Cover [Abstract] Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Three Amendment Flag City Area Code Entity Address, City or Town Entity Address, Country Current Fiscal Year End Date Document Period End Date Entity Incorporation, State or Country Code Entity Information, Former Legal or Registered Name Local Phone Number Entity Address, Postal Zip Code Entity Address, State or Province Title of 12(b) Security No Trading Symbol Flag Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Filer Category Entity Registrant Name Entity Central Index Key Entity Tax Identification Number Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Document Quarterly Report Document Transition Report Entity Interactive Data Current Entity File Number Entity Shell Company Entity Emerging Growth Company Entity Small Business Changes in AOCL [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Award Type [Axis] Number of securities with market fair value less than amortized cost ASU 2016-13 [Member] ASU 2016-02 [Member] Accounting Standards Update 2016-02 [Member] Unrealized Gains (Losses) on Securities Available For Sale [Member] Unrealized Gains (Losses) on Cash Flow Hedges [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated other comprehensive loss Accumulated other comprehensive (income) loss for regulatory purposes Accumulated Other Comprehensive Loss ("AOCL") [Abstract] Accumulated Other Comprehensive Loss [Member] Accumulated Other Comprehensive Loss [Member] Residential Adjustable Rate Mortgage Loans [Member] Total Adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Adjustments to Reconcile Net Income to Net Cash From Operating Activities Share based compensation withholding obligation Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Adjustments for New Accounting Pronouncements [Axis] Advertising Total compensation expense recognized Increase in allowance for loan losses Allowance for Loan and Lease Losses, Period Increase (Decrease) Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Antidilutive shares excluded from computation of diluted loss per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Other Asset Backed [Member] Asset-backed Securities [Member] Impairment charges recognized [Abstract] Other real estate, additional charge Asset Impairment Charges Assets [Abstract] Assets, Fair Value Disclosure [Abstract] Assets Assets [Abstract] Assets [Abstract] Total Assets Assets Supplemental balance sheet information related to operating leases [Abstract] Unrealized Gains Amortized cost Debt Securities, Available-for-sale, Amortized Cost Available-for-sale Securities, Amortized Cost Basis [Abstract] Unrealized Losses Securities available for sale Securities available for sale Amortized cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Total available-for-sale securities fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Maturing within one year Maturing after ten years Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Maturing within one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Maturing after ten years Maturing after five years but within ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost U.S. agency residential mortgage-backed Maturing after one year but within five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Maturing after five years but within ten years Maturing after one year but within five years Gain and losses realized on sale of securities available for sale [Abstract] U.S. agency residential mortgage-backed Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Total Fair Value Debt Securities, Available-for-sale Balance Sheet Location [Domain] Balance Sheet Location [Axis] Bank-owned life insurance Bank owned life insurance Regulatory Matters [Abstract] Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Cash and cash equivalents Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Equity issued under merger agreement (in shares) Business Acquisition [Line Items] Business Acquisition [Axis] Recent Acquisition [Abstract] Business Acquisition, Acquiree [Domain] Property and equipment, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Recent Acquisition [Abstract] Business Combination, Description [Abstract] Recent Acquisition Business Combination Disclosure [Text Block] Valuation of the assets acquired and liabilities assumed [Abstract] Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Merger related expenses Purchase price (fair value of consideration) Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Total risk-based capital Capital Total capital to risk-weighted assets [Abstract] Actual, Ratio Capital to Risk Weighted Assets Minimum for Well Capitalized Institutions, Amount Minimum for Well-Capitalized Institutions, Ratio Capital Required to be Well Capitalized to Risk Weighted Assets Minimum for Adequately Capitalized Institutions, Ratio Capital Required for Capital Adequacy to Risk Weighted Assets Minimum for Adequately Capitalized Institutions, Amount Recorded Book Balance [Member] Reported Value Measurement [Member] Net Increase (Decrease) in Cash and Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents at End of Period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Acquisition of TCSB Bancorp Inc., less cash received Information Regarding Options Exercised Cash and Cash Equivalents Cash and Cash Equivalents, at Carrying Value Cash and due from banks Unrealized gain on cash flow hedges, net of tax Cash Flow Hedge Designation [Member] Purchase Credit Impaired (PCI) Loans Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block] Reclassification from (to) nonaccretable difference Disposals/other adjustments New loans purchased Balance at end of period Balance at beginning of period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Accretion recorded as loan interest income Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Accretable yield of PCI loans, or income expected to be collected [Roll Forward] Carrying amount, net of allowance for loan losses Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net Allowance for loan losses Loans acquired with deteriorated credit quality Total carrying amount Class of Stock [Line Items] U.S. Agency Commercial Mortgage-Backed [Member] Commercial [Member] Commercial [Member] Commitments and contingent liabilities Contingencies [Abstract] Contingencies Commitments and Contingencies Disclosure [Text Block] Common Stock [Member] VISA Class B Common Stock [Member] Common equity tier 1 capital Actual, Amount Common Equity Tier One Capital Cash dividends declared (in dollars per share) Minimum for Adequately Capitalized Institutions, Amount Common Equity Tier One Capital Required for Capital Adequacy Minimum for Well-Capitalized Institutions, Amount Common Equity Tier One Capital Required to be Well-Capitalized Common equity tier 1 capital to risk-weighted assets [Abstract] Common Equity Tier One Capital [Abstract] Common stock, par value (in dollars per share) Common stock, shares issued (in shares) Common stock, shares authorized (in shares) Common stock, shares outstanding (in shares) Common stock, no par value, 500,000,000 shares authorized; issued and outstanding: 22,498,776 shares at June 30, 2019 and 23,579,725 shares at December 31, 2018 Common Stock, Value, Issued Communications Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Accumulated Other Comprehensive Loss ("AOCL") Comprehensive Income (Loss) Note [Text Block] Consolidated [Member] Consolidated Entities [Member] Retail [Member] Consumer Portfolio Segment [Member] Contract liabilities Contract assets Core Deposits [Member] Corporate [Member] Credit Loss Status [Axis] Credit Loss Status [Domain] Disaggregation of Revenue Sources by Attribute Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue Sources by Attributes [Abstract] Designated as Hedging Instrument [Member] Realized losses Twelve Months or More, Fair Value Total, Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Total, Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position Less Than Twelve Months, Fair Value Net gains (losses) on securities Realized gains Twelve Months or More, Unrealized Losses Less Than Twelve Months, Unrealized Losses Deferred tax assets, net Total Deposits Deposits Savings and interest-bearing checking Deposits Deposits [Abstract] Net depreciation, amortization of intangible assets and premiums and accretion of discounts on securities, loans and interest bearing deposits - time Depreciation, Amortization and Accretion, Net Average Maturity Derivative financial instrument according to type of hedge [Abstract] Derivative financial instruments Derivatives Derivative Financial Instruments [Abstract] Derivative Instrument [Axis] Notional Amount Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative financial instruments Derivatives Derivative Liability Fair value of derivative instruments, balance sheet location [Abstract] Fair Value Derivative, Fair Value, Net Asset Derivatives Derivative Asset, Fair Value, Gross Asset Gain (Loss) Recognized in Income Liability Derivatives Hedging Relationship [Axis] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Line Items] Gain Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) Derivative Contract [Domain] Derivatives, Fair Value [Line Items] Carrying amount of loans that meet the criteria of ASC 310-30 treatment [Abstract] Share Based Compensation [Abstract] Share Based Compensation Share-based Payment Arrangement [Text Block] Cash dividends declared Dividends, Common Stock, Cash Earnings Per Share Reconciliation [Abstract] Diluted (in dollars per share) Earnings Per Share, Diluted Basic (in dollars per share) Basic (in dollars per share) Net Income Per Common Share Earnings Per Share [Abstract] Decrease in income tax expense Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount Tax benefit relating to compensation expense recognized Share-based Payment Arrangement, Expense, Tax Benefit Tax benefit realized Total compensation cost not yet recognized Total compensation cost not yet recognized, period for recognition Stock Options [Member] Furniture, fixtures and equipment Equipment Expense Equity securities at fair value Equity Securities, FV-NI Equity Component [Domain] Equity Securities at fair value, net gains (losses) Equity Securities, FV-NI, Unrealized Gain (Loss) Fair Value [Member] Estimate of Fair Value Measurement [Member] Estimated fair value of intangible assets Included in other comprehensive income (loss) Asset Fair Value [Abstract] Fair Value, Net Asset (Liability) [Abstract] Included in results of operations Amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at June 30 Quantitative information about Level 3 fair value measurements measured on a non recurring basis [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Abstract] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Recurring Basis [Member] Fair Value, Recurring [Member] Assets and Liabilities Measured at Fair Value Fair Value, Measurement Frequency [Domain] Fair Value by Liability Class [Domain] Nonrecurring Basis [Member] Fair Value, Nonrecurring [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Quantitative Information About Level 3 Fair Value Measurements Measured on a Recurring Basis and Non-recurring Basis Fair Value Hierarchy and NAV [Domain] Fair Value, Hierarchy and NAV [Axis] Fair Value Measurement Inputs and Valuation Techniques [Table] Changes in fair value for financial assets [Abstract] Assets and liabilities measured at fair value [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Measurement Frequency [Axis] Liability Class [Axis] Measurement Basis [Axis] Fair Value Disclosures Fair Value Disclosures [Text Block] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, by Balance Sheet Grouping [Table] Estimated Recorded Book Balances and Fair Values Fair Value, by Balance Sheet Grouping [Table Text Block] Reconciliation for all Assets and (Liabilities) Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value Measurement [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Significant Unobservable Inputs (Level 3) [Member] Significant Un-observable Inputs (Level 3) [Member] Fair Value, Inputs, Level 3 [Member] Significant Other Observable Inputs (Level 2) [Member] Significant Other Observable Inputs (Level 2) [Member] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Reconciliation for all assets and (liabilities) measured at fair value on a recurring basis using significant unobservable inputs (Level 3) [Roll Forward] Purchases, issuances, settlements, maturities and calls Transfers in and/or out of Level 3 Ending balance Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Difference Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Changes in Fair Value for Financial Assets Fair Value Hedge Designation [Member] Fair Value, Option, Quantitative Disclosures [Table] Federal Home Loan Bank and Federal Reserve Bank stock, at cost Federal Home Loan Bank and Federal Reserve Bank Stock Federal Home Loan Bank Stock and Federal Reserve Bank Stock FDIC deposit insurance Loans Acquired with Deteriorated Credit Quality [Member] Financial Asset Acquired with Credit Deterioration [Member] Financial Instrument [Axis] Fair Values of Financial Instruments [Abstract] Liabilities [Abstract] Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Assets [Abstract] Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Fair Values of Financial Instruments Financial Instruments Disclosure [Text Block] Loans Past Due, 60-89 days [Member] Total Financing Receivable, Past Due Analysis of allowance for loan losses by portfolio segment [Roll Forward] Number of contracts Financing Receivable, Modifications, Number of Contracts Financing Receivable, Recorded Investment [Line Items] Loans charged against the allowance Financing Receivable, Allowance for Credit Loss, Writeoff Financing Receivable Portfolio Segment [Axis] Loan Ratings by Loan Class Financing Receivable Credit Quality Indicators [Table Text Block] Financing Receivable, Modifications [Line Items] Class of Financing Receivable, Type [Domain] Financing Receivables, Period Past Due [Domain] Financing Receivable, Recorded Investment, Past Due [Line Items] Loans Past Due, 90+ days [Member] Post-modification recorded balance Financing Receivable, Troubled Debt Restructuring, Postmodification Non-Accrual Class of Financing Receivable, Type [Axis] Loans not Past Due Financing Receivable, Not Past Due Collectively evaluated for impairment Financing Receivables, Period Past Due [Axis] Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Individually evaluated for impairment Recoveries credited to the allowance 90+ and Still Accruing Loans Past Due, 30-59 days [Member] Loans Not Past Due [Member] Financing Receivable, Impaired [Line Items] Pre-modification recorded balance Financing Receivable, Troubled Debt Restructuring, Premodification Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Charge offs due to troubled debt restructurings Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down Allowance for loan losses and recorded investment in loans by portfolio segment [Abstract] Financing Receivable, Allowance for Credit Losses [Line Items] Balance at end of period Balance at beginning of period Financing Receivable, Allowance for Credit Loss Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Gross Carrying Amount Total Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Major Class Name [Domain] Six months ending December 31, 2019 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2024 and thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Accumulated Amortization Finite-Lived Intangible Assets by Major Class [Axis] Summary of estimated core deposit intangible amortization [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Estimated useful life 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Four Residential Fixed Rate Mortgage Loans [Member] Fixed Income Interest Rate [Member] Other real estate and repossessed assets, net Foreign Government [Member] Net gains on mortgage loans Mortgage loans Net gains on mortgage loans Gain (Loss) on Sales of Loans, Net Net gains (losses) on assets Decrease in goodwill Goodwill and other Intangibles Goodwill and Intangible Assets Disclosure [Text Block] Unamortized intangible assets - goodwill [Abstract] Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Goodwill Gross Carrying Amount Goodwill and Other Intangibles [Abstract] Hedging Designation [Axis] Hedging Relationship [Domain] Hedging Designation [Domain] Average Recorded Investment Interest Income Recognized, with an allowance for loan losses recorded Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Impaired Loans Impaired Loans by class [Abstract] Impaired Financing Receivable, Recorded Investment [Abstract] Interest Income Recognized, with no related allowance for loan losses recorded Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method Average Recorded Investment, with no related allowance for loan losses recorded Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Average Recorded Investment, with an allowance for loan losses recorded Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, Interest Income, Accrual Method Recorded Investment, with an allowance for loan losses recorded Impaired Financing Receivable, with Related Allowance, Recorded Investment Unpaid Principal Balance, with no related allowance for loan losses recorded Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Unpaid Principal Balance, with an allowance for loan losses recorded Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Recorded Investment, with no related allowance for loan losses recorded Impaired Financing Receivable, with No Related Allowance, Recorded Investment Recorded Investment Related Allowance Impaired Financing Receivable, Related Allowance Unpaid Principal Balance Income Tax [Abstract] Income Statement Location [Axis] Income Statement Location [Domain] Condensed Consolidated Statements of Operations (unaudited) [Abstract] Income Tax Income Tax Disclosure [Text Block] Income Before Income Tax Total reclassifications before tax Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income tax expense Income taxes Increase in accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Deferred income tax expense Increase (Decrease) in Deferred Income Taxes Net increase in total deposits Increase in accrued income and other assets Increase (Decrease) in Other Operating Assets Loans held for sale [Abstract] Increase (Decrease) in Loans Held-for-sale [Abstract] Deferred loan fees and costs Increase (Decrease) in Loans, Deferred Income Increase (Decrease) in Stockholders' Equity [Roll Forward] Effect of stock options (in shares) Other intangibles Amortized intangible assets - core deposits [Abstract] Goodwill and other intangibles Intangible Assets, Net (Including Goodwill) Interest and fees on loans Interest on securities Accrued interest payable Interest Income Total Interest Income Interest and Dividend Income, Operating Interest Expense Interest Expense [Abstract] Total Interest Expense Interest expense Interest Expense Other borrowings and subordinated debentures Interest Expense, Borrowings Deposits Interest Expense, Deposits Net Interest Income Interest Income (Expense), Net Taxable Tax-exempt Net Interest Income After Provision for Loan Losses Interest Income (Expense), after Provision for Loan Loss Interest Income [Member] Interest Interest bearing deposits Interest-bearing Deposits in Banks and Other Financial Institutions Interest-Rate Cap Agreements [Member] Accrued interest included in recorded investment Accrued interest included in total Interest Receivable Rate-Lock Mortgage Loan Commitments [Member] Interest Rate Swap [Member] Interest Rate Swap [Member] Brokered time Interest Expense [Member] Accrued interest receivable Time Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Investments [Domain] Investment Owned [Abstract] Number of shares owned (in shares) Investment Owned, Balance, Shares Investment Holdings [Table] Investment Type [Axis] Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Securities [Abstract] Amortized Cost and Fair Value of Securities Available for Sale by Contractual Maturity Subordinated debentures Subordinated debentures 2024 and thereafter 2022 2023 Total lease payments Lessee, Operating Lease, Liability, Payments, Due Maturity Analysis of Lease Liabilities Six months ending December 31, 2019 Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount 2021 2020 Compensation and employee benefits Components of operating leases [Abstract] Total Lease, Cost Components of Operating Leases Leases Leases of Lessee Disclosure [Text Block] Leases [Abstract] Liabilities [Abstract] Liabilities, Fair Value Disclosure [Abstract] Liabilities and Shareholders' Equity Total Liabilities Liabilities Total Liabilities and Shareholders' Equity Liabilities and Equity Total ending allowance for loan losses balance Allowance for loan losses Loans and Leases Receivable, Allowance Total loans Loans Loans Loans held for sale, carried at fair value Aggregate Fair Value Loans Held-for-sale, Fair Value Disclosure Loans [Abstract] Loans and Leases Receivable, Other Information [Abstract] Net Loans Loans and Leases Receivable, Net Amount Total loans recorded investment Commercial Loans and Leases Receivable, Net of Deferred Income Loans receivable Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Contractual Principal Loans Receivable Held-for-sale, Amount Net (gains) losses on securities Securities Marketable Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss Measurement Input Type [Domain] Adjustment for Differences Between Comparable Sales [Member] Discount Rate [Member] Measurement Input Type [Axis] Retail mortgage loans in process of foreclosure Private Label Mortgage-Backed [Member] Private Label Mortgage-Backed [Member] U.S. Agency Residential Mortgage-Backed [Member] Non-performing TDRs [Member] Net Cash From Operating Activities Net Cash Provided by (Used in) Operating Activities Net Cash Used in Investing Activities Net Cash Provided by (Used in) Investing Activities Cash Flow Used in Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Net Cash From Financing Activities Net Cash Provided by (Used in) Financing Activities Net income Net Income Net Income Reclassifications, net of tax Cash Flow From Financing Activities Net income per common share [Abstract] Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Standards [Abstract] Expected increase in the allowance for loan losses New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Standards New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Non-interest bearing Total Non-interest Income Noninterest Income Non-interest Expense Total Other Noninterest Income, Other Operating Income Total Non-interest Expense Noninterest Expense Non-interest Income Noninterest Income [Abstract] No Hedge Designation [Member] Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Occupancy, net Maturities of lease liabilities [Abstract] Weighted average remaining lease term (years) Lease right of use asset Right of use asset Operating lease cost Weighted average discount rate Operating leases Operating Lease, Payments Total Lease liabilities Lease liability Preparation of Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Preparation of Financial Statements [Abstract] Reclassification adjustments for (gains) losses included in earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Reclassification adjustment for income recognized in earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Unrealized gains (losses) recognized in other comprehensive income (loss) on derivative instruments Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax Income tax expense (benefit) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Income tax expense (benefit) Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax Unrealized gains (losses) recognized in other comprehensive income (loss) on securities available for sale Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax Unrealized gains (losses) recognized in other comprehensive income (loss) on securities available for sale, net of tax Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Net impairment loss recognized in earnings Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities Additions to credit losses on securities for which no previous OTTI was recognized Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Increases to credit losses on securities for which OTTI was previously recognized Balance at beginning of period Balance at end of period Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Other borrowings Other borrowings Other Borrowings Accrued income and other assets Securities available for sale Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] Derivative instruments Unrealized gains (losses) recognized in other comprehensive income (loss) on derivative instruments, net of tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Effective Portion) Unrealized gain (loss) arising during period Unrealized gains (losses) arising during period Other investments Other Interest and Dividend Income Accrued expenses and other liabilities Other Other Real Estate and Foreclosed Assets [Abstract] Other Assets [Member] Other Liabilities [Member] Other comprehensive income (loss) Other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Performing TDRs [Member] Performing Financial Instruments [Member] Aging Analysis of Loans by Class Financing Receivable, Past Due [Table Text Block] Share based compensation withholding obligation Payment, Tax Withholding, Share-based Payment Arrangement Disbursements for loans held for sale Payments for Origination of Mortgage Loans Held-for-sale Repurchase of common stock Payments for Repurchase of Common Stock Purchases of securities available for sale Payments to Acquire Available-for-sale Securities Dividends paid Payments of Dividends Capital expenditures Payments to Acquire Property, Plant, and Equipment Performance Stock Units [Member] Plan Name [Axis] Plan Name [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Preferred stock, par value (in dollars per share) Preferred Stock, No Par Value Securities [Member] Preferred Stock [Member] Preferred stock, shares issued (in shares) Preferred stock, no par value, 200,000 shares authorized; none issued or outstanding Preferred Stock, Value, Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Proceeds from the maturity of interest bearing deposits - time Proceeds from (Payments for) in Interest-bearing Deposits in Banks Net increase (decrease) in other borrowings Proceeds from Federal Home Loan Bank Advances Proceeds from FHLBank Borrowings, Financing Activities Proceeds from issuance of common stock Proceeds from maturities, prepayments and calls of securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Proceeds from bank-owned life insurance Proceeds from the sale of securities available for sale Proceeds from sales of loans held for sale Proceeds from Sale of Loans Held-for-sale Proceeds from the sale of other real estate and repossessed assets Sale of Mortgage Loans [Abstract] Proceeds from the sale of portfolio loans Proceeds from sale of mortgage loan Proceeds from Sale of Loans Held-for-investment Proceeds Cash proceeds received Legal and professional Property and equipment, net Provision for loan losses Provision for loan losses Additional provision for loan losses on impaired loans Right of use assets obtained in exchange for lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Foreclosed residential real estate properties Other real estate, valuation allowance Real Estate Owned, Valuation Allowance Credit Losses Recognized in Earnings on Securities Available for Sale Loans [Abstract] Reclassifications Out of Each Component of AOCL Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Domain] Amounts reclassified from AOCL Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Member] Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Payments of Federal Home Loan Bank Advances Payments of FHLBank Borrowings, Financing Activities Mortgage [Member] Residential Portfolio Segment [Member] Restricted Stock [Member] Accumulated Deficit [Member] Accumulated deficit Revenue from Contracts with Customers [Abstract] Revenue from Contracts with Customers Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Exercisable, weighted average remaining contractual term Vested and expected to vest, weighted-average remaining contractual term Exercisable, aggregate intrinsic value Outstanding, weighted average remaining contractual term Estimated Core Deposit Intangible Amortization As Adjusted [Member] Gains and Losses Realized on Sale of Securities Available for Sale Schedule of Realized Gain (Loss) [Table Text Block] Outstanding Stock Option Grants and Transactions Final Valuation of Assets Acquired and Liabilities Assumed Investments in a Continuous Unrealized Loss Position Schedule of Impaired Financing Receivable [Table] Non-Vested Restricted Stock, Restricted Stock Units and PSU's Securities Available for Sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Loans on Non-Accrual Status and Past Due More than 90 Days Analysis of Allowance for Loan Losses by Portfolio Segment Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Other Intangible Assets, Net of Amortization Reconciliation of Basic and Diluted Net Income Per Share Accumulated Other Comprehensive Loss (AOCL), Net of Tax Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Actual Capital Amounts and Ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Debt Securities, Available-for-sale [Line Items] Schedule of Available-for-sale Securities [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Effect of Derivative Financial Instruments on Condensed Consolidated Statement of Operations Schedule of Stock by Class [Table] Fair Value of Derivative Instruments Servicing asset measurement input Servicing Asset, Measurement Input Servicing asset fair value Servicing Asset Capitalized mortgage loan servicing rights, carried at fair value Servicing Asset at Fair Value, Amount Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Average Exercise Price [Roll Forward] Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Expired (in dollars per share) Share Based Compensation [Abstract] Share-based Payment Arrangement, Noncash Expense [Abstract] Weighted Average Grant Date Fair Value [Roll Forward] Share based compensation Share-based Payment Arrangement, Noncash Expense Closing price (in dollars per share) Share Price Granted (in shares) Options issued under merger agreement (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Vesting period Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of additional shares approved for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Forfeited (in dollars per share) Information regarding options exercised [Abstract] Granted (in shares) Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 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, ending balance (in shares) Outstanding, beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Outstanding, beginning balance (in dollars per share) Outstanding, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (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 Intrinsic value Exercisable, period end (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Exercisable, period end (in shares) Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Number of Shares [Roll Forward] Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Weighted-Average Remaining Contractual Term (Years) [Abstract] Vested and expected to vest, aggregate intrinsic value Equity Award [Domain] Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding, beginning balance (in dollars per share) Outstanding, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding, aggregate intrinsic value Vested and expected to vest, period end (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Vested and expected to vest, period end (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Share based compensation withholding obligation, common stock (in shares) Short-term lease cost Condensed Consolidated Statements of Financial Condition (unaudited) [Abstract] Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract] Equity Components [Axis] Statement [Line Items] Statement [Table] Condensed Consolidated Statements of Cash Flows (unaudited) [Abstract] Condensed Consolidated Statements of Shareholders' Equity (unaudited) [Abstract] Number of shares authorized for repurchase (in shares) Stock Repurchase Program, Number of Shares Authorized to be Repurchased Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share based compensation, common stock (in shares) Issuance of shares of common stock (in shares) Acquisition of TCSB Bancorp, Inc. Issuance of common stock Stock Issued During Period, Value, New Issues Share based compensation Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Stock repurchased (in shares) Repurchase of shares of common stock (in shares) Stock repurchased Repurchase of common stock Shareholders' Equity and Earnings Per Common Share Stockholders' Equity Note Disclosure [Text Block] Total Shareholders' Equity Balance at beginning of period Balances at end of period Total shareholders' equity Shareholders' Equity Shareholders' Equity and Earnings Per Common Share [Abstract] Subsequent Event [Member] Subsequent Event Type [Domain] Subsequent Event Type [Axis] Summary of Investment Holdings [Line Items] Minimum for Well-Capitalized Institutions, Amount Actual, Ratio Minimum for Adequately Capitalized Institutions, Ratio Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 capital to risk-weighted assets [Abstract] Tier One Risk Based Capital [Abstract] Minimum for Adequately Capitalized Institutions, Ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets Minimum for Well-Capitalized Institutions, Ratio Tier One Leverage Capital Required to be Well Capitalized to Average Assets Minimum for Adequately Capitalized Institutions, Amount Tier One Leverage Capital Required for Capital Adequacy Tier 1 capital Tier One Leverage Capital Actual, Ratio Tier One Leverage Capital to Average Assets Minimum for Adequately Capitalized Institutions, Amount Tier One Risk Based Capital Required for Capital Adequacy Actual, Amount Tier One Risk Based Capital Minimum for Well Capitalized Institutions, Ratio Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Tier 1 capital to average assets [Abstract] Minimum for Well-Capitalized Institutions, Amount Tier One Risk Based Capital Required to be Well Capitalized Deposits with stated maturity Trading securities, realized gain (loss) Trading Securities, Realized Gain (Loss) Trading Activity [Axis] Trading Activity, by Type [Domain] Transfer of loans to held for sale Transfer of Portfolio Loans and Leases to Held-for-sale Transfers to other real estate and repossessed assets Financial Instruments [Domain] Troubled Debt Restructurings Trust Preferred [Member] Type of Adoption [Domain] Subjective Allocation [Member] Unallocated Financing Receivables [Member] Gross unrecognized tax benefits U.S. Agency [Member] Obligations of States and Political Subdivisions [Member] U.S. Treasury [Member] Valuation Technique [Axis] Valuation Technique [Domain] Variable lease cost Variable Income Interest Rate [Member] Weighted average shares outstanding for calculation of diluted earnings per share (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Counterparty Name [Axis] Consolidated Entities [Domain] Consolidated Entities [Axis] Directors [Member] Executive Officers [Member] Executive Officer [Member] Customer [Axis] Maximum [Member] Minimum [Member] Mortgage Loans on Real Estate, Loan Type [Domain] Mortgage Loans on Real Estate, Loan Type [Axis] Customer [Domain] Products and Services [Domain] Products and Services [Axis] Range [Domain] Statistical Measurement [Domain] Range [Axis] Statistical Measurement [Axis] Counterparty Name [Domain] Scenario, Unspecified [Domain] Scenario [Axis] Relationship to Entity [Domain] Title of Individual [Axis] Weighted Average [Member] Amount of gain (loss) realized from securities related to preferred stock classified as trading. Trading Securities Realized Gain Loss, Preferred Stock Gains (losses) related to preferred stock held for sale Total recorded investments by credit score. Credit score by investment Total Represents the FICO score of loans by category. Eight hundreds and above 800 and above Represents the FICO score of loans by category. Credit score Under 500 Under 500 Refers to Mortgage loans serviced for Freddie Mac. Freddie Mac [Member] Represents the FICO score of loans by category. Credit score 650 to 699 650-699 Represents the FICO score of loans by category. Credit score 600 to 649 600-649 Represents the FICO score of loans by category. Credit score 700 to 749 700-749 Represents the FICO score of loans by category. Credit score 750 to 799 750-799 Represents loans categorized as unknown when the FICO credit score is not known. Credit Score Unknown Unknown Represents the FICO score of loans by category. Credit score 550 to 599 550-599 Represents the FICO score of loans by category. Credit score 500 to 549 500-549 Loan ratings/credit scores by loan class [Abstract] Loan ratings/credit scores by loan class [Abstract] Loan to purchase or refinance residential real estate (for example, but not limited to, a home) in which the interest rate is and the amount of each payment remain constant throughout the life of the loan and loans in which the interest rate is periodically adjusted according to changes in a specified reference rate. Fixed Rate Residential Mortgage and Adjustable Rate Residential Mortgage [Member] Fixed Rate Residential Mortgage and Adjustable Rate Residential Mortgage [Member] Carrying amount of other real estate that are impaired, net reserves. Other Real Estate Impaired, Net Reserves Other real estate, carrying amount Amount of unrealized gain (loss) on capitalized servicing rights measured at fair value with change in fair value recognized in net income. Servicing Asset, Unrealized Gain Loss Capitalized mortgage loan servicing rights, net gains (losses) Loans which are measured for impairment using the fair value of collaterals. Collateral dependent loans, carrying amount Amount of unrealized gain (loss) on loans held for sale measured at fair value with change in fair value recognized in net income. Loans Held-for-sale, Unrealized Gain Loss Loans held for sale, net gains (losses) The valuation allowance on loans measured for impairment, using the fair value of collaterals. Collateral dependent loans, valuation allowance Represents the difference between the aggregate fair value and aggregate remaining contractual principal balance for loans held for sale Difference In Aggregate Fair Value And Aggregate Remaining Contractual Principal Balance For Loans Held For Sale [Table Text Block] Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance for Loans Held for Sale Class of assets, impaired loans. Impaired Loans [Member] Impaired Loans [Member] Refers to the other real estate of loan portfolios. Other Real Estate [Member] Other Real Estate [Member] Capitalized mortgage loan servicing rights, fair value disclosure. Capitalized Mortgage Loan Servicing Rights Fair Value Disclosure. Capitalized mortgage loan servicing rights Impaired loans [Abstract] Impaired loans [Abstract] Fair Value Assets Measured On Recurring Basis Gain Loss Realized And Unrealized [Abstract] Total gains (losses) realized and unrealized [Abstract] Measurement input using float rate to determine fair value. Measurement Input, Float Rate [Member] Float Rate [Member] Measurement input using ancillary income to determine present value of future cash flows. Measurement Input, Ancillary Income [Member] Ancillary Income [Member] Measurement input using cost to service to determine present value of future cash flows. Measurement Input, Cost to Service Approach [Member] Cost to Service [Member] Fair value amount of other real estate taken in settlement of troubled loans through surrender or foreclosure. Real Estate, Other Other real estate fair value Amount of investment in impaired loans measured at fair value. Impaired Loans, Fair Value Impaired loans fair value Value of input used to measure real estate owned by financial institution by financial institution. Other Real Estate, Measurement Input Other real estate measurement input Represents the other real estate mortgage. Other Real Estate Mortgage [Member] Other Real Estate Mortgage [Member] Refers to the capitalized mortgage loan servicing rights. Capitalized Mortgage Loan Servicing Rights [Member]