S. government agencies [Member] Permanent Mortgages Guaranteed by US Government Agencies [Member] Class of financing receivables related to mortages for permanent residences guaranteed by U.S. government agencies. Home equity [Member] Home Equity Line of Credit [Member] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing receivable, recorded investment, aging [Abstract] Financing Receivable, Recorded Investment, Aging [Abstract] Current Financing Receivable, Recorded Investment, Current Past Due Financing Receivable, Recorded Investment, Past Due Nonaccrual Financing Receivable, Recorded Investment, Nonaccrual Status Total Loans and Leases Receivable, Gross Other borrowings [Text Block] Debt Disclosure [Text Block] Income Tax Disclosure [Abstract] Federal and State Income Taxes [Text Block] Income Tax Disclosure [Text Block] Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Significant Accounting Policies [Text Block] Stockholders' Equity Note [Abstract] Shareholders' Equity [Text Block] Stockholders' Equity Note Disclosure [Text Block] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] Equity in undistributed income of bank subsidiaries Change in other assets Net cash provided by operating activities Investment in subsidiaries Investment in subsidiaries Investment in subsidiaries Net cash used in investing activities Dividends paid Repurchase of common stock Net cash used in financing activities Net increase (decrease) in cash and cash equivalents Fees and Commissions Revenue [Text Block] Revenue from Contract with Customer [Text Block] Schedule of Variable Interest Entities [Table Text Block] Schedule of Variable Interest Entities [Table Text Block] Numerator: [Abstract]: Numerator: [Abstract] -- None. No documentation exists for this element. -- Less: Earnings allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Numerator for basic earnings per share - income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Effect of reallocating undistributed earnings of participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted Numerator for diluted earnings per share - income available to common shareholders Net Income (Loss) Available to Common Stockholders, Diluted Denominator: [Abstract] Denominator: [Abstract] -- None. No documentation exists for this element. -- Weighted average shares outstanding Weighted Average Number of Shares Outstanding, Basic and Diluted Less: Participating securities included in weighted average shares outstanding (in shares) Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights Denominator for basic earnings per common share (in shares) Weighted Average Number of Shares Outstanding, Basic Dilutive effect of employee stock compensation plans (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Denominator for diluted earnings per common share (in shares) Weighted Average Number of Shares Outstanding, Diluted Basic (in dollars per share) Earnings Per Share, Basic Diluted earnings per share (per share) Earnings Per Share, Diluted Excludes employee stock options with exercise prices greater than current market price. Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Reportable Segments [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Share-based Compensation [Abstract] Vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Required Holding Period Share-based Compensation Arrangement by Share-based Payment Award, Award Required Holding Period Share-based Compensation Arrangement by Share-based Payment Award, Award Required Holding Period Following Vesting Period. Derivatives [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension Plan [Member] Pension Plan [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Gross charge-offs against allowance for loan losses Allowance for Loan and Lease Losses, Write-offs Net losses and expenses of repossessed assets, net Repossessed Assets Expense And Net Losses Amount of expense and net losses recognized during the period for repossessed assets. Defined Benefit Plan, Plan Assets, Amount Defined Benefit Plan, Plan Assets, Amount Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Specific Allowance [Member] Specific Allowance [Member] Financing receivables and related allowance that have been spefically allocated to a portfolio segment. Nonspecific Allowance [Member] Unallocated Financing Receivables [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Activity in allowance for credit losses [Abstract] Activity In Allowance For Credit Losses [Abstract] -- None. No documentation exists for this element. -- Allowance for loan losses [Roll Forward] Financing Receivable, Allowance for Credit Losses [Roll Forward] Beginning balance Loans and Leases Receivable, Allowance Provision for loan losses Provision for Loan and Lease Losses Loans charged off Financing Receivable, Allowance for Credit Losses, Write-downs Recoveries Financing Receivable, Allowance for Credit Losses, Recovery Ending balance Accrual for off-balance sheet credit losses [Abstract] Allowance For Off-Balance Sheet Credit Losses [Abstract] -- None. No documentation exists for this element. -- Accrual for off-balance sheet credit losses [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Beginning balance SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Provision for off-balance sheet credit risk Provision for Other Credit Losses Ending balance Total provision for credit losses Recorded investment [Abstract] Recorded Investment [Abstract] -- None. No documentation exists for this element. -- Collectively measured for impairment, recorded investment Financing Receivable, Collectively Evaluated for Impairment Individually measured for impairment, recorded investment Financing Receivable, Individually Evaluated for Impairment Total Related allowance [Abstract] Related Allowance [Abstract] -- None. No documentation exists for this element. -- Collectively measured for impairment, related allowance Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Individually measured for impairment, related allowance Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Total measured for impairment, related allowance Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption Increase of reported right of use assets and liabilities Increase of reported right of use assets and liabilities Increase of reported right of use assets and liabilities minimum Employee Benefits [Text Block] Pension and Other Postretirement Benefits Disclosure [Text Block] Reportable Segments [Text Block] Segment Reporting Disclosure [Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Energy Producers [Member] Energy Producers [Member] Energy Producers [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Type [Domain] Geographic Concentration Risk [Member] Geographic Concentration Risk [Member] Credit Concentration Risk [Member] Credit Concentration Risk [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Texas [Member] TEXAS Oklahoma [Member]