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Weighted average / Range of discounts (percent) Foreclosed Assets and Other Real Estate, Measurement Input Foreclosed Assets and Other Real Estate, Measurement Input Allowance for credit losses on held-to-maturity securities Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] 30-59 Days Past Due Financial Asset, 30 to 59 Days Past Due [Member] Entity Tax Identification Number Entity Tax Identification Number Cash and cash equivalents Cash and Due from Banks Summary of Past Due Loans Financing Receivable, Past Due [Table Text Block] Current Loans Current Financial Asset, Not Past Due [Member] Credit Loss Status [Axis] Credit Loss Status [Axis] Noninterest Income Noninterest Income [Abstract] Cash and cash equivalents, beginning Cash and cash equivalents, ending Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Total FHLB advances Federal Home Loan Bank, Advances, Weighted Average Interest Rate Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Income from bank-owned 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] Non-NEOs Non-NEOs [Member] 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] Allowance for credit losses: Financing Receivable, Allowance for Credit Loss [Roll Forward] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Fair Value, Measurement Frequency [Domain] Measurement Frequency [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Non-cash compensation Share-Based Payment Arrangement, Noncash Expense Interest Expense Interest Expense, Operating and Nonoperating [Abstract] Compensation and benefits Labor and Related Expense (Increase) decrease in loans, net Payments for (Proceeds from) Loans and Leases Proceeds from maturities, prepayments and calls on securities held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Available for sale, After Five Years through Ten Years, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Basic (in usd per share) Basic earnings per common share (in usd per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Purchase of Company’s common stock Payments for Repurchase of Common Stock Range [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term Federal Home Loan Bank advances Long-Term Federal Home Loan Bank Advances Amount of Gain (Loss) Recognized in OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Award Type [Axis] Award Type [Axis] Interest rate contracts Interest Rate Contract [Member] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Commercial and residential properties Real Estate [Member] Retained earnings Retained Earnings (Accumulated Deficit) Consumer Consumer Portfolio Segment [Member] Cash surrender value of bank-owned life insurance Bank Owned Life Insurance Product and Service [Axis] Product and Service [Axis] Foreclosed real estate assets Repossessed Assets 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] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common stock Common Stock [Member] 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] Gross charge-offs, origination year - 4 years prior to current fiscal year Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Cover [Abstract] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] 30-89 Days Past Due Financial Asset, 30 to 89 Days Past Due [Member] Financial Asset, 30 to 89 Days Past Due Derivative Contract [Domain] Derivative Contract [Domain] Gross charge-offs, origination year - 1 year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Nonrecurring Basis Receivable [Policy Text Block] Equity Awards Adjustments Equity Awards Adjustments [Member] Total Past Due Financial Asset, Past Due [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Total Liabilities and Shareholders’ Equity Liabilities and Equity Goodwill and core deposit intangibles Intangible Asset, Including Goodwill, after Accumulated Amortization Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Stock options Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Reclassification adjustment for income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Revolving Loans Converted to Term Loans Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Pass Pass [Member] Summary of Loans, Net of Unearned Income Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Construction and land Construction And Land Portfolio Segment [Member] Construction and land. Long-term Debt and Borrowings Long-Term Debt [Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Preferred stock, $0.01 par value - 10,000,000 shares authorized; none issued Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Advances from FHLB average balance Advances From Federal Home Loan Bank Average Balance Advances From Federal Home Loan Bank Average Balance Hedging Designation [Domain] Hedging Designation [Domain] Decrease in average balance of FHLB advances Increase (Decrease) in Loans from Federal Home Loan Banks Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid on deposits and borrowed funds Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Forms, printing and supplies Supplies and Postage Expense Hedging Designation [Axis] Hedging Designation [Axis] 60-89 Days Past Due Financial Asset, 60 to 89 Days Past Due [Member] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total Assets, Fair Value Disclosure Loss duration (in months) Debt Securities, Available-for-Sale, Period Of Continuous Loss Position For Investment Securities Period of continuous loss position for investment securities. Proceeds from sale of foreclosed assets Proceeds from Sale of Foreclosed Assets Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Loans, including fees Interest and Fee Income, Financing Receivable Additional Paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Accounts receivable, Inventory and Equipment Equipment [Member] Name Trading Arrangement, Individual Name Subordinated debt expense Interest Expense, Subordinated Notes and Debentures Short-term FHLB advances Federal Home Loan Bank, Advance, Maturity, Year One Company Selected Measure Amount Company Selected Measure Amount Financing Receivables, Period Past Due [Axis] Financial Asset, Aging [Axis] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Deposits: Deposits [Abstract] Commercial and industrial Commercial And Industrial Portfolio Segment [Member] Commercial and industrial. Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Increase in cash surrender value of bank-owned life insurance Life Insurance, Corporate or Bank Owned, Change in Value Collectively evaluated for impairment, including unfunded lending commitments, total allowance for credit losses Financing Receivable, Allowance for Credit Loss, Collectively Evaluated Derivative liabilities Derivative Liability Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense Income Tax Expense (Benefit) Total noninterest expense Noninterest Expense Award Timing Method Award Timing Method [Text Block] Net change in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Charge-offs Total Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Numerator: Net Income (Loss) Attributable to Parent [Abstract] Notional Amount Derivative Liability, Notional Amount Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Net Income Net income Net income available to common shareholders Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Proceeds from sale of office properties and equipment Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Schedule of Financing Receivables Past Due [Table] Financing Receivable, Past Due [Table] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Origination year - 1 year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Summary of Information Pertaining to Non-accrual Financing Receivable, Nonaccrual [Table Text Block] Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Gross derivative assets Derivative Asset, Subject to Master Netting Arrangement, before Offset One- to four-family first mortgage One To Four Family First Mortgage Portfolio Segment [Member] One to four family first mortgage. Unallocated common stock held by: Unallocated Common Stock Held By [Abstract] Unallocated common stock held by. Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]