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] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Total investment securities available for sale Available-for-sale Securities [Member] Derivative Financial Instruments Derivatives [Member] Derivatives. Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Ending Balance Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Beginning Balance Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Mortgage derivative loss Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Net Mortgage Derivative Gain (Loss) Included In Earnings Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Net Mortgage Derivative Gain (Loss) Included In Earnings. Ending Balance Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Summary of core deposit intangibles and other intangibles Schedule of Finite-Lived Intangible Assets [Table Text Block] Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance Summary Of Changes In Balance Of Mortgage Servicing Rights Asset And Mortgage Servicing Rights Valuation Allowance [Table Text Block] Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance. Summary of estimated future amortization expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [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] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Line Items] Business Acquisition [Line Items] Goodwill acquired during period Goodwill, Acquired During Period Additions to finite-lived intangible assets Finite-lived Intangible Assets Acquired Number of Acquisitions Number of Acquisitions Number of Acquisitions Goodwill Goodwill Commitments and Contingencies Disclosure [Abstract] Summary of lending-related and other commitments Lending Related And Other Commitments [Table Text Block] Lending related and other commitments. Summary of changes in the residential mortgage repurchase reserve Schedule of Representation and Warranty Reserve [Table Text Block] Schedule of Representation and Warranty Reserve [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] US Treasury Securities US Treasury Securities [Member] FNMA / FHLMC Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] GNMA Ginnie Mae [Member] Ginnie Mae [Member] Private Label Mortgage-backed Securities, Issued by Private Enterprises [Member] GNMA Commercial Mortgage-Related Securities Commercial Mortgage Backed Securities [Member] Other Debt And Other Equity Securities Other Debt And Other Equity Securities [Member] Other debt and other equity securities. Residential Loans Held For Sale Member Residential Loans Held For Sale Member [Member] Residential Loans Held For Sale Member Interest rate-related instruments — customer and mirror Interest Rate Related Instruments Customer and Mirror [Member] Interest rate related instruments customer and mirror. Foreign currency exchange forwards Foreign Exchange Forward [Member] Interest rate lock commitments (mortgage) Interest Rate Lock Commitments [Member] Forward commitments (mortgage) Forward Contracts [Member] Commodity contracts Commodity Contract [Member] Purchased options (time deposit) Written Deposit Options [Member] Written deposit option with an equity indexed derivative 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] Assets, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Investment securities available for sale: Available-for-sale Securities [Abstract] Investment securities available for sale Available-for-sale Securities Trading assets Derivative Asset Liabilities, Fair Value Disclosure [Abstract] Liabilities, Fair Value Disclosure [Abstract] Trading liabilities Derivative Liability Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net Income (Loss) Attributable to Parent 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] Provision for credit losses Provision for Loan, Lease, and Other Losses Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Addition to 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 of Intangible Assets Amortization and accretion on earning assets, funding, and other, net Accretion (Amortization) of Discounts and Premiums, Investments Tax impact of stock based compensation Deferred Tax Expense from Stock Options Exercised Gain on sales of investment securities, net Marketable Securities, Gain (Loss) Asset (gains) losses, net Gain (Loss) on Disposition of Assets for Financial Service Operations Gain 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 Increase in interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Decrease in interest payable Increase (Decrease) in Interest Payable, Net Commercial loans held for sale Increase (Decrease) in Loans Held-for-sale Other, net 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 Other assets Payments to Acquire Other Productive Assets Proceeds from: Proceeds from Investing Activities [Abstract] Sales of available for sale securities Proceeds from Sale of Available-for-sale Securities Proceeds from Sale of Federal Home Loan Bank Stock 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 Available-for-sale Securities 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 cash paid 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 decrease in deposits Increase (Decrease) in Deposits Net increase (decrease) in short-term funding Proceeds from (Repayments of) Short-term Debt 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 common stock for stock-based compensation plans Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Purchase of preferred stock 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 for tax withholding 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 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 disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid, Net Cash paid for income 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 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 Investments, Debt and Equity Securities [Abstract] 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 and FHLMC Fannie Mae and Freddie Mac [Member] Fannie Mae and Freddie Mac [Member] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Residential Related Securities Residential Mortgage Backed Securities [Member] Equity Securities [Member] Equity Securities [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] Available for Sale Available-for-sale Securities, Debt Maturities [Abstract] Amortized Cost Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Available for Sale, Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Available for Sale, Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Available for Sale, Due after five years through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Available for Sale, Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Available for Sale, Total debt securities Available-for-sale Debt Securities, Amortized Cost Basis Investment securities available for sale, amortized cost Available-for-sale Securities, Amortized Cost Basis Fair Value Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] Available for Sale, Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Available for Sale, Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Available for Sale, Due after five years through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Available for Sale, Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Available for Sale, Total debt securities Available-for-sale Securities, Debt Securities Investment securities available for sale, at fair value Ratio of Fair Value to Amortized Cost Ratio of Fair Value to Amortized Cost, AFS Ratio of Fair Value to Amortized Cost, AFS Held to Maturity Held-to-maturity Securities, Debt Maturities [Abstract] Amortized Cost Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Held to Maturity, Due in one year or less Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount Held to Maturity, Due after one year through five years Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount Held to Maturity, Due after five years through ten years Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount Held to Maturity, Due after ten years Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount Held to Maturity, Debt Securities, Amortized Cost Basis Held-to-maturity Debt Securities, Amortized Cost Basis Held-to-maturity Debt Securities, Amortized Cost Basis Held to Maturity Amortized Cost Held-to-maturity Securities Fair Value Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract] Held to Maturity, Due in one year or less Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value Held to Maturity, Due after one year through five years Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value Held to Maturity, Due after five years through ten years Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value Held to Maturity, Due after ten years Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value Held to Maturity, Securities, Debt Securities Held-to-maturity Securities, Debt Securities Held-to-maturity Securities, Debt Securities Held to Maturity, Total debt securities Held-to-maturity Securities, Fair Value Ratio of Fair Value to Amortized Cost Ratio of Fair Value to Amortized Cost, HTM Ratio of Fair Value to Amortized Cost, HTM Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] 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] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Purchased options (time deposit) Purchased Deposit Option [Member] A purchased deposit option with an equity indexed derivative Written options (time deposit) 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 Receivables [Abstract] Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Income Statement [Abstract] 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 long-term funding Interest Expense, Long-term Debt Total interest expense Interest Expense NET INTEREST INCOME Interest Income (Expense), Net Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss NONINTEREST INCOME Noninterest Income [Abstract] Trust service fees Fees and Commissions, Fiduciary and Trust Activities Service charges on deposit accounts Fees and Commissions, Depositor Accounts Card-based and other nondeposit fees Card Based And Other Nondeposit Fees Card based and other non deposit fees. Insurance commissions Insurance Commissions and Fees Brokerage and annuity commissions Brokerage Commissions Revenue Mortgage banking, net Fees and Commissions, Mortgage Banking and Servicing Capital market fees, net Capital Market Fees Net Capital market fees, net. Bank owned life insurance income Bank Owned Life Insurance Income Asset gains (losses), net Investment securities gains, net Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments Other Noninterest Income, Other Operating Income Total noninterest income Noninterest Income NONINTEREST EXPENSE Noninterest Expense [Abstract] Personnel expense Labor and Related Expense Occupancy Occupancy, Net Equipment Equipment Expense Technology Information Technology and Data Processing Business development and advertising Marketing and Advertising Expense Other intangible amortization Loan expense Loan Expense Loan Expense Legal and professional fees Legal And Professional Fees Legal and professional fees. Foreclosure / OREO expense Foreclosed Real Estate Expense FDIC expense Federal Deposit Insurance Corporation Premium Expense 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 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 (in usd per share) Earnings Per Share, Basic Diluted (in usd per share) Earnings Per Share, Diluted Average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Earnings Per Common Share Earnings Per Share [Text Block] Schedule Of Financing Receivable Restructuring [Table] Schedule Of Financing Receivable Restructuring [Table] Financing Receivable Restructurings [Axis] Financing Receivable Restructurings [Axis] Financing Receivable Restructurings [Domain] Financing Receivable Restructurings [Domain] Financing Receivable Restructurings [Domain] Commercial and industrial Commercial Portfolio Segment [Member] Commercial real estate — owner occupied Commercial Real Estate Owner Occupied Portfolio [Member] Commercial real estate owner occupied residential loans Commercial real estate — investor Commercial Real Estate Investor Portfolio Segment [Member] Commercial real estate - investor loans. Real estate construction Construction Loans [Member] Residential mortgage Residential Portfolio Segment [Member] Home equity Home Equity Port Folio Segments [Member] Home equity portfolio segments. Other consumer Other consumer [Member] Installment. Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Performing Restructured Loans Performing Restructured Loans Restructured loans that are accruing Nonaccrual Restructured Loans Nonaccrual Restructured Loans Restructured loans that are on nonaccrual Investment securities and cash equivalents pledged as collateral Additional Collateral, Aggregate Fair Value Derivative collateral right to reclaim cash Derivative, Collateral, Right to Reclaim Cash New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Summary of Significant Accounting Policies New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Investment securities available for sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Investment securities held to maturity Held-to-maturity Securities [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] Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings Commitments and Contingencies Disclosure [Text Block] Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance Summary Of Changes In Balance Of Mortgage Servicing Rights Asset And Mortgage Servicing Rights Valuation Allowance [Abstract] Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance. Mortgage servicing rights: Servicing Asset at Fair Value, Amount [Roll Forward] Mortgage servicing rights at beginning of period Servicing Asset at Amortized Cost Additions Servicing Asset at Amortized Cost, Additions Amortization Servicing Asset at Amortized Cost, Amortization Mortgage servicing rights at end of period Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward] Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward] Valuation allowance at beginning of period Valuation Allowance for Impairment of Recognized Servicing Assets, Balance (Additions) recoveries, net Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries) Valuation allowance at end of period Mortgage servicing rights, net Servicing Asset At Amortized Value Net Net amortized carrying amount (balance) as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs and allowances related to servicing arrangements. Fair value of mortgage servicing rights Servicing Asset at Amortized Cost, Fair Value Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) Portfolio Of Residential Mortgage Loans Serviced For Others Portfolio of residential mortgage loans serviced for others ("servicing portfolio"). Mortgage servicing rights, net to servicing portfolio Mortgage Servicing Rights Net To Servicing Portfolio Mortgage servicing rights, net to servicing portfolio. Mortgage servicing rights expense Mortgage Servicing Rights Expense Includes the amortization of mortgage servicing rights and additions/recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net in the consolidated statements of income. Compensation and Retirement Disclosure [Abstract] Fair value assumptions of stock options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of Company's Stock Option Activities Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of Restricted Stock Awards Activity (Excluding Salary Shares) Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Measurements, Nonrecurring [Member] Assets and Liabilities Measured at Fair Value on a Non-recurring Basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Commercial Loans Held-for-sale, Fair Value Disclosure Commercial Loans Held-for-sale, Fair Value Disclosure Fair value portion of loans held-for-sale for commercial finance receivables. Provision for Credit Losses, Commercial Loans held-for-sale Provision for Credit Losses, Commercial Loans held-for-sale Provision for Credit Losses, Commercial Loans held-for-sale Residential Held-for-sale, Fair Value Disclosure Mortgages Held-for-sale, Fair Value Disclosure Mortgage banking, net market valuation adjustment, mortgage loans held for sale A market valuation adjustment is recognized in income when the cost exceeds the estimated fair value. Impaired loans Loans Receivable, Fair Value Disclosure Provision for Credit Losses, Impaired Loans Provision for Credit Losses, Impaired Loans Provision for Credit Losses, Impaired Loans Other Real Estate Owned Fair Value Disclosure Other Real Estate Owned Fair Value Disclosure Other real estate owned fair value disclosure. Foreclosure / OREO expense, net SEC Schedule III, Real Estate, Write-down or Reserve, Amount Mortgage servicing rights Mortgage Servicing Rights (MSR) Impairment (Recovery) 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] 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. Summary Of Other derivative instruments not designated as hedging instruments Summary Of Other Derivative Instruments Not Designated As Hedging Instruments [Table Text Block] [Table Text Block] Summary Of Other Derivative Instruments Not Designated As Hedging Instruments [Table Text Block] [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. Obligations of state and political subdivisions (municipal securities) US States and Political Subdivisions Debt 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] 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] Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] Unrealized losses on held to maturity securities, less than 12 months Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Unrealized losses on held to maturity securities, 12 months or more Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total unrealized losses on held to maturity securities Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss 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, less than 12 months Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Fair value of unrealized losses on held to maturity securities, 12 months or more Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total fair value of unrealized losses on held to maturity securities Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 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 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 Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Corporate and Commercial Specialty Commercial Banking Segment [Member] Corporate and Commercial Specialty Community, Consumer, and Business Community, Consumer, and Business [Member] Community, Consumer, and Business segment Risk Management and Shared Services Risk Management and Shared Serivies [Member] Risk Management and Shared Serivies Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Segment Income Statement Data Abstract Segment Reporting Information, Profit (Loss) [Abstract] Net interest income Noninterest income Total revenue Revenues Credit provision Noninterest expense Income (loss) before income taxes Income tax expense (benefit) Return on average allocated capital (ROCET1) 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 (CET1) Average allocated capital Average allocated tier 1 common equity Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Preferred Equity Preferred Stock [Member] Common Stock Common Stock [Member] Surplus Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Treasury Stock Treasury Stock [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance Stockholders' Equity Attributable to Parent Comprehensive income: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Net income Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Common stock issued: Common Stock Issued [Abstract] Common stock issued. Stock-based compensation plans, net Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Purchase of common stock returned to authorized but unissued Stock Repurchased and Retired During Period, Value Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Cash dividends: Dividends [Abstract] Common stock dividends ($0.11 per share in 2016 and $0.12 per share in 2017) Dividends, Common Stock, Cash Preferred stock dividends Dividends, Preferred Stock, Cash Purchase of preferred stock Stock Repurchased During Period, Value Stock-based compensation expense, net Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Tax impact of stock-based compensation Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Other Stockholders' Equity, Other Ending balance 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] Real estate construction Number of Loans Financing Receivable, Modifications, Subsequent Default, Number of Contracts Recorded Investment Financing Receivable, Modifications, Subsequent Default, Recorded Investment Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Core Deposit Intangibles Core Deposits [Member] Other Intangible Assets Other Intangible Assets [Member] Mortgage Servicing Rights Mortgage Service Rights [Member] Mortgage service rights. Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Estimated future amortization expense Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Nine months ending December 31, 2017 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Year ending December 31, 2018 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Year ending December 31, 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two Year ending December 31, 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three Year ending December 31, 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four Year ending December 31, 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Beyond 2022 Finite-Lived Intangible Assets, Amortization Expense, after Year Five Total Estimated Amortization Expense Finite-Lived Intangible Assets, Net Assets and Liabilities Measured on Recurring Basis at Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Assets and Liabilities Measured on Nonrecurring Basis at Fair Value Fair Value Measurements, Nonrecurring [Table Text Block] Estimated fair values of financial instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Debt Disclosure [Abstract] Short-term Funding [Abstract] Short-term Debt [Abstract] Federal funds purchased Federal Funds Purchased Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase Federal funds purchased and securities sold under agreements to repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase FHLB advances Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months Commercial paper Commercial Paper Other short-term funding Other Short-term Borrowings Total short-term funding Short-term Debt Long-term Funding Long-term Debt, Unclassified [Abstract] FHLB advances Advances from Federal Home Loan Banks Senior notes, at par Senior Notes Subordinated notes, at par Subordinated Debt Other long-term funding and capitalized costs Other Long-term Debt and Capitalized Costs Other Long-term Debt and Capitalized Costs Total long-term funding Long-term Debt Total short and long-term funding Debt, Long-term and Short-term, Combined Amount Offsetting [Abstract] Offsetting Assets [Table] Offsetting Assets [Table] Interest and commodity agreements Interest Rate Contract [Member] Offsetting Assets [Line Items] Offsetting Assets [Line Items] Offsetting Derivative Assets [Abstract] Offsetting Derivative Assets [Abstract] Gross amounts recognized Derivative Asset, Fair Value, Gross Asset Gross amounts offset in the balance sheet Derivative Asset, Fair Value, Gross Liability Net amounts presented in the balance sheet Derivative Asset, Fair Value, Amount Not Offset Against Collateral Financial instruments Derivative, Collateral, Obligation to Return Securities Collateral Derivative Asset, Fair Value of Collateral Net amount Derivative Asset, Fair Value, Amount Offset Against Collateral Offsetting Liabilities [Table] Offsetting Liabilities [Table] Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] Offsetting Derivative Liabilities [Abstract] Offsetting Derivative Liabilities [Abstract] Gross amounts recognized Derivative Liability, Fair Value, Gross Liability Gross amounts offset in the balance sheet Derivative Liability, Fair Value, Gross Asset Net amounts presented in the balance sheet Derivative Liability, Fair Value, Amount Not Offset Against Collateral Financial instruments Derivative, Collateral, Right to Reclaim Securities Collateral Derivative Liability, Fair Value of Collateral Net amount Derivative Liability, Fair Value, Amount Offset Against Collateral Balance Sheet Offsetting of Derivative Assets and Liabilities Balance Sheet Offsetting of Derivative Assets and Liabilities [Table Text Block] Financial assets and liabilities offset on the Balance Sheet or subject to master netting agreements. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Estimated fair values of financial instruments Fair Value Financial Instruments By Balance Sheet Grouping [Abstract] Fair value financial instruments by balance sheet grouping. Financial assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and due from banks Cash and Due from Banks Cash and due from banks, Fair Value Cash and Cash Equivalents, Fair Value Disclosure Interest-bearing deposits in other financial institutions Interest-bearing Deposits in Banks and Other Financial Institutions Interest-bearing deposits in other financial institutions, fair value Interest Bearing Deposits In Banks Fair Value Disclosure Interest bearing deposits in banks fair value disclosure. Federal funds sold and securities purchased under agreements to resell Federal Funds Sold and Securities Purchased under Agreements to Resell Federal funds sold and securities purchased under agreements to resell, fair value Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure Investment securities held to maturity Investment securities held to maturity, fair value Investment securities available for sale, at fair value Available-for-sale Securities1 This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. FHLB and Federal Reserve Bank stocks Federal Home Loan Bank Stock and Federal Reserve Bank Stock Federal Home Loan Bank and Federal Reserve Bank stocks, fair value Federal Home Loan Bank And Federal Reserve Bank Stocks Fair Value Disclosure Federal Home Loan Bank And Federal Reserve Bank Stocks Fair Value Disclosure. 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. Residential Loans on Real Estate, Carrying Amount of Mortgages Mortgage Loans on Real Estate, Carrying Amount of Mortgages Loans, net Loans and Leases Receivable, Net Amount Loans, net, fair value Loans Receivable Net Fair Value Disclosure Loans Receivable Net Fair Value Disclosure. Bank owned life insurance Bank Owned Life Insurance Bank owned life insurance, fair value Bank Owned Life Insurance Fair Value Disclosure Bank owned life insurance fair value disclosure. Derivatives (trading and other assets) Derivatives (trading and other assets), fair value Financial liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Deposits Excluding Time Deposits Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value Deposits Excluding Time Deposits Fair Value Disclosure Fair Value of noninterest-bearing demand, savings, interest-bearing demand, and money market deposits Brokered CDs and other time deposits Brokered cds and other time deposits Brokered cds and other time deposits Brokered CDs and other time deposits, fair value Brokered cds and other time deposits fair value Brokered cds and other time deposits fair value Short-term funding Short-term funding, fair value Short-term Debt, Fair Value Long-term funding Long-term funding, fair value Long-term Debt, Fair Value Standby letters of credit Long-term Line of Credit Standby letters of credit, fair value Lines of Credit, Fair Value Disclosure Derivatives (trading and other liabilities) Derivatives (trading and other liabilities), fair value Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Calculations for basic and diluted earnings per common share Earnings Per Share, Basic and Diluted [Abstract] Preferred stock dividends Common shareholder dividends Dividends, Common Stock Unvested share-based payment awards Unvested Share based Payment Awards Unvested Share based Payment Awards. Undistributed earnings Undistributed Earnings, Basic Undistributed earnings allocated to common shareholders Undistributed Earnings Allocated To Common Shareholders Undistributed earnings allocated to common shareholders Undistributed earnings allocated to unvested share-based payment awards Undistributed Earnings Allocated To Unvested Share Based Payment Awards Undistributed Earnings Allocated To Unvested Share-Based Payment Awards Undistributed earnings UndistributedEarningsAllocations UndistributedEarningsAllocations Basic Earnings Per Share, Basic [Abstract] Distributed earnings to common shareholders Distributed Earnings To Common Shareholders Basic Distributed earnings to common shareholders basic. Undistributed earnings allocated to common shareholders Undistributed Earnings Basic Undistributed Earnings Basic. Total common shareholders earnings, basic Common Shareholders Earnings Basic Common Shareholders Earnings Basic. Diluted Earnings Per Share, Diluted [Abstract] Distributed earnings to common shareholders Distributed Earnings To Common Shareholders Diluted Distributed earnings to common shareholders diluted. Undistributed earnings allocated to common shareholders Undistributed Earnings, Diluted Total common shareholders earnings, diluted Common Shareholders Earnings Diluted Common Shareholders Earnings Diluted. Weighted average common shares outstanding (in shares) Effect of dilutive common stock awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Diluted weighted average common shares outstanding (in shares) Basic earnings (loss) per common share (in usd per share) Diluted earnings (loss) per common share (in usd per share) Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] Net period benefit cost for the pension and postretirement plans Schedule of Net Benefit Costs [Table Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Investments Securities Available For Sale Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Defined Benefit Pension and Post Retirement Obligations Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, before Tax Investment securities gain, net Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Personnel expense Interest income (Amortization of net unrealized gains (losses) on available for sale securities transferred to held to maturity securities) Amortization of Net Unrealized Gain on Available-for-Sale Securities Transfered to Held-to-maturity Securities Amortization of Net Unrealized Gain on Available-for-Sale Securities Transfered to Held-to-maturity Securities Income tax (expense) benefit Other Comprehensive Income (Loss), Tax Total other comprehensive income (loss) Ending Balance 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 and business lending Commercial And Business Lending [Member] Commercial and business lending Commercial real estate lending Commercial Real Estate Portfolio Segment [Member] Total commercial Residential mortgage Residential Mortgage [Member] Home equity Home Equity Line of Credit [Member] Other consumer 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 Loans and Leases Receivable, Net of Deferred Income Loan composition Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Commercial and consumer loans by credit quality indicator Financing Receivable Credit Quality Indicators [Table Text Block] Summarized details of Loans Past Due Financing Receivables [Table Text Block] Summarized details of impaired Loans Impaired Financing Receivables [Table Text Block] Nonaccrual and performing restructured loans Troubled Debt Restructurings Performing and Nonaccrual [Table Text Block] Troubled Debt Restructurings Performing and Nonaccrual [Table Text Block] Summary of restructured loans Troubled Debt Restructurings on Financing Receivables [Table Text Block] Troubled debt restructurings subsequent redefault Troubled Debt Restructurings Subsequent Default [Table Text Block] Table showing troubled debt restructurings that subsequently redefaulted during the period Changes in the allowance for loan losses by portfolio segment Allowance for Credit Losses on Financing Receivables [Table Text Block] Changes in the allowance for unfunded commitments Schedule Of Unfunded Commitments [Table Text Block] Schedule of allowance for loans and lease losses table text block. Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plan: Pension Plan [Member] Postretirement Plan: Other Postretirement Benefit Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Net period benefit cost for the pension and postretirement plans Defined Benefit Plan, Net Periodic Benefit Cost [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 on Plan Assets Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of actuarial loss Defined Benefit Plan, Amortization of Gains (Losses) Total net pension cost Defined Benefit Plan, Net Periodic Benefit Cost Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Unfunded Commitments: Reserve for Off-balance Sheet Activities [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Change in the allowance for unfunded commitments Movement in Valuation Allowances and Reserves [Roll Forward] Balance at beginning of period Valuation Allowances and Reserves, Balance Provision for unfunded commitments Provision for Other Credit Losses Balance at end of period Fair value assumptions of stock options Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Weighted average expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Weighted average expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Weighted average per share fair value of stock options (in usd per share) Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Per Share Fair Value Of Stock Options Per share fair value of stock options. Summary of Company's Stock Option Activities Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Stock Options Shares Outstanding, Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Stock Options Shares Outstanding, Ending balance (in shares) Options exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted, Weighted Average Exercise Price (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised, Weighted Average Exercise Price (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited or expired, Weighted Average Exercise Price (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Stock Options Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share) Options Exercisable, Weighted Average Exercise Price (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Stock Options Outstanding, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options exercisable, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Stock Options Outstanding, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options exercisable, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Detail Texuals) [Table] Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Detail Texuals) [Table] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] The Official Committee of Unsecured Creditors of World Marketing Chicago LLC v Associated Bank [Member] The Official Committee of Unsecured Creditors of World Marketing Chicago LLC v Associated Bank [Member] The Official Committee of Unsecured Creditors of World Marketing Chicago LLC v Associated Bank [Member] American Funds Service Company v Associated Bank [Member] American Funds Service Company v Associated Bank [Member] American Funds Service Company v Associated Bank [Member] Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items] Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities. unfunded commitments Carrying value of investments Other Investments Commitments under unconsolidated projects Commitments Under Unconsolidated Projects Commitments under unconsolidated projects. Commitment term Conciliation Agreement, Commitment Term Conciliation Agreement, Commitment Term Mortgage loan commitment Conciliation Agreement, Mortgage Loan Commitment Conciliation Agreement, Mortgage Loan Commitment Number of branch opening commitments Conciliation Agreement, Number of Branch Opening Commitments Conciliation Agreement, Number of Branch Opening Commitments Number of loan production offices Conciliation Agreement, Number of Loan Production Offices, Commitment Conciliation Agreement, Number of Loan Production Offices, Commitment Conciliation agreement cost, commitment term Conciliation Agreement Cost, Commitment Term Conciliation Agreement Cost, Commitment Term Number of complaints filed under legal proceedings Number of complaints filed under legal proceedings Number of complaints filed under legal proceedings Damages sought Loss Contingency, Damages Sought, Value Damages sought, cash Loss Contingency, Damages Sought, Value, Cash Loss Contingency, Damages Sought, Value, Cash Loans repurchased under make whole requests Loans Repurchased Under Make Whole Requests Loans repurchased under make whole requests Loans sold to outside investors original amount Loans Sold To Outside Investors Original Amount Loans sold to outside investors original amount Loans sold to outside investors remaining outstanding amount Loans Sold To Outside Investors Remaining Outstanding Amount Loans sold to outside investors remaining outstanding amount Residential mortgage loans sold with recourse risk Residential Mortgage Loans Sold With Recourse Risk Residential mortgage loans sold with recourse risk. Residential mortgage loans sold with credit recourse risk Residential Mortgage Loans Sold With Credit Recourse Risk Residential mortgage loans sold with credit recourse risk. Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Business Combinations [Abstract] Acquisitions Business Combination Disclosure [Text Block] Fair Value Measurements (Textuals) [Abstract] Fair Value Inputs, Quantitative Information [Abstract] Fair Value Measurements [Table] Fair Value Measurements [Table] Fair Value Measurements Table Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Fair Value of Assets and Liabilities [Line Items] Fair Value of Assets and Liabilities [Line Items] Line items represent fair values of assets and liabilities Closing ratio Fair Value Inputs Closing Ratio Represents the percentage of loans currently in a lock position which management estimates will ultimately close. Weighted average discount rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate Weighted average constant prepayment rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Commercial real estate lending Commercial Real Estate Lending [Member] Commercial real estate loans Total commercial Commercial Financing Receivable [Member] Commercial financing receivable member. Total consumer Consumer Loan [Member] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] 30-59 Days Past Due Financing Receivables, 30 to 59 Days Past Due [Member] 60-89 Days Past Due Financing Receivables, 60 to 89 Days Past Due [Member] 90 Days or More Past Due Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Summarized details of Loans Summarized Details Of Loans [Abstract] Summarized details of Loans. Current Financing Receivable, Recorded Investment, Current Total Past Due Financing Receivable, Recorded Investment, Past Due Nonaccrual Financing Receivable, Recorded Investment, Nonaccrual Status Total loans Accruing loans past due 90 days or more Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Nonaccrual Loans, Current Portion Nonaccrual Loans, Current Portion Nonaccrual Loans, Current Portion Percent of current nonaccrual loans Percent of current nonaccrual loans Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Commercial and business lending Home equity 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] 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 Balance Sheet Offsetting Balance Sheet Offsetting Disclosure [Text Block] Balance Sheet Offsetting Disclosure Amortized Cost 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 Investment securities held to maturity: Held-to-maturity Securities, Balance Sheet, Reported Amounts [Abstract] Amortized Cost Gross Unrealized Gains Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Gross Unrealized Losses Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Fair Value Earnings Per Share Textuals [Abstract] Earnings per share. Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Derivative and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase [Abstract] Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase [Abstract] RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Table] RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Table] Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Agency mortgage-related securities 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] RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items] [Line Items] for RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Table] Repurchase agreements Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Service-based Restricted Stock Award Service-based Restricted Stock Award [Member] Service-based Restricted Stock Award [Member] Performance-based Restricted Stock Award Performance-based Restricted Stock Award [Member] Performance-based Restricted Stock Award [Member] Employee Stock Option Employee Stock Option [Member] Restricted Stock Award Restricted Stock Award [Member] Restricted Stock Award. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 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 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. 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 Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Summary of Restricted Stock Awards Activity (Excluding Salary Shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, 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] Outstanding Shares, Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding Shares, Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Outstanding, Weighted Average Grant Date Fair Value, Beginning balance (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, Weighted Average Grant Date Fair Value (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested, Weighted Average Grant Date Fair Value (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited, Weighted Average Grant Date Fair Value (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Commercial and industrial Real estate construction Real Estate Construction Port Folio Segment [Member] Real estate construction portfolio segment. Other consumer Installment and Credit Cards Portfolio Segment [Member] Installment portfolio segment. Changes in the allowance for loan losses by portfolio segment Financing Receivable, Allowance for Credit Losses [Roll Forward] Balance at beginning of year Loans and Leases Receivable, Allowance Charge offs Allowance for Loan and Lease Losses, Write-offs Recoveries Allowance for Loan and Lease Loss, Recovery of Bad Debts Net charge offs Allowance for Loan and Lease Losses Write-offs, Net Provision for loan losses Provision for Loan and Lease Losses Balance at end of period Allowance for loan losses: Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Loans: Loans [Abstract] Loans. Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Statement of Comprehensive Income [Abstract] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Investment securities available for sale: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] Net unrealized gains Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Net unrealized losses on available for sale securities transferred to held to maturity securities Other Comprehensive Income (Loss), Transfers from Available-for-Sale Securities to Held-to-maturity, before Tax Other Comprehensive Income (Loss), Transfers from Available-for-Sale Securities to Held-to-maturity, before Tax Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities Reclassification adjustment for net gains realized in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Income tax (expense) benefit Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Other comprehensive income (loss) on investment securities available for sale Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Defined benefit pension and postretirement obligations: Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] Amortization of prior service cost Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax Amortization of actuarial losses Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax Income tax expense Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax Other comprehensive income (loss) on pension and postretirement obligations Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Summary of core deposit intangibles and other intangibles Finite-Lived Intangible Assets, Net [Abstract] Gross carrying amount Finite-Lived Intangible Assets, Gross Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Additions during the period Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] Gross gains Available-for-sale Securities, Gross Realized Gains Gross losses Available-for-sale Securities, Gross Realized Losses Total investment securities gains, net Proceeds from sales of securities Breakdown of short & long-term debt balances Schedule of Debt [Table Text Block] Remaining contractual maturity of securities sold under agreements to repurchase Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table Text Block] 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. Statement of Financial Position [Abstract] Preferred shares, par value Preferred Stock, Par or Stated Value Per Share Common shares, par value Common Stock, Par or Stated Value Per Share 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 Financing Receivable, Modifications, Post-Modification Recorded Investment Unpaid Principal Balance Financing Receivable, Modifications, Pre-Modification Recorded Investment Calculations for basic and diluted earnings per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting Segment Reporting Disclosure [Text Block] Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] 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] Reduction in Taxes Reduction in Taxes [Member] Summary of Significant Accounting Policies [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Capital market fees, net Capital Market Fees [Member] Capital market fees. Mortgage banking, net Mortgage Banking [Member] Mortgage banking. 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 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 Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Subordinated Borrowing [Table] Subordinated Borrowing [Table] Debt Instrument [Axis] Subordinated Borrowing [Axis] Debt Instrument, Name [Domain] Subordinated Borrowing, Name [Domain] Two Thousand Fourteen Senior Notes Two Thousand Fourteen Senior Notes [Member] Two Thousand Fourteen Senior Notes [Member] Two Thousand Fourteen Subordinated Notes Two Thousand Fourteen Subordinated Notes [Member] Two Thousand Fourteen Subordinated Notes [Member] Subordinated Borrowing [Line Items] Subordinated Borrowing [Line Items] Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed Federal Home Loan Bank, Advances, Weighted Average Interest Rate Federal Home Loan Bank, Advances, Weighted Average Interest Rate 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 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 Schedule Of Financing Receivable Table [Table] Schedule Of Financing Receivable Table [Table] Schedule Of Financing Receivable Table [Table] Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Selected segment information Schedule of Segment Reporting Information, by Segment [Table Text Block] Investment Securities (Textuals) [Abstract] Investment Securities Textuals [Abstract] Investment securities. Available-for-sale Securities, Transferred to Held-to-maturity Securities, at Carrying Value Available-for-sale Securities, Transferred to Held-to-maturity Securities, at Carrying Value For any transfer of securities categorized as available-for-sale, this item represents the net carrying amount of the transferred security to another category of investments in debt and equity securities (trading or held-to-maturity). Securities pledged as collateral Available-for-sale Securities Pledged as Collateral Federal Home Loan Bank Stock Federal Home Loan Bank Stock Federal Reserve Bank Stock Federal Reserve Bank Stock 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 Valuation Allowances and Reserves, Additions for Charges to Cost and Expense Adjustments to provision expense Valuation Allowances and Reserves, Period Increase (Decrease) Charge offs, net Valuation Allowances and Reserves, Deductions Common stock dividends (usd per share) Common Stock, Dividends, Per Share, Cash Paid Short and Long-Term Funding Debt Disclosure [Text Block] ASSETS Assets [Abstract] Investment securities held to maturity, at amortized cost Federal Home Loan Bank and Federal Reserve Bank stocks, at cost 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. Loans Allowance for loan losses Loans, net Premises and equipment, net Property, Plant and Equipment, Net Mortgage servicing rights Servicing Asset Other intangible assets Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets Total assets Assets LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Noninterest-bearing demand deposits Noninterest-bearing Domestic Deposit, Demand Interest-bearing deposits Interest-bearing Deposit Liabilities, Domestic Total deposits Deposits Federal funds purchased and securities sold under agreements to repurchase Other short-term funding Accrued expenses and other liabilities Other Liabilities Total liabilities Liabilities Stockholders’ equity 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 loss Treasury stock, at cost Treasury Stock, Value Total common equity Total Common Equity Total Common Equity Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Preferred shares issued (in shares) Preferred Stock, Shares Issued Preferred shares authorized (par value $1.00 per share) (in shares) Preferred Stock, Shares Authorized Common shares issued (in shares) Common Stock, Shares, Issued Common shares authorized (par value $0.01 per share) (in shares) Common Stock, Shares Authorized Treasury shares of common stock (in shares) Treasury Stock, Shares