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 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] 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 Derivative and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Segment Reporting [Abstract] Segment Reporting Segment Reporting Disclosure [Text Block] Investments, Debt and Equity Securities [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Collateral [Axis] Collateral [Axis] Collateral Collateral [Domain] Investment Securities Class Investment Securities Class [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Bank Mutual Bank Mutual [Member] Bank Mutual [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Debt Securities, Available-for-sale, Sold at Par Value Debt Securities, Available-for-sale, Sold at Par Value Investment Securities (Textuals) [Abstract] Investment Securities Textuals [Abstract] Investment securities. Pledged Financial Instruments, Not Separately Reported, Securities Pledged Financial Instruments, Not Separately Reported, Securities Available-for-sale Securities, Equity Securities Available-for-sale Securities, Equity Securities Visa Restricted Stock Owned Visa Restricted Stock Owned Visa Restricted Stock Owned Federal Home Loan Bank Stock Federal Home Loan Bank Stock Federal Reserve Bank Stock Federal Reserve Bank Stock Derivative Impact on Performance [Table] Derivative Impact on Performance [Table] Derivative Impact on Performance [Table] Capital Market Fees [Member] Capital Market Fees [Member] Capital market fees. Mortgage Banking [Member] Mortgage Banking [Member] Interest Rate Related Instruments Customer and Mirror [Member] Interest Rate Related Instruments Customer and Mirror [Member] Interest rate related instruments customer and mirror. Foreign Exchange Forward [Member] Foreign Exchange Forward [Member] Commodity Contract [Member] Commodity Contract [Member] Interest Rate Lock Commitments [Member] Interest Rate Lock Commitments [Member] Forward Contracts [Member] Forward Contracts [Member] Derivative Impact on Performance [Line Items] Derivative Impact on Performance [Line Items] [Line Items] for Derivative Impact on Performance [Table] Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Earnings Per Share [Abstract] Earnings Per Common Share Earnings Per Share [Text Block] Leases [Abstract] Leases Leases of Lessee Disclosure [Text Block] 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] Debt Disclosure [Abstract] 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] FHLB Maturity FHLB_Maturity_ [Table Text Block] [Table Text Block] for FHLB_Maturity_ [Table] Offsetting [Abstract] 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. Commitments and Contingencies Disclosure [Abstract] Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters Commitments and Contingencies Disclosure [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Summary of Significant Accounting Policies New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] 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 MSR Addition from Business Combination MSR Addition from Business Combination MSR Addition from Business Combination 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. 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 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] Retirement Benefits [Abstract] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Detail Texuals) [Table] Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Detail Texuals) [Table] 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. Standby Letters of Credit Standby Letters of Credit [Member] Investment Secondary Categorization [Axis] Investment Secondary Categorization [Axis] Investments by Secondary Categorization [Domain] Investments by Secondary Categorization [Domain] UnconsolidatedProjectsLowIncomeHousing [Member] UnconsolidatedProjectsLowIncomeHousing [Member] UnconsolidatedProjectsLowIncomeHousing [Member] Low-income housing, new market tax credits projects and historic tax credit projects. PrincipalInvestmentCommitment [Member] PrincipalInvestmentCommitment [Member] PrincipalInvestmentCommitment [Member] Provided to capital based financing to private and public companies 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. Lines of Credit, Fair Value Disclosure Lines of Credit, Fair Value Disclosure Unfunded Commitments SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Other Investments Other Investments Expense Related to Qualified Affordable Housing Projects Expense Related to Qualified Affordable Housing Projects Expense Related to Qualified Affordable Housing Projects Remaining Investment in Qualified Affordable Housing Projects Remaining Investment in Qualified Affordable Housing Projects Remaining Investment in Qualified Affordable Housing Projects Variable Interest Entity Reporting Entity Involvement Unfunded Obligation Amount Variable Interest Entity Reporting Entity Involvement Unfunded Obligation Amount Variable Interest Entity Reporting Entity Involvement Unfunded Obligation Amount Loans Repurchased Under Make Whole Requests Loans Repurchased Under Make Whole Requests Loans repurchased under make whole requests Loans Sold To Outside Investors Loss ReimbursementSettlement Paid Loans Sold To Outside Investors Loss ReimbursementSettlement Paid Loans Sold To Outside Investors Loss ReimbursementSettlement Paid 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. 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 Relationship to Entity [Domain] Plan Name [Axis] Plan Name [Axis] Plan Name Plan Name [Domain] Award Type [Axis] Award Type [Axis] Equity Award 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. Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Share-based Compensation Arrangement by Share-based Payment Award Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 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 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 Recognized compensation expense for vesting of stock options Allocated Share-based Compensation Expense Recognized compensation expense for accelerated vesting of stock options String_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost String_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost Unvested share-based payment awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Remaining requisite service periods, extend through 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 Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Recognized compensation expense for accelerated vesting of restricted stock options Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost 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 Corporate and Commercial Specialty [Member] Corporate and Commercial Specialty [Member] Community, Consumer, and Business Community, Consumer and Business [Member] Community, Consumer and Business [Member] Risk Management and Shared Services 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 Insurance Commissions and Fees [Member] Insurance Commissions and Fees [Member] Wealth management fees Fiduciary and Trust [Member] Service charges and deposit account fees Deposit Account [Member] Card-based fees(a) Credit and Debit Card [Member] Other revenue Financial Service, Other [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Noninterest Income In Scope of Topic 606 Noninterest Income In Scope of Topic 606 Noninterest Income In Scope of Topic 606 Other revenue Noninterest Income, Outside of Scope of Topic 606 Noninterest Income, Outside of Scope of Topic 606 Total noninterest income Noninterest Income Receivables [Abstract] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [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 Lending [Member] Commercial real estate loans Total commercial Commercial Financing Receivable [Member] Commercial financing receivable member. Residential mortgage Residential Mortgage [Member] Home equity Home Equity Line of Credit [Member] Other consumer Other consumer [Member] Installment. 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 Loans and Leases Receivable, Net of Deferred Income Nonaccrual Loans, Current Portion Nonaccrual Loans, Current Portion Nonaccrual Loans, Current Portion Percent of current nonaccrual loans Percent of current nonaccrual loans 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] 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] Additions to Core Deposits Adjustments to Core Deposits [Member] Adjustments to Core Deposits [Member] Other Intangibles Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Summary of core deposit intangibles and other intangibles Finite-Lived Intangible Assets, Net [Abstract] Gross carrying amount Finite-Lived Intangible Assets, Gross Reductions due to sale Finite-Lived Intangible Assets, Period Increase (Decrease) Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Book Value Finite-Lived Intangible Assets, Net Additions during the period Finite-lived Intangible Assets Acquired Amortization of other intangible assets Amortization of Intangible Assets Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Commercial real estate lending Commercial Real Estate Portfolio Segment [Member] Total commercial Commercial Portfolio Segment [Member] 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 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] Residential Related Securities Residential Mortgage Backed Securities [Member] Private-label Mortgage-backed Securities, Issued by Private Enterprises [Member] Commercial mortgage-related securities Commercial Mortgage Backed Securities [Member] FFELP asset backed securities Federal Family Education Loan Program (FFELP) Guaranteed Loans [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 Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] Available for Sale, Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Available for Sale, Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Available for Sale, Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Available for Sale, Due after ten years Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost Available for Sale, Total debt securities Debt Securities, Available-for-sale, Amortized Cost Available for Sale, amortized cost Available-for-sale Securities, Amortized Cost Basis Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Available for Sale, Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Available for Sale, Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Available for Sale, Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Available for Sale, Due after ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Available for Sale, Total debt securities Debt Securities, Available-for-sale Investment securities available for sale, at fair value Available-for-sale Securities Available for Sale, 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 Debt Securities, Held-to-maturity, Maturity [Abstract] Amortized Cost Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] Held to Maturity, Due in one year or less Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Held to Maturity, Due after one year through five years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Held to Maturity, Due after five years through ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Held to Maturity, Due after ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost Held to Maturity, Total Debt Securities Held-to-maturity Debt Securities, Amortized Cost Basis Held-to-maturity Debt Securities, Amortized Cost Basis Held to Maturity, Amortized Cost Debt Securities, Held-to-maturity Fair Value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Held to Maturity, Due in one year or less Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Held to Maturity, Due after one year through five years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Held to Maturity, Due after five years through ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Held to Maturity, Due after ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 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 at fair value Debt Securities, Held-to-maturity, Fair Value Held to Maturity, Ratio of Fair Value to Amortized Cost Ratio of Fair Value to Amortized Cost, HTM Ratio of Fair Value to Amortized Cost, HTM Recorded Investment, loans modified in troubled debt restructuring 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 Net unaccreted purchase discount UnaccretedPurchaseDiscount UnaccretedPurchaseDiscount Unaccreted purchase discount, performing loans UnaccretedPurchaseDiscount_PerformingLoans Unaccreted Purchase Discount Performing Loans Unaccreted purchase discount, nonperforming loans UnaccretedPurchaseDiscount_NonPerformingLoans Unaccreted Purchase Discount NonPerforming Loans Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Bank Mutual Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Purchased credit-impaired 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. 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] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Operating lease terms Lessee, Operating Lease, Term of Contract Operating Lease, Cost Operating Lease, Cost Operating Lease, Payments Operating Lease, Payments Additional operating leases Lessee, Operating Lease, Lease Not yet Commenced, Liability Lessee, Operating Lease, Lease Not yet Commenced, Liability Additional operating lease terms Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] 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 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] Schedule Of Financing Receivable Table [Table] Schedule Of Financing Receivable Table [Table] Schedule Of Financing Receivable Table [Table] Real estate construction Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Total loans Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Statement [Line Items] Statement [Line Items] Common Stock, Dividends, Per Share, Cash Paid Common Stock, Dividends, Per Share, Cash Paid Cash dividends: Dividends [Abstract] 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 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 Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Balance Sheet Offsetting Balance Sheet Offsetting Disclosure [Text Block] Balance Sheet Offsetting Disclosure 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. 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, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Transfer of level 3 to level 2 based on new pricing information Fair Value, Assets, Level 3 to Level 2 Transfers, Amount Fair Value, Assets, Level 3 to Level 2 Transfers, Amount 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 Transfer out of level 3 securities 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 Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Equipment Equipment [Member] Retail and corporate offices Retail and Corporate Offices [Member] Retail and Corporate Offices [Member] Land Land [Member] Weighted-average lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent 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. Changes In accretable yield for purchased credit impaired asb_ScheduleOfChangesInAccretableYieldForPurchasedCreditImpairedLoansTableTextBlock [Table Text Block] asb_ScheduleOfChangesInAccretableYieldForPurchasedCreditImpairedLoansTableTextBlock [Table Text Block] 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 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] Other consumer Performing Restructured Loans Performing Restructured Loans Restructured loans that are accruing Nonaccrual Restructured Loans Nonaccrual Restructured Loans Restructured loans that are on nonaccrual Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Operating Segments 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] Number of Reportable Segments Number of Reportable Segments Segment Income Statement Data Abstract Segment Reporting Information, Profit (Loss) [Abstract] Net interest income Interest Income (Expense), Net 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 Provision for Loan, Lease, and Other Losses Noninterest Expense Noninterest Expense Income (loss) before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense (benefit) Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent Segment Balance Sheet Data Segment Balance Sheet Data [Abstract] Segment Reporting Information Allocated Goodwill - Segment Allocated Goodwill - Segment Allocated Goodwill - Segment Business Combination, Acquisition Related Costs Business Combination, Acquisition Related Costs Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Investment 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) AOCI 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 Debt Securities, Available-for-sale, Realized Loss Debt Securities, Available-for-sale, Realized Loss Personnel expense Labor and Related Expense Other Expenses Other Expenses Change in Equity Securities(2016-01) Change in Equity Securities(2016-01) Change in Equity Securities(2016-01) Reporting Comprehensive Income(2018-02) Reporting Comprehensive Income(2018-02) Reporting Comprehensive Income(2018-02) Interest income (amortization of net unrealized losses (gains) 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) Other Comprehensive Income (Loss), Net of Tax Ending Balance US Treasury Securities US Treasury Securities [Member] Obligations of state and political subdivisions (municipal securities) US States and Political Subdivisions Debt Securities [Member] Commercial mortgage-related securities Other Debt securities Debt Securities [Member] Investment securities available for sale: Debt Securities, Available-for-sale [Abstract] 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 Debt Securities, Held-to-maturity Debt Securities, Held-to-maturity [Abstract] Held to Maturity, Amortized Cost Held-to-maturity, 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 Held-to-maturity, Fair Value 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 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited 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 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 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 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) Interests Continued to be Held by Transferor in Financial Assets that It has Securitized or Servicing Assets or Liabilities Relating to Assets that It has Securitized [Abstract] Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table] Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Discounted Cash Flow Discounted Cash Flow [Member] Discounted Cash Flow [Member] Appraisals/Discounted Cash Flow Appraisals/Discounted Cash Flow [Member] Appraisals/Discounted Cash Flow [Member] Mortgage Servicing Rights Servicing Contracts [Member] Impaired Finance Receivable Impaired Finance Receivable [Member] Impaired Finance Receivable [Member] Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed Defined Benefit Plan, Contributions by Employer [Abstract] Defined Benefit Plan, Contributions by Employer [Abstract] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Bank Mutual Pension Plan Other Pension Plan [Member] RAP Pension Plan [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plan, Plan Assets, Contributions by Employer Defined Benefit Plan, Plan Assets, Contributions by Employer Estimated future amortization expense Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Nine Months Ending December 31, 2019 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Year ending December 31, 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Year ending December 31, 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two Year ending December 31, 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three Year ending December 31, 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four Year ending December 31, 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Five Beyond 2024 Finite-Lived Intangible Assets, Amortization Expense, after Year Five Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] FNMA / FHLMC Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [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 Commercial loans held for sale [Domain] Commercial loans held for sale [Domain] Commercial loans held for sale [Domain] Interest rate-related instruments — customer and mirror Foreign currency exchange forwards Interest rate lock commitments (mortgage) Forward commitments (mortgage) Commodity contracts 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 Trading assets Derivative Asset Interest Rate Fair Value Hedge Derivative at Fair Value, Net Interest Rate Fair Value Hedge Asset at Fair Value Liabilities, Fair Value Disclosure [Abstract] Liabilities, Fair Value Disclosure [Abstract] Trading liabilities Derivative Liability Short and Long-Term Funding Debt Disclosure [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] 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 Equity securities with readily determinable fair values Equity Securities, FV-NI 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 Held-for-sale, Fair Value Disclosure Fair value portion of loans held-for-sale for commercial finance receivables. Allowance for loan losses Loans and Leases Receivable, Allowance 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 Premises and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Other intangible assets, net 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 Federal Funds Purchased and Securities Sold under Agreements to Repurchase Commercial paper Commercial Paper FHLB advances Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances Other long-term funding Long-term Debt 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 income (loss) 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 Defined Benefit Plan [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Postretirement Plan Other Postretirement Benefits 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 (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 Defined Benefit Plan, Amortization of Gain (Loss) Total net pension and periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 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] 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 Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] 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] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] 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 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. Balance at end of period Schedule Of Lending Related And Other Commitments [Table] Schedule Of Lending Related And Other Commitments [Table] Schedule Of Lending Related And Other Commitments. 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. 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 Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Trading Assets [Member] Trading Assets [Member] Other Assets [Member] Other Assets [Member] Trading Liabilities [Member] Trading Liabilities [Member] Other Liabilities [Member] Other Liabilities [Member] 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, Fair Value Cash and Cash Equivalents, Fair Value Disclosure 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, fair value Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure Debt Securities, Held-to-maturity Investment securities held to maturity, fair value Investment securities available for sale, 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. Equity securities with readily determinable fair value, Carrying Amount Equity securities with readily determinable fair value, Carrying Amount Equity securities with readily determinable fair value, Carrying Amount Equity securities with readily determinable fair values, Fair Value FHLB and Federal Reserve Bank stocks FHLB 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. Residential Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Residential Held-for-sale, Fair Value Disclosure Mortgages Held-for-sale, 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. Commercial Loans Held-for-sale, Fair Value Disclosure Loans, net Loans, net, fair value Loans Receivable Net Fair Value Disclosure Loans Receivable Net Fair Value Disclosure. Bank and Corporate 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 assets) Derivatives (trading and other assets), fair value Derivative Asset, Fair Value, Gross Asset 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 Debt Short-term funding, fair value Short-term Debt, Fair Value Long-term funding, fair value Long-term Debt, Fair Value Standby letters of credit Long-term Line of Credit Derivatives (trading liabilities) Derivatives (trading and other liabilities), fair value Derivative Liability, Fair Value, Gross Liability Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Fair Value Measurements (Textuals) [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Abstract] Fair Value Inputs Closing Ratio Fair Value Inputs Closing Ratio Represents the percentage of loans currently in a lock position which management estimates will ultimately close. Net period benefit cost for the pension and postretirement plans Schedule of Net Benefit Costs [Table Text Block] Accounting Policies [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] AOCI Attributable to Parent [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Operating lease right-of-use asset Operating Lease, Right-of-Use Asset Operating lease liability Operating Lease, Liability Hedge impact on Financial Position [Abstract] Hedge impact on Financial Position [Abstract] Balance Sheet Recording of Fair Value Hedge [Table] Balance Sheet Recording of Fair Value Hedge [Table] Balance Sheet Recording of Fair Value Hedge [Table] Valuation [Axis] Valuation [Axis] Valuation [Axis] Valuation [Domain] Valuation [Domain] [Domain] for Valuation [Axis] Carrying Value [Member] Carrying Value [Member] Carrying Value [Member] adjustment [Member] adjustment [Member] adjustment [Member] Balance Sheet Recording of Fair Value Hedge [Line Items] Balance Sheet Recording of Fair Value Hedge [Line Items] [Line Items] for Balance Sheet Recording of Fair Value Hedge [Table] Carrying Amount of the Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Amortized cost basis of hedged asset Derivative Asset, Amortized Cost Basis Derivative Asset, Amortized Cost Basis Goodwill, Impairment Loss Goodwill, Impairment Loss Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, 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] FHLBDecreaseinAdvances [Domain] FHLBDecreaseinAdvances [Domain] FHLBDecreaseinAdvances [Domain] FLHB Advances, Putable [Domain] FLHB Advances, Putable [Domain] FLHB Advances, Putable [Domain] FHLB Short Term Advances [Member] FHLB Short Term Advances [Member] FHLB Short Term Advances [Member] FHLB Long Term Advances [Member] FHLB Long Term Advances [Member] FHLB Long Term Advances [Member] Long-Term Funding Debt Instrument [Line Items] New Senior Debt Issued New Senior Debt Issued New Senior Debt Issued Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances FHLB Put Contractual Maturity Weighted Average Life1 FHLB Put Contractual Maturity Weighted Average Life1 FHLB Put Contractual Maturity Weighted Average Life1 Subordinated Borrowing [Table] Subordinated Borrowing [Table] Debt Instrument [Axis] Subordinated Borrowing [Axis] Debt Instrument, Name [Domain] Subordinated Borrowing, Name [Domain] 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 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 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] Approximate anti-dilutive stock options 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 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 Commercial paper Total short-term funding Corporation senior notes [Member] Corporation senior notes [Member] Corporation senior notes [Member] Bank senior notes [Member] Bank senior notes [Member] Bank senior notes [Member] Senior notes, at par Senior Notes Corporation subordinated notes, at par, due 2025 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 Funding Long-term Debt, Unclassified [Abstract] Total short and long-term funding, excluding FHLB advances TotalShortTermLongTermExcludingFHLB Total Short Term Long Term Excluding FHLB FHLB Advances Advances from Federal Home Loan Banks [Abstract] Short-term FHLB advances ShortTermFHLBAdvances Short-Term FHLB Advances Long-term FHLB advances LongTermFHLBAdvances Long-Term FHLB Advances Total FHLB advances Total short and long-term funding, excluding FHLB advances Debt, Long-term and Short-term, Combined Amount 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 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 (losses), net Debt Securities, Realized Gain (Loss) Proceeds from sales of investment securities Proceeds from Sale and Maturity of Marketable Securities Revenue from Contracts with Customers Revenue from Contract with Customer [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] 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 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] 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, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount Mortgage servicing rights Mortgage Servicing Rights (MSR) Impairment (Recovery) Mortgage Servicing Rights (MSR) Impairment (Recovery) Statement of Comprehensive Income [Abstract] Net income Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Investment securities available for sale Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract] Net unrealized gains (losses) Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Net unrealized gain (loss) 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 gain (loss) on available for sale securities transferred to held to maturity securities Reclassification adjustment for net losses (gains) realized in net income(a) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Reclassification from OCI due to change in accounting principle Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax Reclassification of certain tax effects from OCI Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI Reclass Tax Effect, before Tax, Total Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI Reclass Tax Effect, before Tax, Total Income tax (expense) benefit Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax Other comprehensive income (loss) on investment securities available for sale Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Defined benefit pension and postretirement obligations Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] Amortization of prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Amortization of actuarial loss (gain) Other Comprehensive Income Loss Pension and Other Postretirement Benefit Plans Amortized Gain Loss During Period Before Tax Other Comprehensive Income Loss Pension and Other Postretirement Benefit Plans Amortized Gain Loss During Period Before Tax Reclassification of certain tax effects from OCI Other Comprehensive Income Loss Reclassification Adjustment From AOCI Defined Benefits Tax Effect BeforeTax Other Comprehensive Income Loss Reclassification Adjustment From AOCI Defined Benefits Tax Effect BeforeTax Income tax (expense) benefit Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Other comprehensive income (loss) on pension and postretirement obligations Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent 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 period 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 Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Collectively evaluated Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Acquired and accounted for under ASC 310-30 Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans This element represents the allowance attributable to financing receivables that were acquired and accounted for under ASC 310-30. Total allowance for loan losses Loans: Loans [Abstract] Loans. Individually evaluated Financing Receivable, Individually Evaluated for Impairment Collectively evaluated Financing Receivable, Collectively Evaluated for Impairment Acquired and accounted for under ASC 310-30 Financing Receivable Acquired and Accounted under Modification of Impaired Loans This element represents the financing receivables that were acquired and accounted for under ASC 310-30. Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Nine Months Ending December 31, 2019 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five Beyond 2023 Lessee, Operating Lease, Liability, Payments, Due after Year Six Lessee, Operating Lease, Liability, Payments, Due after Year Six Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less: interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Present value of lease payments Business Combinations [Abstract] Acquisitions Business Combination Disclosure [Text Block] 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 options 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. Income Statement [Abstract] Operating Segments [Member] Risk Management and Shared Serivies [Member] Insurance commissions and fees Wealth management fees(a) Service charges on deposit account fees Card-based fees Other fee-based revenue 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 Provision for credit losses Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Noninterest Income Noninterest Income [Abstract] Service charges and 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 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 Technology Information Technology and Data Processing Occupancy Occupancy, Net Business development and advertising Marketing and Advertising Expense Business development and advertising Equipment Expense Legal and professional Legal And Professional Fees Legal and professional fees. Card issuance costs Card issuance costs Card issuance costs Loan costs Loan Processing Fee Foreclosure / OREO expense, net Foreclosed Real Estate Expense FDIC assessment Federal Deposit Insurance Corporation Premium Expense Other intangible amortization Acquisition related costs(b) Other Other Noninterest Expense Total noninterest expense Income before income taxes Income tax expense 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: 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 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 Amortization of mortgage servicing rights Amortization of Mortgage Servicing Rights (MSRs) 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 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 contribution Payment for Pension Benefits Changes in certain assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] (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) in expense payable Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Increase (decrease) in cash collateral 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 Sales of held to maturity securities Proceeds from Sale of Held-to-maturity 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 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 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 Purchase of preferred shares Payments for Repurchase of Redeemable Preferred 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 and Cash Equivalents, Period Increase (Decrease) Cash, cash equivalents, and restricted cash at beginning of period Cash and Cash Equivalents, at Carrying Value 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 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 Unsettled Trades To Purchase Securities Unsettled Trades To Purchase Securities Unsettled Trades To Purchase Securities 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 Equity issued in (adjustments related to) acquisition Equity issued in (adjustments related to) acquisition Equity issued in (adjustments related to) acquisition Restricted Cash and Cash Equivalents Restricted Cash and Cash Equivalents [Abstract] Restricted Cash Restricted Cash Cash and cash equivalents Cash Equivalents, at Carrying Value 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] Other liabilities Purchased options (time deposit) Purchased Deposit Option [Member] A purchased deposit option with an equity indexed derivative Written options (time deposit) 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 Derivative, Fair Value, Net Derivative, Fair Value, 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] Schedule of assumptions for fair value as of balance sheet date of assets or liabilities that relate to transferor's continuing involvement Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table Text Block] Estimated fair values of financial instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Other 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, number of securities, less than 12 months Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] Held to maturity, number of securities, 12 months or more 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 Available for sale, number of securities, less than 12 months Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year Available for sale, number of securities, 12 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 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 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 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 Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 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 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 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 Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited or expired 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 Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Assumed from Bank Mutual acquisition Shares used in acquisition Shares used in acquisition Exercised, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited or expired, Weighted Average Exercise Price 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) Assumed from Bank Mutual acquisition, Weighted Average Exercise Price Ex Share Price at Acquisition Ex Share Price at Acquisition 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 Huntington National Bank [Domain] Huntington National Bank [Domain] Huntington National Bank [Domain] Estimate Acquired Deposits Estimate Acquired Deposits Estimate Acquired Deposits Estimate Acquired Loans Estimate Acquired Loans Estimate Acquired Loans Estimate Acquired Net Branches Estimate Acquired Net Branches Estimate Acquired Net Branches Components of lease expense Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Operating lease information Lessee, Operating Lease, Information [Table Text Block] Lessee, Operating Lease, Information [Table Text Block] Amortization of operating lease liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Subsegments [Axis] Subsegments [Axis] Subsegments [Domain] Subsegments [Domain] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Domain] Subsegments Consolidation Items [Domain] Selected segment information Schedule of Segment Reporting Information, by Segment [Table Text Block] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] 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] 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 SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Balance at beginning of period 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 Balance at end of period Document And Entity Information [Abstract] Document And Entity Information. Common Stock, Par or Stated Value Per Share 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 Filer Category Entity Filer Category Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 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 Offsetting Assets [Table] Offsetting Assets [Table] Interest Rate Contract Interest Rate Contract [Member] Offsetting Assets [Line Items] Offsetting Assets [Line Items] Offsetting Derivative Assets [Abstract] Offsetting Derivative Assets [Abstract] Gross amounts recognized 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 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 Disaggregation of revenue by Major source Disaggregation of Revenue [Table Text Block] Revenue recognition 606 Revenue Recognition 606 [Text Block] Revenue Recognition 606 [Text Block] FHLB Maturity Schedule Disclosure [Abstract] FHLB Maturity Schedule Disclosure [Abstract] FHLB_Maturity_ [Table] FHLB_Maturity_ [Table] FHLB_Maturity_ [Table] FHLB Maturity within One Year [Domain] FHLB Maturity within One Year [Domain] FHLB Maturity within One Year [Domain] FHLB Maturity One Year to Two Years [Domain] FHLB Maturity One Year to Two Years [Domain] FHLB Maturity One Year to Two Years [Domain] FHLB Maturity Over Two Years to Three Years [Domain] FHLB Maturity Over Two Years to Three Years [Domain] FHLB Maturity Over Two Years to Three Years [Domain] FHLB Maturity Over Three Years [Domain] 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] FHLB Weighted Average Coupon Rate FHLB Weighted Average Coupon Rate FHLB Weighted Average Coupon Rate Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Calculations for basic and diluted earnings per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Amount Recorded at Acquisition [Axis] Amount Recorded at Acquisition [Axis] Amount Recorded at Acquisition [Axis] Amount Recorded at Acquisition Amount Recorded at Acquisition [Domain] [Domain] for Amount Recorded at Acquisition [Axis] Allowance for Unfunded Commitments: SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] Change in the allowance for unfunded commitments 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 Leases Lessee, Leases [Policy Text Block] New Accounting Pronouncements, Policy New Accounting Pronouncements, Policy [Policy Text Block] Finance lease right-of-use asset Finance Lease, Right-of-Use Asset Finance lease liability Finance Lease, Liability 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] Cumulative basis adjustment for fair value hedges 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 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. 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 Effect of dilutive common stock awards Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Effect of dilutive common stock warrants Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Diluted weighted average common shares outstanding Basic earnings per common share Diluted earnings per common share Preferred Equity Preferred Stock [Member] Surplus Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] AOCI Allocated to Parent [Member] AOCI Allocated to Parent [Member] AOCI Allocated to Parent [Member] Treasury Stock Treasury Stock [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance Comprehensive income: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Other Comprehensive Income, Other, Net of Tax Other Comprehensive Income, Other, Net of Tax Other comprehensive income Adoption of new accounting standards New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification Comprehensive income 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 Acquisitions Stock Issued During Period, Value, Acquisitions 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 Common stock ($0.15 per share in 2018 and $0.17 per share in 2019) Dividends, Common Stock, Cash Preferred stock Dividends, Preferred Stock, Cash Purchase of preferred stock Stock Repurchased During Period, Value Issuance of preferred stock Redemption of preferred stock Preferred Stock Redemption Premium Stock-based compensation expense, net Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Tax Act Reclassification Tax Act Reclassification Tax Act Reclassification Change in accounting principle Other Stockholders' Equity, Other Ending balance Increase Adjustment Options, RSA and RSU Increase Adjustment Options, RSA and RSU Increase Adjustment Options, RSA and RSU Decrease Adjustment Options RSA and RSU Decrease Adjustment Options RSA and RSU Decrease Adjustment Options RSA and RSU 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