Investments, Debt and Equity Securities [Abstract] Investment securities available for sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Investment securities held to maturity Debt Securities, Held-to-maturity [Table Text Block] Amortized cost and fair values of investment securities available for sale by contractual maturity Investments Classified by Contractual Maturity Date [Table Text Block] Realized gains and losses and proceeds from sale Schedule of Realized Gain (Loss) [Table Text Block] Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length Schedule of Unrealized Loss on Investments [Table Text Block] Receivables [Abstract] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Commercial and industrial Commercial And Industrial Financing Receivable [Member] Commercial and industrial financing receivable member. Commercial real estate — owner occupied Commercial Real Estate Owner Occupied Portfolio [Member] Commercial real estate owner occupied residential loans Commercial and business lending Commercial And Business Lending [Member] Commercial and business lending Commercial real estate — investor Commercial Real Estate Investor Portfolio Segment [Member] Commercial real estate - investor loans. Real estate construction Construction Loans [Member] Commercial real estate lending Commercial Real Estate Portfolio Segment [Member] Total commercial Commercial Portfolio Segment [Member] Residential mortgage Residential Mortgage [Member] Home equity Home Equity Line of Credit [Member] Other consumer Other consumer [Member] Installment. Total consumer Consumer Portfolio Segment [Member] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Pass Pass [Member] Special Mention Special Mention [Member] Potential Problem Potential Problem [Member] Potential problem. Nonaccrual Nonaccrual Loan [Member] Nonaccrual loan. Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Loans and Leases Receivable, Net of Deferred Income Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Not Designated as Hedging Instrument, Economic Hedge [Member] Not Designated as Hedging Instrument, Economic Hedge [Member] Designated as Hedging Instrument [Member] Designated as Hedging Instrument [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Income [Member] Interest Income [Member] Other Operating Income (Expense) [Member] Other Operating Income (Expense) [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Business Combinations [Abstract] Estimated Fair Values of Assets Acquired and Liabilities Assumed Schedule of Business Acquisitions, by Acquisition [Table Text Block] Acquired loans fair value calculation Acquired loans fair value calculation [Table Text Block] Acquired loans fair value calculation [Table Text Block] Balance at beginning of period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Purchases Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions Accretion Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Net reclassification from non-accretable yield Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference Other(a) Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Accretable Yield Other Other increase or decrease in the aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans not accounted for as debt securities. End Balance Defined Benefit Plan [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Retirement Account Plan Pension Plan [Member] Postretirement Plan Other Postretirement Benefits Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] 2019 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 2020 Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year Five 2024 - 2028 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Prior service cost Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Net Of Tax Net actuarial loss Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains (Losses) Net Of Tax Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Deposits [Abstract] Deposits, by Type [Abstract] Deposits, by Type [Abstract] Noninterest-bearing demand deposits Noninterest-bearing Domestic Deposit, Demand Savings Deposits, Savings Deposits Interest-bearing demand Deposits, Negotiable Order of Withdrawal (NOW) Money market Deposits, Money Market Deposits Brokered CDs Brokered Certificates Of Deposit Brokered certificates of deposit. Other time Other Time Deposits Other time deposits Total deposits Deposits Deposits by type Deposits By Type [TableText Block] Deposits by type [Table Text Block] Time deposits by maturity Time Deposits By Maturity [Table Text Block] Time Deposits By Maturity [Table Text Block] Income Tax Disclosure [Abstract] Effective Income Tax Rate Reconciliation Effective Income Tax Rate Reconciliation, Percent [Abstract] Federal income tax rate at statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Increases (decreases) resulting from: Increase decrease in effective income tax rate [Abstract] Tax-exempt interest and dividends Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent State income taxes (net of federal benefit) Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Bank owned life insurance Bank Owned Life Insurance 1 Bank owned life insurance Tax effect of tax credits and benefits, net of related expenses Effective Income Tax Rate Reconciliation, Tax Credit, Percent Tax reserve adjustments / settlements Increase (Decrease) in Tax Reserve Adjustments Increase (Decrease) in Tax Reserve Adjustments Net tax benefit from stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Tax Cuts and Jobs Act impact on deferred remeasurement TCJA Impact Deferred Remeasurement TCJA Impact Deferred Remeasurement Tax planning in response to TCJA Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent FDIC premium FDIC premium FDIC premium Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Bank Mutual [Member] Bank Mutual [Member] Bank Mutual [Member] Oil and Gas Portfolio Segment [Member] Oil and Gas Portfolio Segment [Member] Portfolio segment of the company's total financing receivables related to oil and gas receivables. Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Loans and Leases Receivable, Net of Deferred Income, Purchased Credit Impaired Loans And Covered Loans Loans and Leases Receivable, Net of Deferred Income, Purchased Credit Impaired Loans And Covered Loans Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio which are purchased credit impaired and those whose losses will be shared with the Federal Deposit Insurance Corporation under loss sharing agreements before deducting the allowance for losses on loans and leases. Allowance for loan losses Loans and Leases Receivable, Allowance Percent of Loans Percent of Loans Percent of Loans Financing Receivable, Modifications, Post-Modification Recorded Investment Financing Receivable, Modifications, Post-Modification Recorded Investment Restructured Loans Subsequently Accruing Restructured Loans Subsequently Accruing Restructured Loans Subsequently Accruing Ytd Restructured Loans Still On Nonaccrual Ytd Restructured Loans Still On Nonaccrual Ytd Restructured Loans Still On Nonaccrual Loans and Leases Receivable, Impaired, Commitment to Lend Loans and Leases Receivable, Impaired, Commitment to Lend UnaccretedPurchaseDiscount UnaccretedPurchaseDiscount UnaccretedPurchaseDiscount UnaccretedPurchaseDiscount_PerformingLoans UnaccretedPurchaseDiscount_PerformingLoans Unaccreted Purchase Discount Performing Loans UnaccretedPurchaseDiscount_NonPerformingLoans UnaccretedPurchaseDiscount_NonPerformingLoans Unaccreted Purchase Discount NonPerforming Loans Fair Value Disclosures [Abstract] Closing Ratio Fair Value Inputs Closing Ratio Represents the percentage of loans currently in a lock position which management estimates will ultimately close. Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Capital market fees, net Capital Market Fees [Member] Capital market fees. Mortgage banking, net Mortgage Banking [Member] Interest rate-related instruments — customer and mirror Interest Rate Related Instruments Customer and Mirror [Member] Interest rate related instruments customer and mirror. Interest rate lock commitments (mortgage) Interest Rate Lock Commitments [Member] Forward commitments (mortgage) Forward Contracts [Member] Foreign currency exchange forwards Foreign Exchange Forward [Member] Commodity contracts Commodity Contract [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Gain (loss) on derivative instruments not designated as hedging instruments Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] Gain / (Loss) Recognized in Income Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Segment Reporting, Measurement Disclosures [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Domain] Adjustments for Change in Accounting Principle [Domain] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Number of Reportable Segments Number of Reportable Segments Restructured Loans Subsequent Default [Table] Restructured Loans Subsequent Default [Table] Table showing troubled debt restructuring subsequent defaults by loan type Financing Receivable, Troubled Debt Restructuring [Axis] Class of Financing Receivable, Type of Borrower [Axis] Financing Receivable, Troubled Debt Restructuring [Domain] Class of Financing Receivable, Type of Borrower [Domain] Commercial and industrial Real estate construction Residential mortgage Residential Portfolio Segment [Member] Home equity Home Equity Port Folio Segments [Member] Home equity portfolio segments. Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Number of Loans Financing Receivable, Modifications, Subsequent Default, Number of Contracts Recorded Investment Financing Receivable, Modifications, Subsequent Default, Recorded Investment Regulatory Capital Requirements [Abstract] Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Cash and due from banks Cash and Due from Banks Interest-bearing deposits in other financial institutions Interest-bearing Deposits in Banks and Other Financial Institutions Federal funds sold and securities purchased under agreements to resell Federal Funds Sold and Securities Purchased under Agreements to Resell Investment securities held to maturity, at amortized cost Debt Securities, Held-to-maturity Investment securities available for sale, at fair value Available-for-sale Securities Federal Home Loan Bank and Federal Reserve Bank stocks, at cost Federal Home Loan Bank Stock and Federal Reserve Bank Stock Residential loans held for sale Residential Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Amount, after allowance for bad debt, of Residential loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. Commercial loans held for sale Commercial Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Amount, after allowance for bad debt, of Commercial loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. Loans Allowance for loan losses Loans, net Loans and Leases Receivable, Net Amount Bank and corporate owned life insurance Bank and Corporate Owned Life Insurance The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (the bank or corporation) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. Investment in unconsolidated subsidiaries Other Short-term Investments Trading assets Derivative Asset Premises and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Mortgage servicing rights, net Servicing Asset Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets Total assets Assets Liabilities and stockholders' equity Liabilities and Equity [Abstract] Interest-bearing deposits Interest-bearing Deposit Liabilities, Domestic Federal funds purchased and securities sold under agreements to repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase Commercial Paper Other Short-term Borrowings FHLB Advances TotalFHLB_Advances Total FHLB_Advances Other long-term funding Other Long-term Debt Trading liabilities Derivative Liability Accrued expenses and other liabilities Other Liabilities Total liabilities Liabilities Stockholders’ equity (1) Stockholders' Equity Attributable to Parent [Abstract] Preferred equity Preferred Stock, Including Additional Paid in Capital Common stock Common Stock, Value, Issued Surplus Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost Treasury Stock, Value Total common equity Total Common Equity Total Common Equity Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Preferred shares issued Preferred Stock, Shares Issued Preferred shares authorized (par value $1.00 per share) Preferred Stock, Shares Authorized Common shares issued Common Stock, Shares, Issued Common shares authorized (par value $0.01 per share) Common Stock, Shares Authorized Treasury shares of common stock Treasury Stock, Shares Net Adjustment, Stock-based Compensation Plans, warrants, options, RSU/A (1) Net Adjustment, Stock-based Compensation Plans, warrants, options, RSU/A Net Adjustment, Stock-based Compensation Plans, warrants, options, RSU/A Schedule of Available-for-sale and Held-to-maturity Securities [Table] Schedule of Available-for-sale and Held-to-maturity Securities [Table] Schedule of Available-for-sale and Held-to-maturity Securities Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] FNMA / FHLMC Fannie Mae and Freddie Mac [Member] Fannie Mae and Freddie Mac [Member] GNMA Ginnie Mae [Member] Ginnie Mae [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] U.S. Treasury securities US Treasury Securities [Member] Obligations of state and political subdivisions (municipal securities) US States and Political Subdivisions Debt Securities [Member] Residential Related Securities Residential Mortgage Backed Securities [Member] Private-label Mortgage-backed Securities, Issued by Private Enterprises [Member] GNMA commercial mortgage-related securities Commercial Mortgage Backed Securities [Member] FFELP asset backed securities Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] Debt Securities [Member] Debt Securities [Member] Equity securities Equity Securities [Member] Length Of Time Held To Maturity Securities Are In Continuous Unrealized Loss Position [Axis] Length Of Time Held To Maturity Securities Are In Continuous Unrealized Loss Position [Axis] Length of Time Held to Maturity Securities are In Continuous Unrealized Loss Positions [Domain] Length of Time Held to Maturity Securities are In Continuous Unrealized Loss Positions [Domain] Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items] [Line Items] for Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Table] Unrealized losses and fair value of available for sale securities , by investment category and time length Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Unrealized losses on available for sale securities, less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Unrealized losses on available for sale securities, 12 months or more Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total unrealized losses on available for sale securities Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Fair value of unrealized losses on available for sale securities, less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Fair value of unrealized losses on available for sale securities, 12 months or more Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total fair value of unrealized losses on available for sale securities Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Number of available for sale securities in a continuous unrealized loss position less than twelve months Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year Number of available for sale securities in a continuous unrealized loss position for twelve months or more Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract] Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] Unrealized losses on held to maturity securities, less than 12 months Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months Unrealized losses on held to maturity securities, 12 months or more Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total unrealized losses on held to maturity securities Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss Fair value of unrealized losses on held to maturity securities, less than 12 months Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer Fair value of unrealized losses on held to maturity securities, 12 months or more Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Total fair value of unrealized losses on held to maturity securities Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value Number of held to maturity securities in a continuous unrealized loss position Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Retirement Benefits [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] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum Maximum [Member] Minimum [Member] Minimum [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Performance-based Restricted Stock Award [Member] Performance-based Restricted Stock Award [Member] Performance-based Restricted Stock Award [Member] Service-based Restricted Stock Award [Member] Service-based Restricted Stock Award [Member] Service-based Restricted Stock Award [Member] Employee Stock Option [Member] Employee Stock Option [Member] Restricted Stock Award [Member] Restricted Stock Award [Member] Restricted Stock Award. Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2017 Incentive Compensation Plan [Member] 2017 Incentive Compensation Plan [Member] 2017 Incentive Compensation Plan [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Term of transfer restrictions Share-based Compensation Arrangement by Share-based Payment Award, Term of Transfer Restrictions Share-based Compensation Arrangement by Share-based Payment Award, Term of Transfer Restrictions Expiration term of awards Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Shares remaining available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Recognized compensation expense for accelerated vesting of stock options Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost Recognized compensation expense for vesting of stock options Allocated Share-based Compensation Expense String_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost String_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost String_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost Unvested share-based payment awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition Employee service share based compensation nonvested awards total compensation cost not yet recognized year for recognition. Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Stock Based Compensation (Textuals) [Abstract] Stock Based Compensation (Textuals) [Abstract] Stock based compensation. Intrinsic value of stock options exercised InstrinsicValueOfStockOptionsExercised Intrinsic value represents the amount by which the fair market value of the underlying stock exceeds the exercise price of the stock option. Total fair value of vested stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Revenue Recognition [Abstract] Revenue Recognition, Multiple-deliverable Arrangements [Table] Revenue Recognition, Multiple-deliverable Arrangements [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments [Member] Operating Segments [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Corporate and Commercial Specialty [Member] Corporate and Commercial Specialty [Member] Corporate and Commercial Specialty [Member] Community, Consumer and Business [Member] Community, Consumer and Business [Member] Community, Consumer and Business [Member] Risk Management and Shared Services [Member] Risk Management and Shared Services [Member] Risk Management and Shared Services [Member] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Insurance Commissions and Fees [Member] Insurance Commissions and Fees [Member] Insurance Commissions and Fees [Member] Deposit Account [Member] Deposit Account [Member] Card-Based and No Loan Fees [Member] Card-Based and No Loan Fees [Member] Card-Based and No Loan Fees [Member] Fiduciary and Trust [Member] Fiduciary and Trust [Member] Brokerage Commission and Fees [Member] Brokerage Commission and Fees [Member] Brokerage Commission and Fees [Member] Other Revenue [Member] Other Revenue [Member] Other Revenue [Member] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Noninterest Income In Scope of Topic 606 Noninterest Income In Scope of Topic 606 Noninterest Income In Scope of Topic 606 Noninterest Income, Outside of Scope of Topic 606 Noninterest Income, Outside of Scope of Topic 606 Noninterest Income, Outside of Scope of Topic 606 Total noninterest income Noninterest Income Accounting Policies [Abstract] Schedule of Finite-Lived Intangible Assets [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 Deposit Intangibles Core Deposits [Member] Other Intangibles Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Net period benefit cost for the pension and postretirement plans Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of actuarial loss (gain) Defined Benefit Plan, Amortization of Gain (Loss) Recognized settlement loss (gain) Defined Benefit Plan, Other Cost (Credit) Total net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Defined Benefit Plan, Interest Cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Amortization of Gain (Loss) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Short-term Debt [Abstract] Schedule of Assets Sold under Agreements to Repurchase [Table] Schedule of Assets Sold under Agreements to Repurchase [Table] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Overnight and Continuous Maturity Overnight and on Demand [Member] Up to 30 days Maturity Less than 30 Days [Member] 30-90 days Maturity 30 to 90 Days [Member] Greater than 90 days Maturity Greater than 90 Days [Member] Agency mortgage-related securities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Remaining Contractual Maturity of the Agreements Assets Sold under Agreements to Repurchase [Line Items] Repurchase agreements Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Amount Recorded at Acquisition [Axis] Amount Recorded at Acquisition [Axis] Amount Recorded at Acquisition [Axis] Amount Recorded at Acquisition [Domain] Amount Recorded at Acquisition [Domain] [Domain] for Amount Recorded at Acquisition [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Allowance for Unfunded Commitments SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] Change in the Allowance for Unfunded Commitments SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Balance at beginning of period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Provision for unfunded commitments Provision for Other Credit Losses Amount recorded at acquisition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses Balance at end of period Recent Developments Details [Abstract] Recent Developments Details [Abstract] Recent Developments [Table] Recent Developments [Table] Recent Developments [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series C Preferred Stock Series C Preferred Stock [Member] Series D Preferred Stock Series D Preferred Stock [Member] Series E Preferred Stock Series E Preferred Stock [Member] Common Stock Common Stock [Member] Recent Developments [Line Items] Recent Developments [Line Items] [Line Items] for Recent Developments [Table] Common stock, dividends declared ($ per share) Common Stock, Dividends, Per Share, Declared Preferred stock, dividends declared ($ per share) Preferred Stock, Dividends Per Share, Declared Preferred Stock, Dividend Rate, Percentage Preferred Stock, Dividend Rate, Percentage Stock repurchase program authorized amount Stock Repurchase Program, Authorized Amount Remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Income Statement [Abstract] Statement [Table] Statement [Table] Risk Management and Shared Serivies [Member] Risk Management and Shared Serivies [Member] Risk Management and Shared Serivies Service charges and deposit account fees Card-Based and Loan Fees [Member] Card-Based and Loan Fees [Member] Card-Based and Loan Fees [Member] Trust and asset management fees Brokerage and advisory fees Statement [Line Items] Statement [Line Items] Interest income Interest and Dividend Income, Operating [Abstract] Interest and fees on loans Interest and Fee Income, Loans and Leases Interest and dividends on investment securities Interest and Dividend Income, Securities, by Taxable Status [Abstract] Taxable Interest Income, Securities, Operating, Taxable Tax-exempt Interest Income, Securities, Operating, Tax Exempt Other interest Other Interest and Dividend Income Total interest income Interest and Dividend Income, Operating Interest expense Interest Expense [Abstract] Interest on deposits Interest Expense, Deposits Interest on Federal funds purchased and securities sold under agreements to repurchase Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase Interest on other short-term funding Interest Expense, Other Short-term Borrowings Interest on FHLB advances Interest on FHLB Funding Interest on FHLB Funding Interest on long-term funding Interest Expense, Long-term Debt Total interest expense Interest Expense Net interest income Interest Income (Expense), Net Provision for credit losses Provision for Loan, Lease, and Other Losses Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Noninterest income Noninterest Income [Abstract] Service charges on deposit account fees Revenue from Contract with Customer, Including Assessed Tax Capital markets, net Capital Market Fees Net Capital market fees, net. Mortgage banking, net Fees and Commissions, Mortgage Banking and Servicing Bank and corporate owned life insurance Bank and Corporate Owned Life Insurance Income Earnings on or other increases in the value of the cash surrender value of bank and corporate owned life insurance policies. Asset gains (losses), net (a) Gain (Loss) on Disposition of Assets for Financial Service Operations Investment securities gains (losses), net Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments Other Noninterest Income, Other Operating Income Noninterest expense Noninterest Expense [Abstract] Personnel Labor and Related Expense Technology Information Technology and Data Processing Occupancy Occupancy, Net Business development and advertising Marketing and Advertising Expense Equipment Equipment Expense Legal and professional Legal And Professional Fees Legal and professional fees. Card issuance and loan costs Loan Expense Loan Expense Foreclosure / OREO expense, net Foreclosed Real Estate Expense FDIC assessment Federal Deposit Insurance Corporation Premium Expense Other intangible amortization Amortization of Intangible Assets Acquisition related costs (b) Business Combination, Acquisition Related Costs Other Other Noninterest Expense Total noninterest expense Noninterest Expense Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent Preferred stock dividends Preferred Stock Dividends and Other Adjustments Net income available to common equity Net Income (Loss) Available to Common Stockholders, Basic Earnings per common share Earnings Per Share [Abstract] Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Tax planning in response to TCJA Fair Value Measurements Fair Value Disclosures [Text Block] Earnings Per Share Textuals [Abstract] Earnings per share. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Common Stock Warrant [Member] Warrant [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Deposits Deposit Liabilities Disclosures [Text Block] Document And Entity Information [Abstract] Document And Entity Information. Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus 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 Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Property, Plant and Equipment [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Payments, 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months Payments, 2020 Operating Leases, Future Minimum Payments, Due in Two Years Payments, 2021 Operating Leases, Future Minimum Payments, Due in Three Years Payments, 2022 Operating Leases, Future Minimum Payments, Due in Four Years Payments, 2023 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Operating Leases, Future Minimum Payments Receivable [Abstract] Operating Leases, Future Minimum Payments Receivable [Abstract] Receipts, 2019 Operating Leases, Future Minimum Payments Receivable, Current Receipts, 2020 Operating Leases, Future Minimum Payments Receivable, in Two Years Receipts, 2021 Operating Leases, Future Minimum Payments Receivable, in Three Years Receipts, 2022 Operating Leases, Future Minimum Payments Receivable, in Four Years Receipts, 2023 Operating Leases, Future Minimum Payments Receivable, in Five Years Thereafter Operating Leases, Future Minimum Payments Receivable, Thereafter Total Operating Leases, Future Minimum Payments Receivable Commitments and Contingencies Disclosure [Abstract] Mortgage Repurchase Reserve Mortgage Repurchase Reserve [Member] Summary of changes in the residential mortgage repurchase reserve [Line Items] ValuationAndQualifyingAccoun [Line Items] Residential mortgage repurchase reserve Repurchase provision expense SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Adjustments to provision expense SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) Charge offs, net SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Amount recorded at acquisition SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Balance sheet category and fair values of derivative instruments not designated as hedging instruments Summary Of Derivative Instruments Not Designated As Hedging Instruments [Table Text Block] Summary of derivative instruments not designated as hedging instruments. Balance Sheet Recording of Fair Value Hedge [Table Text Block] Balance Sheet Recording of Fair Value Hedge [Table Text Block] [Table Text Block] for Balance Sheet Recording of Fair Value Hedge [Table] Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Gain (loss) on derivative instruments not designated as hedging instruments Schedule Of Derivative Instruments Gain Loss Not Designated As Hedging Instruments [Table Text Block] Schedule of derivative instruments gain loss not designated as hedging instruments. Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Acquired Performing Loans Purchased Performing Loans [Member] Purchased Performing Loans [Member] Acquired Impaired Loans Purchase Credit Impaired Loans [Member] Purchase Credit Impaired Loans [Member] BKMU Assets Acquired Liabilities Assumed [Member] BKMU Assets Acquired Liabilities Assumed [Member] BKMU Assets Acquired Liabilities Assumed [Member] Financing Receivable Financing Receivable, Impaired [Line Items] Contractual required principal and interest at acquisition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition Contractual cash flows not expected to be collected (nonaccretable discount) Certain Loans Acquired in Transfer, Nonaccretable Difference Expected cash flows at acquisition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition Interest component of expected cash flows (accretable discount) Fair value of acquired loans Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value Subordinated Borrowing [Table] Subordinated Borrowing [Table] Subordinated Borrowing [Axis] Subordinated Borrowing [Axis] Subordinated Borrowing, Name [Domain] Subordinated Borrowing, Name [Domain] Two Thousand Eighteen Senior Notes [Member] [Domain] Two Thousand Eighteen Senior Notes [Member] [Domain] Two Thousand Eighteen Senior Notes [Member] [Domain] Two Thousand Fourteen Senior Notes [Member] Two Thousand Fourteen Senior Notes [Member] Two Thousand Fourteen Senior Notes [Member] Two Thousand Fourteen Subordinated Notes [Member] Two Thousand Fourteen Subordinated Notes [Member] Two Thousand Fourteen Subordinated Notes [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] FHLB, Increase in Advances [Domain] FHLB, Increase in Advances [Domain] FHLB, Increase in Advances [Domain] FLHB Advances, Putable [Domain] FLHB Advances, Putable [Domain] FLHB Advances, Putable [Domain] Subordinated Borrowing [Line Items] Subordinated Borrowing [Line Items] Collateral for repurchase agreements Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed New Senior Debt Issued New Senior Debt Issued New Senior Debt Issued Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Junior Subordinated Debentures Issued Junior Subordinated Debentures Issued Junior subordinated debentures issued. Debt Instrument, Term Debt Instrument, Term Subordinated Borrowing, Interest Rate Subordinated Borrowing, Interest Rate Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Offsetting [Abstract] Balance Sheet Offsetting Balance Sheet Offsetting Disclosure [Text Block] Balance Sheet Offsetting Disclosure Statement of Cash Flows [Abstract] Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Addition to (recovery of) valuation allowance on mortgage servicing rights, net Mortgage Servicing Rights (MSR) Impairment (Recovery) Amortization of mortgage servicing rights Amortization of Mortgage Servicing Rights (MSRs) Amortization of other intangible assets Amortization and accretion on earning assets, funding, and other, net Accretion (Amortization) of Discounts and Premiums, Investments Net amortization of tax credit investments Other Depreciation and Amortization Deferred income taxes Deferred Income Tax Expense (Benefit) Losses (gains) on sales of investment securities, net Marketable Securities, Gain (Loss) Asset (gains) losses, net (Gain) loss on mortgage banking activities, net Gain (Loss) on Sale of Mortgage Loans Mortgage loans originated and acquired for sale Payments for Origination and Purchases of Loans Held-for-sale Proceeds from sales of mortgage loans held for sale Proceeds from Sale of Mortgage Loans Held-for-sale Pension contributions Payment for Pension Benefits (Increase) decrease in interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Increase (decrease) in interest payable Increase (Decrease) in Interest Payable, Net Increase (Decrease) Cash Collateral from Counterparties Increase (Decrease) Cash Collateral from Counterparties Net change in other assets and other liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows from Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Net increase in loans Payments for (Proceeds from) Loans and Leases Purchases of Payments for Investing Activities [Abstract] Available for sale securities Payments to Acquire Available-for-sale Securities Held to maturity securities Payments to Acquire Held-to-maturity Securities Federal Home Loan Bank and Federal Reserve Bank stocks Payments to Acquire Federal Home Loan Bank Stock Premises, equipment, and software, net of disposals Payments for (Proceeds from) Productive Assets Proceeds from Proceeds from Investing Activities [Abstract] Sales of available for sale securities Proceeds from Sale of Available-for-sale Securities Sale of Federal Home Loan Bank and Federal Reserve Bank stocks Proceeds from Sale of Federal Home Loan Bank Stock Prepayments, calls, and maturities of available for sale investment securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Prepayments, calls, and maturities of held to maturity investment securities Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Sales, prepayments, calls and maturities of other assets Proceeds from Maturities, Prepayments and Calls of Other Investments Net change in tax credit and alternative investments Net Change in Tax Credit Investments The net cash outflow or inflow from changes in tax credit investments. Net cash (paid) received in acquisition Payments to Acquire Businesses, Net of Cash Acquired Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows from Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Net increase (decrease) in deposits Increase (Decrease) in Deposits Net increase (decrease) in short-term funding Proceeds from (Repayments of) Short-term Debt Net increase (decrease) in short-term FHLB advances Proceeds from (Repayment of) short-term FHLB Advances Proceeds from (Repayment of) short-term FHLB Advances Repayment of long-term FHLB advances Repayment of FHLB Advance Repayment of FHLB Advance Proceeds from long-term FHLB advances Proceeds from FHLB Advance Proceeds from FHLB Advance Repayment of long-term funding Repayments of Long-term Debt Proceeds from issuance of long-term funding Proceeds from Issuance of Long-term Debt Proceeds from issuance of preferred shares Proceeds from Issuance of Preferred Stock and Preference Stock Proceeds from issuance of common stock for stock-based compensation plans Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Redemption of preferred shares Payments for Repurchase of Redeemable Preferred Stock Redemption of warrants Payments for Repurchase of Warrants Purchase of preferred shares Payments for Repurchase of Preferred Stock and Preference Stock Purchase of common stock returned to authorized but unissued Payments for returned to authorized but unissued common stock Purchase of treasury stock payments for repurchase of common stock for tax withholding The cash outflow for repurchase of common stock for tax withholding Cash dividends on common stock Payments of Ordinary Dividends, Common Stock Cash dividends on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash, cash equivalents, and restricted cash at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents, and restricted cash at end of period Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for income and franchise taxes Income Taxes Paid, Net Loans and bank premises transferred to other real estate owned Real Estate Owned, Transfer to Real Estate Owned Capitalized mortgage servicing rights Servicing Asset at Fair Value, Additions Loans transferred into held for sale from portfolio, net Transfer of Portfolio Loans and Leases to Held-for-sale Acquisition Supplemental Cash Flow - Acquisition Information [Abstract] Supplemental Cash Flow - Acquisition Information [Abstract] Fair value of assets acquired, including cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Fair value ascribed to goodwill and intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Including Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Including Goodwill Fair value of liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Common stock issued in acquisition Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Cash and cash equivalents Cash Equivalents, at Carrying Value Restricted Cash Restricted Cash Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Gross gains on available for sale securities Debt Securities, Available-for-sale, Realized Gain Gross gains on held to maturity securities Debt Securities, Held-to-maturity, Sold, Realized Gain Debt Securities, Held-to-maturity, Sold, Realized Gain Total gains Debt Securities, Trading, Realized Gain Gross losses on available for sale securities Debt Securities, Available-for-sale, Realized Loss Gross losses on held to maturity securities Debt Securities, Held-to-maturity, Sold, Realized Loss Debt Securities, Held-to-maturity, Sold, Realized Loss Total losses Debt Securities, Trading, Realized Loss Investment securities gains, net Debt Securities, Realized Gain (Loss) Proceeds from sales of investment securities Proceeds from Sale and Maturity of Marketable Securities Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Summary of activity in accumulated other comprehensive income (loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Required minimum cash and reserve balances Cash and Securities Segregated under Federal and Other Regulations Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Operating Segments Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Segment Income Statement Data Abstract Segment Reporting Information, Profit (Loss) [Abstract] Net interest income Net intersegment interest income (expense) Net intersegment interest income (expense) Net intersegment interest income (expense) Segment net interest income Segment net interest income Segment net interest income Noninterest income Total revenue Revenues Credit provision (a) Noninterest expense Income (loss) before income taxes Income tax expense (benefit) Return on average allocated capital (ROCET1) (b) Return on average allocated capital Return on average allocated tier 1 common equity Segment Balance Sheet Data Segment Balance Sheet Data [Abstract] Segment Reporting Information Average earning assets Average earning assets Average earning assets Average loans Average Loans Average Loans Average deposits Average deposits Average deposits Average allocated capital (CETI)(b) Average allocated capital Average allocated tier 1 common equity Allocated goodwill Allocated Goodwill - Segment Allocated Goodwill - Segment Business Combination, Acquisition Related Costs Gain (Loss) on Disposition of Assets for Financial Service Operations FHLB Maturity Schedule Disclosure [Abstract] FHLB Maturity Schedule Disclosure [Abstract] FHLB_Maturity_ [Table] FHLB_Maturity_ [Table] FHLB_Maturity_ [Table] Maturity or put date 1 year or less FHLB Maturity within One Year [Domain] FHLB Maturity within One Year [Domain] After 1 but within 2 FHLB Maturity One Year to Two Years [Domain] FHLB Maturity One Year to Two Years [Domain] After 2 but within 3 FHLB Maturity Over Two Years to Three Years [Domain] FHLB Maturity Over Two Years to Three Years [Domain] After 3 years FHLB Maturity Over Three Years [Domain] FHLB Maturity Over Three Years [Domain] FHLB_Maturity_ [Line Items] FHLB_Maturity_ [Line Items] [Line Items] for FHLB_Maturity_ [Table] Weighted Average Coupon Rate FHLB Weighted Average Coupon Rate FHLB Weighted Average Coupon Rate Condensed Financial Information Disclosure [Abstract] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Parent Company Only Parent Company [Member] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Interest-bearing Deposits in Banks and Other Financial Institutions Notes and interest receivable from subsidiaries Notes Receivable, Related Parties, Noncurrent Investments in and receivable due from subsidiaries Investments in and Receivable Due from Subsidiaries Represents intercompany ownership interest in bank and nonbank subsidiaries Commercial paper Commercial Paper Senior notes, at par Senior Notes Subordinated notes, at par Subordinated Debt Long-term funding capitalized costs Other Long-term Debt and Capitalized Costs Other Long-term Debt and Capitalized Costs Total long-term funding Long-term Debt Accrued expenses and other liabilities Common equity Schedule Of Financing Receivable Troubled Debt Restructuring [Table] Schedule Of Financing Receivable Troubled Debt Restructuring [Table] Subsequent redefault table Number of Loans Financing Receivable, Modifications, Number of Contracts Recorded Investment Unpaid Principal Balance Financing Receivable, Modifications, Pre-Modification Recorded Investment Retirement Account Plan Prior to Merger [Member] Retirement Account Plan Prior to Merger [Member] Retirement Account Plan Prior to Merger [Member] Other Pension Plan [Member] Other Pension Plan [Member] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Rate of increase in compensation levels Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Rate of increase in compensation levels Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Expected long-term rate of return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Calculations for basic and diluted earnings per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Trading assets Trading Assets [Member] Trading liabilities Trading Liabilities [Member] Other assets Other Assets [Member] Other liabilities Other Liabilities [Member] Purchased options (time deposit) Purchased Deposit Option [Member] A purchased deposit option with an equity indexed derivative Written options (time deposit) Written Deposit Options [Member] Written deposit option with an equity indexed derivative interest rate product [Member] interest rate product [Member] interest rate product [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivative Instruments Not Designated as Hedging Instruments [Abstract] Derivative Instruments Not Designated as Hedging Instruments [Abstract] Notional Amount Derivative, Notional Amount Fair Value Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net Derivative, Fair Value, Net Derivative, Fair Value, Net Schedule Of Lending Related And Other Commitments [Table] Schedule Of Lending Related And Other Commitments [Table] Schedule Of Lending Related And Other Commitments. Lending-related commitments by type [Axis] Lending-related commitments by type [Axis] Lending related commitments by type. Lending Related Commitments By Type [Domain] Lending Related Commitments By Type [Domain] Lending related commitments by type. Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale Commitments to Extend Credit [Member] Commercial Letters Of Credit Commercial Letters Of Credit [Member] Commercial letters of credit. Standby Letters of Credit Standby Letters of Credit [Member] Schedule of lending-related and other commitments [Line Items] Schedule of lending-related and other commitments [Line Items] Schedule of lending-related and other commitments. Lending related commitments, fair value LendingRelatedCommitments, FairValue Lending Related Commitments, Fair Value Summary of lending-related and other commitments Lending Related And Other Commitments [Abstract] Lending related and other commitments. Lending related commitments Lending Related Commitments Lending related commitments. Standby letters of credit, fair value Lines of Credit, Fair Value Disclosure Short and Long-term funding Schedule of Short-term Debt [Table Text Block] Schedule of Repurchase Agreements Schedule of Repurchase Agreements [Table Text Block] FHLB_Maturity_ [Table Text Block] FHLB_Maturity_ [Table Text Block] [Table Text Block] for FHLB_Maturity_ [Table] Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Maturities of Long-term Debt [Table Text Block] Restructuring and Related Activities [Abstract] Recent Developments Subsequent Events [Text Block] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Revenue Recognition 606 [Text Block] Revenue Recognition 606 [Text Block] Revenue Recognition 606 [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Business and Basis of Financial Statement Presentation Basis of Accounting, Policy [Policy Text Block] Business Combinations Business Combinations Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Investment Securities Marketable Securities, Policy [Policy Text Block] Federal Home Loan Bank (FHLB) and Federal Reserve Bank Stocks Federal Home Loan Bank and Federal Reserve Bank Stocks [Policy Text Block] Federal Home Loan Bank ("FHLB") and Federal Reserve Bank Stocks Policy Loans Held for Sale Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] Loans Finance, Loan and Lease Receivables, Held-for-investment, Policy [Policy Text Block] Troubled Debt Restructurings (Restructured Loans) Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block] Allowance for Loan Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Other Real Estate Owned Loans and Leases Receivable, Real Estate Acquired Through Foreclosure, Policy [Policy Text Block] Reserve for Unfunded Commitments Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Premises and Equipment and Software Property, Plant and Equipment, Policy [Policy Text Block] Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Mortgage Servicing Rights Transfers and Servicing of Financial Assets, Servicing of Financial Assets, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Derivative and Hedging Activities Derivatives, Policy [Policy Text Block] Securities Sold Under Agreement to Repurchase Repurchase and Resale Agreements Policy [Policy Text Block] Retirement Plan Pension and Other Postretirement Plans, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Earnings Per Common Share Earnings Per Share, Policy [Policy Text Block] New Accounting Pronouncements Adopted New Accounting Pronouncements, Policy [Policy Text Block] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at beginning of year Unrecognized Tax Benefits Subtractions for tax positions related to prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Subtractions for settlements with tax authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Additions for tax positions related to current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Balance at end of year Current and Deferred Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Summary of Valuation Allowance [Table Text Block] Summary of Valuation Allowance [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Summary Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Fixed income securities Investment securities available for sale Debt Securities, Available-for-sale [Abstract] Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Debt Securities, Held-to-maturity [Abstract] Debt Securities, Held-to-maturity [Abstract] Amortized Cost Gross Unrealized Gains Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Held-to-maturity, Gross Unrealized Loss Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Fair Value Debt Securities, Held-to-maturity, Fair Value Selected segment information Schedule of Segment Reporting Information, by Segment [Table Text Block] Equity [Abstract] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Subsidiary equity balance Subsidiary Equity Balance Subsidiary Equity Balance Class Of Stock [Table] Class Of Stock [Table] information about different classes of stock Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Treasury Stock Treasury Stock, Common [Member] Class of Stock [Line Items] Class of Stock [Line Items] Depositary shares issued (in shares) Depositary Shares Issued Depositary shares issued in perpetual preferred stock Liquidation preference on depositary shares (in usd per share) Liquidation Preference On Depositary Shares Liquidation preference on depositary shares issued of perpetual preferred stock Preferred Stock, Redemption Terms Preferred Stock, Redemption Terms Redemption Price On Depositary Shares Redemption Price On Depositary Shares Redemption Price On Depositary Shares Depositary share value (in usd per share) Depositary Share Per Share Value Depositary share per share value in perpetual preferred stock Purchase of stock, value Stock Repurchased During Period, Value Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Remaining authorized repurchase amount Warrants to purchase shares of common stock (in shares) Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants Term of warrants Class of Warrant or Right, Term Class of Warrant or Right, Term Exercise price of warrants (in usd per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Class of Warrant or Right, Outstanding Class of Warrant or Right, Outstanding Shares from Warrant Exercises Shares from Warrant Exercises Shares from Warrant Exercises Unexercised Warrants, Expired Shares Unexercised Warrants, Expired Shares Unexercised Warrants, Expired Shares Treasury stock shares acquired (in shares) Treasury Stock, Shares, Acquired Treasury stock carrying basis Treasury Stock, Carrying Basis Treasury stock acquired average cost per share (in usd per share) Treasury Stock Acquired, Average Cost Per Share Treasury Stock, Shares, Retired Treasury Stock, Shares, Retired Treasury Stock, Retired, Cost Method, Amount Treasury Stock, Retired, Cost Method, Amount Repurchased amount for minimum tax withholding settlement Payments Related to Tax Withholding for Share-based Compensation Repurchased shares for minimum tax withholding settlements (in shares) Shares Paid for Tax Withholding for Share Based Compensation Minimum tax withholding settlement average cost per share (in usd per share) Minimum Tax Withholding Settlement Average Cost Per Share Depository share ratio Preferred Stock, Conversion Ratio to Depository Shares Preferred Stock, Conversion Ratio to Depository Shares Commercial and business lending Commercial real estate lending Commercial Real Estate Lending [Member] Commercial real estate loans Total commercial Commercial Financing Receivable [Member] Commercial financing receivable member. Home equity Total consumer Consumer Loan [Member] Loans with a related allowance Loans With Related Allowance [Member] Loans with a related allowance. Loans with no related allowance Loans With No Related Allowance [Member] Loans with no related allowance. Financing Receivable, Impaired [Line Items] Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans Loan and Lease Receivables, Impaired [Abstract] Recorded Investment Impaired Financing Receivable, Recorded Investment Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Related Allowance Impaired Financing Receivable, Related Allowance Average Recorded Investment Impaired Financing Receivable, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, Interest Income, Accrual Method Net Recorded Investment of the Impaired Loans Net Recorded Investment of the Impaired Loans Net Recorded Investment of the Impaired Loans Time Deposits, Fiscal Year Maturity [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 Total Time Deposits Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block]