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Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Exercise of stock options, net of shares withheld Stock Issued During Period, Value, Stock Options Exercised Underlying Securities Award Underlying Securities Amount Estimated Fair Value Estimate of Fair Value Measurement [Member] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Schedule of Time-Vested Award Activity Nonvested Restricted Stock Shares Activity [Table Text Block] Shares available for issuance (in shares) Shares available for issuance under the ESPP (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Change in the net unrealized gain (loss) on available for sale investment securities, before tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax Amortized Cost Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Provision for credit losses Provision for credit losses Provision for Loan, Lease, and Other Losses Schedule of Amortized Cost and Estimated Fair Value of Securities Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Financial Institution Financial Institution [Member] Financial Institution [Member] Current Fiscal Year Focus Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Provision Net (benefit) provision for loan credit losses Provision (reversal) for loan credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Greater than Five Years Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability, Greater Than Five Years Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability, Greater Than Five Years Derivative [Line Items] Derivative [Line Items] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Common stock dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Due in one year or less Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Stock-based compensation shares issued, net of shares withheld Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Schedule of Securities Classified by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Capital and Regulatory Matters [Line Items] Capital and Regulatory Matters [Line Items] Capital and Regulatory Matters Reclassification adjustment for net gain included in net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Unconditional cancellable commitments Commitments to Extend Credit, Unconditional Cancellable Commitments [Member] Commitments to Extend Credit, Unconditional Cancellable Commitments Investment securities-nontaxable Interest Income, Securities, Operating, Tax Exempt Employee Retention Credit received Employee Retention Credits Employee Retention Credits Equity Components [Axis] Equity Components [Axis] Income taxes paid, total Income Tax Paid, after Refund Received Depreciation and amortization Depreciation and Amortization, Excluding Amortization of Investment Premiums and Discounts and Qualified Affordable Housing Projects Investments Depreciation and Amortization, Excluding Amortization of Investment Premiums and Discounts and Qualified Affordable Housing Projects Investments Entity Interactive Data Current Entity Interactive Data Current Securities Available for Sale Available-for-Sale Securities [Member] To be well capitalized under prompt corrective action provisions, amount Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum Held-to-maturity securities, nonaccrual status Debt Securities, Held-to-Maturity, Nonaccrual Entity Small Business Entity Small Business Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Provision for credit losses Credit Loss, Expense (Reversal) Credit Loss, Expense (Reversal) To be well capitalized under prompt corrective action provisions, ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum Performance period (in years) Share-Based Compensation Arrangement By Share-Based Payment Award, Award Performance Period Share-Based Compensation Arrangement By Share-Based Payment Award, Award Performance Period Net interest income Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Document Type Document Type 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] Paid Short [Member] Allowance for Credit Losses Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Actual, ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Aggregate Intrinsic Value, outstanding and exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Pledged Status [Domain] Pledged Status [Domain] Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Standby letters of credit Financial Standby Letter of Credit [Member] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Construction/land/land development Construction/ Land/ Land Development Construction, Land, and Land Development Loans [Member] Construction, Land, and Land Development Loans [Member] Executive Category: Executive Category [Axis] Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Return of capital and other distributions from cost method investments Proceeds from Cost Method Investment, Distribution, Return of Capital Proceeds from Cost Method Investment, Distribution, Return of Capital Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount PEO Name PEO Name Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Unrealized Gain on Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] 12 Months or More Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Vesting percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Appreciation Requirement, Percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Appreciation Requirement, Percentage Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Cash and due from banks Cash and Due from Banks Schedule of Loan Portfolio Aging Analysis Financing Receivable, Past Due [Table Text Block] Current Loans Current Financial Asset, Not Past Due [Member] Related tax benefits recognized in net income Share-Based Payment Arrangement, Expense, Tax Benefit Fair Value Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value [Abstract] Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Debt securities Debt Securities Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Increase in the cash surrender value of life insurance Bank Owned Life Insurance Income Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Debt Instrument [Axis] Debt Instrument [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] Interest expense Interest Expense, Operating and Nonoperating [Abstract] Salaries and employee benefits Labor and Related Expense Received Long [Member] Employee Stock ESPP Employee Stock [Member] Schedule of Fair Values of Derivative Instruments on the Balance Sheet Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Insider Trading Arrangements [Line Items] Default Amount Financing Receivable Excluding Accrued Interest Modified, Default Amount Financing Receivable Excluding Accrued Interest Modified, Default Amount Change in the net unrealized gain (loss) on investment securities, net of tax Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent 3.85% FHLB Advance 3.85% FHLB Advance [Member] 3.85% FHLB Advance Cash surrender value of bank-owned life insurance Bank Owned Life Insurance Average closing price period (in days) Share-Based Compensation Arrangement By Share-Based Payment Award, Average Closing Price Period Share-Based Compensation Arrangement By Share-Based Payment Award, Average Closing Price Period Repayments of long-term FHLB advances Payments Of FHLBank Borrowings, Long-Term Advances, Financing Activities Payments Of FHLBank Borrowings, Long-Term Advances, Financing Activities Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Fair Value Measurement [Domain] Fair Value Measurement [Domain] Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] FHLB advances, repurchase agreements and other borrowings Federal Home Loan Bank Advances and Securities Sold Under Agreements to Repurchase, Fair Value Federal Home Loan Bank Advances and Securities Sold Under Agreements to Repurchase, Fair Value Year two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Cash flow hedges: Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Impairment of right-of-use assets due to branch closures Noncash or Part Noncash, Impairment Of Right Of Use Assets Due To Branch Closures Noncash or Part Noncash, Impairment Of Right Of Use Assets Due To Branch Closures Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Increase (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities Pass Pass [Member] Plan Name [Axis] Plan Name [Axis] Securities carried at fair value through income: Debt Securities, FV-NI [Abstract] Debt Securities, FV-NI [Abstract] Schedule of Loans Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Reserve release Loss Contingency Accrual, Loss (Reversal of Loss) Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Items Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Target percentage Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage Weighted-Average Interest Rate Derivative, Weighted-Average Interest Rate Derivative, Weighted-Average Interest Rate Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Other fee income Fees and Commissions, Other1 Fees and Commissions, Other1 Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Commercial mortgage-backed securities Commercial mortgage-backed securities Commercial mortgage-backed securities Commercial Mortgage-Backed Securities [Member] Hedging Designation [Domain] Hedging Designation [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Recovery for credit losses for held to maturity securities Net (benefit) provision for held to maturity securities Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal) Mortgage banking revenue Mortgage Banking Revenue Noninterest income derived from the sale and changes in fair value of residential mortgage loans held for sale and fees for servicing of residential mortgage loans held by third parties. Also includes changes in the fair value of residential mortgage loan commitments and forward sales commitments considered to be derivative instruments. Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Recognition of operating right-of-use assets Recognition Of Operating Lease Right Of Use Asset Recognition Of Operating Lease Right Of Use Asset Schedule of Allowance for Credit Losses for Held-to-Maturity Debt Securities Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table Text Block] Number of consecutive days Share-Based Compensation Arrangement by Share-Based Payment Award, Number Of Consecutive Trading Days Share-Based Compensation Arrangement by Share-Based Payment Award, Number Of Consecutive Trading Days Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net loss realized as a yield adjustment in interest on transferred investment securities Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Realized Gain (Loss) On Available-For-Sale Securities Transferred To Held-To-Maturity Before Tax Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Realized Gain (Loss) On Available-For-Sale Securities Transferred To Held-To-Maturity Before Tax Entity Filer Category Entity Filer Category Total Debt Securities, Available-for-Sale, Unrealized Loss Position Transfers of other real estate owned to other assets Payments For Transfers Of Other Real Estate Owned To Other Assets Payments For Transfers Of Other Real Estate Owned To Other Assets Capital and Regulatory Matters [Table] Capital and Regulatory Matters [Table] Capital and Regulatory Matters Due in one year or less Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Omnibus Plan Omnibus Plan [Member] Omnibus Plan Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] Derivatives not designated as hedging instruments: Non-Hedging Not Designated as Hedging Instrument [Member] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Rabbi Trust assets Rabbi Trust Assets [Member] Rabbi Trust Assets Schedule of Proceeds from Sales of Securities Available for Sale and Gross Gains and Losses Gain (Loss) on Securities [Table Text Block] Allowance for Loan and Lease Losses [Roll Forward] Allowance for Loan and Lease Losses [Roll Forward] Insurance recoveries Insurance Recoveries Caps and floors Interest Rate Cap [Member] Single-family residential real estate Single Family [Member] Other liabilities - derivatives Derivative Liability Entity Address, Address Line One Entity Address, Address Line One Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Purchase of low-income housing tax credit investments Payment to Acquire Low Income Housing, Tax Credit Investments Payment to Acquire Low Income Housing, Tax Credit Investments Income tax expense Income Tax Expense (Benefit) Office and operations Office and Operations Expense Office and Operations Expense Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Total Charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Contingency reserve Loss Contingency, Accrual, Current Net charge-offs (recoveries) to loan average balance (annualized) Financing Receivable, Writeoff after Recovery to Average Outstanding, Percent AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Statement [Table] Statement [Table] To be well capitalized under prompt corrective action provisions, ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Cash received from exercise of stock options Proceeds from Stock Options Exercised Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Remaining Maturity (in years) Derivative, Contract Term Year two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Schedule of Non-performing (Nonaccrual) Loans Held for Investment Financing Receivable, Nonaccrual [Table Text Block] Interest rate, floor Debt Instrument, Interest Rate, Floor Debt Instrument, Interest Rate, Floor Interest income Loans And Leases Receivable, Impaired, Interest On Nonaccrual Loans Loans And Leases Receivable, Impaired, Interest On Nonaccrual Loans Loans held for sale Loan, Held-for-Sale, Fair Value Disclosure Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Rolling Maturity [Abstract] Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]