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Value [Line Items] Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] Award Timing Method Award Timing Method [Text Block] Underlying Hedged Asset, Amortized Cost Basis Underlying Hedged Asset, Amortized Cost Basis Underlying Hedged Asset, Amortized Cost Basis Award Type [Axis] Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Servicing Asset at Fair Value, Other Changes in Fair Value Servicing Asset at Fair Value, Other Changes in Fair Value Lending Related Commitments, Fair Value Commitments, Fair Value Disclosure Trading Symbol Trading Symbol Lessee, Operating Lease, Liability, to be Paid, Year Four Lessee, Operating Lease, Liability, to be Paid, Year Four Ratio of Fair Value to Amortized Cost, AFS Ratio of Fair Value to Amortized Cost, AFS Ratio of Fair Value to Amortized Cost, AFS Interest Income, Securities, Operating, Tax Exempt Interest Income, Securities, 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Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income Tax Expense (Benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit) Allowance for Credit Losses on Loans [Abstract] Allowance for Credit Losses on Loans [Abstract] Allowance for Credit Losses on Loans, includes unfunded commitments Other Assets Other Assets Government National Mortgage Association (GNMA) [Member] Government National Mortgage Association (GNMA) [Member] Board Authorized Purchase Program [Member] Board Authorized Purchase Program [Member] Board Authorized Purchase Program Document Information [Line Items] Document Information [Line Items] Preferred Stock, Shares Issued Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging 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of Reportable Segments Number of Reportable Segments 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 Fair Value of Pledged Securites to Securities Sold under Agreements to Repurchase Fair Value of Pledged Securites to Securities Sold under Agreements to Repurchase Fair Value of Pledged Securites to Securities Sold under Agreements to Repurchase Entity Address, State or Province Entity Address, State or Province Substandard [Member] Substandard [Member] Finance Lease, Principal Payments Finance Lease, Principal Payments Interest and Dividend Income, Operating, Total Interest and Dividend Income, Operating Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Special Mention [Member] Special Mention [Member] Undistributed Earnings (Loss) Available to Common Shareholders, Diluted Undistributed Earnings (Loss) Available to Common Shareholders, Diluted Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Dividends, Common Stock Dividends, Common Stock Servicing Asset Servicing Asset Loans Receivable, Fair Value Disclosure Loans Receivable, Fair Value Disclosure Commercial and Industrial Sector [Member] Commercial and Industrial Sector Commercial and Industrial Sector [Member] Individual: Individual [Axis] Debt Instrument, Maturity Date Month, Year Debt Instrument, Maturity Date Month, Year Debt Instrument, Maturity Date Month, Year (Gain) loss on mortgage banking activities, net (Gain) loss on mortgage banking activities, net (Gain) loss on mortgage banking activities, net Payments of Ordinary Dividends, Common Stock Payments of Ordinary Dividends, Common Stock Entities [Table] Entities [Table] Financing Receivable, Modified, Past Due [Table Text Block] Financing Receivable, Modified, Past 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and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Debt Instrument, Issuance Date Month, Year Debt Instrument, Issuance Date Month, Year Debt Instrument, Issuance Date Month, Year Summary of Derivative Instruments Impact on Results of Operations [Abstract] AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Investments [Domain] Investments [Domain] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Off-Balance Sheet, Credit Loss, Liability [Roll Forward] Off-Balance-Sheet, Credit Loss, Liability [Roll Forward] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Proceeds from Sale and Maturity of Other Investments Proceeds from Sale and Maturity of Other Investments Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Other Liabilities [Member] Other Liabilities [Member] Other Liabilities [Member] Fair Value as of Grant Date Award Grant Date Fair Value Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Derivative Instrument Detail [Abstract] Derivative Instruments Not Designated as Hedging Instruments [Abstract] Derivative Instrument Detail [Abstract] Undistributed Earnings, Basic, Total Undistributed Earnings, Basic Financing Receivable, Modified, Subsequent Default [Line Items] Financing Receivable, Modified, Subsequent Default [Line Items] Payments of Financing Costs Payments of Loan Costs Labor and Related 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National [Member] American National [Member] American National [Member] Liability Class [Axis] Liability Class [Axis] Segments [Domain] Segments [Domain] Effective Date of Acquisition Business Combination, Effective Date of Acquisition Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Allowance Type [Domain] Allowance Type [Domain] Allowance Type Debt Instrument, Redemption Debt Instrument, Redemption Debt Instrument, Redemption Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Credit and 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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. Interest and Fee Income, Loans and Leases Interest and Fee Income, Loans and Leases Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Distributed Earnings Distributed Earnings Assumption for Fair Value of Financing Receivable, Individually Evaluated for Credit Loss, Discount factor Assumption for Fair Value of Financing Receivable, Individually Evaluated for Credit Loss, Discount factor Assumption for Fair Value of Financing Receivable, Individually Evaluated for Credit Loss, Discount factor Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment Business Combination [Axis] Business Combination [Axis] Other Long-Term Debt Other Long-Term Debt Lending Related Commitments Lending Related Commitments Lending related commitments. Other Consumer [Member] Other Consumer [Member] Installment. 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Fair Value Hedge Deferred (Gain) Loss on Discontinuation of Fair Value Hedge Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] Other Short-Term Investments Other Short-Term Investments Financing Receivable, Originated Five or More Years before Latest Fiscal Year Financing Receivable, Originated, More than Five Years before Current Fiscal Year Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-Maturity [Table] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Proceeds from Sale of Held-to-Maturity Securities Proceeds from Sale of Held-to-Maturity Securities Total unrealized losses on held to maturity securities Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Commercial Portfolio Segment [Member] Commercial Portfolio Segment [Member] Financing Receivable, Modified in the Last 12 Months, Performance [Line Items] Financing Receivable, Modified, Past Due [Line Items] Increase (Decrease) in Other Operating Assets and Liabilities, Net Increase (Decrease) in Other Operating Assets and Liabilities, Net Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Risks Inherent in Servicing Assets and Servicing Liabilities, Type [Domain] Risks Inherent in Servicing Assets and Servicing Liabilities, Type [Domain] Assumption for Fair Value of Interest Rate Lock Commitments, Closing Ratio Assumption for Fair Value of Interest Rate Lock Commitments, Closing Ratio Assumption for Fair Value of 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Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Award Timing Disclosures [Line Items] Defined Benefit Plan, Service Cost Defined Benefit Plan, Service Cost Federal Home Loan Bank Advances [Member] Federal Home Loan Bank Advances [Member] Measurement Frequency [Domain] Measurement Frequency [Domain] Loss on prepayments of FHLB advances Loss on prepayments of FHLB advances Loss on prepayments of FHLB advances Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Financing Receivable, Originated Two Years before Latest Fiscal Year Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year Increase (Decrease) in Loans from Federal Home Loan Banks Increase (Decrease) in Loans from Federal Home Loan Banks Debt Instrument, Interest Rate During Period Debt Instrument, Interest Rate During Period Proceeds from Sale, Loan, Mortgage, Held-for-Sale Proceeds from Sale, Loan, Mortgage, Held-for-Sale Net Income (Loss) Attributable to Parent, Total Net Income (Loss) Attributable to Parent Net Income (Loss) Net Income (Loss) Attributable to Parent Gain (Loss) on Sale of Mortgage Loans 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Segment Reporting Information, Profit (Loss) [Abstract] Equity Securities, FV-NI Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI Distributed Earnings To Common Shareholders Diluted Distributed Earnings To Common Shareholders Diluted Distributed earnings to common shareholders diluted. Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Held to Maturity, Securities, Debt Securities Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value Amendment Flag Amendment Flag Schedule of Unrealized Loss on Investments [Table Text Block] Schedule of Unrealized Loss on Investments [Table Text Block] Other Postretirement Benefits Plan [Member] Other Postretirement Benefits Plan [Member] Termination Date Trading Arrangement Termination Date Interest-Bearing Deposits in Banks and Other Financial Institutions Interest-bearing Deposits in Banks and Other Financial Institutions Interest-Bearing Deposits in Banks and Other Financial Institutions Servicing Assets and Servicing Liabilities Risk [Axis] Servicing Assets and Servicing Liabilities Risk [Axis] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Receivable [Domain] Receivable [Domain] Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Loans and Finance Receivables [Member] Loans and Finance Receivables [Member] Share-Based Payment Arrangement, Option, Activity [Table Text Block] Share-Based Payment Arrangement, Option, Activity [Table Text Block] Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Lease, Liability, to be Paid, Due Year One Lease, Liability, to be Paid, Due Year One Lease, Liability, to be Paid, Due 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[Member] Loan Pool CRA Investments Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Foreign Currency Contracts, Liability, Fair Value Disclosure Foreign Currency Contracts, Liability, Fair Value Disclosure Financial Asset, Not Past Due [Member] Financial Asset, Not Past Due [Member] Equity Securities [Member] Equity Securities [Member] Liabilities, Total Liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Increase (Decrease) in Obligation, Pension Benefits Increase (Decrease) in Obligation, Pension Benefits Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements Interest Rate Lock Commitments [Member] Interest Rate Lock Commitments [Member] Interest Rate Lock Commitments [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Payments for (Proceeds from) Loans and Leases Payments for (Proceeds from) Loans and Leases Deposits, Savings Deposits Deposits, Savings Deposits Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis With Unobservable Inputs - Interest Rate Lock Commitements Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis With Unobservable Inputs - Interest Rate Lock Commitements Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis With Unobservable Inputs - Interest Rate Lock Commitements Offsetting Assets [Line Items] Offsetting Assets [Line Items] Derivative Collateral 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or Country Code Non-NEOs Non-NEOs [Member]