Equity [Abstract] Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Receivables [Abstract] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Domain] Troubled Debt Restructured Loans Troubled Debt Restructured Loans [Member] Troubled debt restructured loans. Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Commercial Business Commercial Portfolio Segment [Member] Real Estate Construction and Land Development Real Estate Construction and Land Development [Member] Total real estate construction and land development. Consumer Consumer Portfolio Segment [Member] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Commercial and Industrial Commercial and Industrial [Member] Commercial and industrial. Owner-Occupied Commercial Real Estate Owner Occupied Commercial Real Estate [Member] Owner occupied commercial real estate. Non-owner Occupied Commercial Real Estate Non Owner Occupied Commercial Real Estate [Member] Non owner occupied commercial real estate. One-to-four Family Real Estate Construction One to Four Family Real Estate Construction [Member] One to Four Family Real Estate Construction [Member] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Modified During the Quarter Modified during the quarter [Member] Modified during the quarter [Member] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] Past Modified Maturity Date Past Modified Maturity Date [Member] Past Modified Maturity Date [Member] 90 Days or Greater Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Finance Receivable Modified Subsequent Default Finance Receivable Modified Subsequent Default [Member] Finance Receivable Modified Subsequent Default [Member] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Loans Modified as Troubled Debt Restructurings [Abstract] Loans Modified as Troubled Debt Restructurings [Abstract] Loans Modified as Troubled Debt Restructurings [Abstract] Number of Contracts Financing Receivable, Modifications, Number of Contracts Outstanding Principal Balance Financing Receivable, Modifications, Post-Modification Recorded Investment Related specific valuation allowance Impaired Financing Receivable, Related Allowance Number of contracts modified Financing Receivable, Modifications, Subsequent Default, Number of Contracts Performing TDRs, TDR loans Financing Receivable Modifications Accruing Recorded Investment Financing Receivable Modifications Accruing Recorded Investment Nonaccrual TDRs, TDR loans Financing Receivable Modifications Non Accruing Recorded Investment Financing Receivable Modifications Non Accruing Recorded Investment Performing TDRs, Allowance for loan losses on TDR loans Allowance for Loan Losses on Financing Receivable Modifications Accruing Recorded Investment Allowance for Loan Losses on Financing Receivable Modifications Accruing Recorded Investment Nonaccrual TDRs, Allowance for loan losses on TDR loans Allowance for Loan Losses on Financing Receivable Modifications Non Accruing Recorded Investment Allowance for Loan Losses on Financing Receivable Modifications Non Accruing Recorded Investment Unfunded commitments related to credits classified as TDRs Loans and Leases Receivable, Impaired, Commitment to Lend Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] One-to-four Family Residential Residential Portfolio Segment [Member] Five or More Family Residential and Commercial Properties [Member] Five or More Family Residential and Commercial Properties [Member] Five or more family residential and commercial properties. Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Outstanding Principal Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance Recorded Investment Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount The recorded balance after any applicable reductions (i.e. outstanding balance net of unamortized accretable yield). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. Investments, Debt and Equity Securities [Abstract] Schedule of securities available for sale Available-for-sale Securities [Table Text Block] Schedule of maturities of investment securities Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] Schedule of fair value and unrealized losses of available for sale investment securities Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Schedule of realized gains and losses on sale of securities available for sale Schedule of Realized Gain (Loss) [Table Text Block] Scheduled of amortized cost and fair value of securities pledged as collateral Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] Nonaccrual Nonaccrual [Member] nonaccrual [Member] Restructured Performing Restructured Performing [Member] Restructured Performing [Member] Recorded Investment With No Specific Valuation Allowance Impaired Financing Receivable, with No Related Allowance, Recorded Investment Recorded Investment With Specific Valuation Allowance Impaired Financing Receivable, with Related Allowance, Recorded Investment Total Recorded Investment Impaired Financing Receivable, Recorded Investment Unpaid Contractual Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Related Specific Valuation Allowance Average recorded investment on impaired loans Impaired Financing Receivable, Average Recorded Investment Interest income recognized on impaired loans Impaired Financing Receivable, Interest Income, Accrual Method Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Unallocated Unallocated [Member] Unallocated. Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Schedule of changes in allowance for loan losses Allowance for Loan and Lease Losses [Roll Forward] Balance at Beginning of Period Loans and Leases Receivable, Allowance Charge-offs Allowance for Loan and Lease Losses, Write-offs Recoveries Allowance for Loan and Lease Loss, Recovery of Bad Debts Provision for Loan Losses Provision for Loan and Lease Losses Balance at End of Period Gross realized gains Debt Securities, Available-for-sale, Realized Gain Gross realized losses Debt Securities, Available-for-sale, Realized Loss Net realized gains Debt Securities, Available-for-sale, Realized Gain (Loss) Class of Treasury Stock [Table] Class of Treasury Stock [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Shares Related to Withholding Taxes on the Vesting of Restricted Stock Shares Related to Withholding Taxes on the Vesting of Restricted Stock [Member] Shares Related to Withholding Taxes on the Vesting of Restricted Stock [Member] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Repurchased shares to pay withholding taxes (in shares) Stock Repurchased During Period, Shares Stock repurchase to pay withholding taxes average share price (in usd per share) Treasury Stock Acquired, Average Cost Per Share Number of shares repurchased related to withholding taxes due on accelerated vesting of RSUs (in shares) Business Combination, Shares Issued in Merger but Forfeited to Pay Taxes Business Combination, Shares Issued in Merger but Forfeited to Pay Taxes Average share price (in usd per share) Business Acquisition, Share Price Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Core Deposits Core Deposits [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Premier Commercial Bancorp Premier Commercial Bancorp [Member] Premier Commercial Bancorp [Member] Puget Sound Bancorp Puget Sound Merger [Member] Puget Sound Merger [Member] Washington Banking Company Washington Banking [Member] Washington Banking [Member] Valley Community Bancshares Valley Community Bancshares [Member] Valley Community Bancshares [Member] Northwest Commercial Bank Northwest Commercial Bank [Member] Northwest commercial bank. Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Useful life Finite-Lived Intangible Asset, Useful Life Debt Disclosure [Abstract] Federal Funds Purchased Federal Funds Purchased Average balance during the period Federal Home Loan Bank, Advances, Activity for Year, Average Balance of Agreements Outstanding Maximum month-end balance during the period Federal Home Loan Bank Advances Activity For Period Maximum Outstanding At Any Month End Federal Home Loan Bank Advances Activity For Period Maximum Outstanding At Any Month End Weighted average rate during the period Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year Number of loan segments Number of Loan Segments Number of loan segments. Gross loans receivable Loans and Leases Receivable, Gross Net deferred loan costs Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Loans receivable, net Loans and Leases Receivable, Net of Deferred Income Allowance for loan losses Total loans receivable, net Loans and Leases Receivable, Net Amount Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Modified during the quarter [Member] Past Modified Maturity Date [Member] Financing Receivable, Modifications, Number of Contracts Number of Contracts Recorded Investments Financing Receivable, Modifications, Subsequent Default, Recorded Investment Investment Holdings [Table] Investment Holdings [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] U.S. Treasury and U.S. Government-sponsored agencies US Treasury and Government [Member] Municipal securities Municipal Bonds [Member] Residential Residential Mortgage Backed Securities [Member] Commercial Commercial Mortgage Backed Securities [Member] Corporate obligations Corporate Debt Securities [Member] Other asset-backed securities Other Security Investments [Member] Investment Holdings [Line Items] Investment Holdings [Line Items] Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Fair Value Debt Securities, Available-for-sale Fair Value Disclosures [Abstract] Fair value measurements of assets on a recurring basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Fair value measurements of assets on a nonrecurring basis Fair Value Measurements, Nonrecurring [Table Text Block] Fair value measurements for financial instruments measured at fair value on a non-recurring basis Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] Schedule of carrying value and fair value of financial instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Schedule of carrying value and fair value of financial instruments Financial Instruments Financial Assets and Liabilities Balance Sheet Groupings [Abstract] Financial instruments financial assets and liabilities balance sheet groupings. Financial Assets: Assets [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Investment securities available for sale Investments, Fair Value Disclosure Federal Home Loan Bank stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Loans held for sale Loans Held-for-sale, Fair Value Disclosure Total loans receivable, net Loans Receivable, Fair Value Disclosure Accrued interest receivable Accounts Receivable, Fair Value Disclosure Derivative assets - interest rate swaps Interest Rate Derivative Assets, at Fair Value Equity security Equity Securities, FV-NI Financial Liabilities: Liabilities and Equity [Abstract] Noninterest deposits, interest bearing demand deposits, money market accounts and savings accounts Deposits, Fair Value Disclosure Certificate of deposit accounts Interest-bearing Domestic Deposit, Certificates of Deposits Federal Home Loan Bank advances Federal Home Loan Bank Borrowings, Fair Value Disclosure Securities sold under agreement to repurchase Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Junior subordinated debentures Subordinated Debt Obligations, Fair Value Disclosure Accrued interest payable Accrued Liabilities, Fair Value Disclosure Derivative liabilities - interest rate swaps Interest Rate Derivative Liabilities, at Fair Value Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Common stock Common Stock [Member] Retained earnings Retained Earnings [Member] Accumulated other comprehensive income (loss), net AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance, shares Shares, Outstanding Beginning balance Stockholders' Equity Attributable to Parent Restricted stock awards forfeited, shares Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Restricted stock units vested, net of forfeitures of restricted stock awards Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Exercise of stock options, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition Common stock repurchased, shares Stock Repurchased and Retired During Period, Shares Common stock repurchased Stock Repurchased and Retired During Period, Value Net income Net Income (Loss) Attributable to Parent Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Common stock issued in business combinations, shares Stock Issued During Period, Shares, Acquisitions Common stock issued in business combinations Stock Issued During Period, Value, Acquisitions Cash dividends declared on common stock Dividends, Common Stock, Cash Effects of implementation of accounting change related to operating leases Cumulative Effect of New Accounting Principle in Period of Adoption Ending balance, shares Ending balance Other Borrowings Debt Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Business Description and Basis of Presentation [Table] Business Description and Basis of Presentation [Table] Business description and basis of presentation. Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Heritage Bank Heritage Bank [Member] Heritage bank. Business Description and Basis of Presentation [Line Items] Business Description and Basis of Presentation [Line Items] Business description and basis of presentation. Number of branches operating Number of Branches Operating Number of branches operating. Real Estate [Abstract] Changes in other real estate owned Other Real Estate, Roll Forward [Table Text Block] Stockholders' Equity Note [Abstract] Schedule of earnings per share reconciliation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of dividends activity Dividends Declared [Table Text Block] Schedule of repurchased shares Class of Treasury Stock [Table Text Block] Leases [Abstract] 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Minimum lease payments Operating Leases, Future Minimum Payments Due Fair Value Measurements Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Loans and Leases Receivable Disclosure [Abstract] Financing Receivables [Text Block] Financing Receivables [Text Block] Loans Receivable Troubled Debt Restructurings on Financing Receivables [Table Text Block] Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Pass Financing Receivables Pass Rated Financing receivables pass rated. OAEM Financing Receivables OAEM Rated Financing Receivables OAEM rated. Substandard Financing Receivables Substandard Rated Financing receivables substandard rated. Doubtful/Loss Financing Receivables Doubtful Rated Financing receivables doubtful rated. Total Potential problem loans receivable Potential Problem Loans Receivable Potential problem loans receivable. Allowance for Loan Losses Allowance for Credit Losses [Text Block] Business Combinations [Abstract] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Domain] Nonrecurring Adjustment [Domain] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Acquisition, Pro Forma Information [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Leases Lessee, Operating Leases [Text Block] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Fair Value, Measurements, Recurring [Member] Interest rate swap Interest Rate Swap [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Total investment securities available for sale Derivative assets - interest rate swaps Derivative Asset, Fair Value, Gross Asset Derivative liabilities - interest rate swaps Derivative Liability, Fair Value, Gross Liability New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Capitalization threshold policy, contractual lease payments (or less) Capitalization Threshold Policy, Contractual Lease Payments Capitalization Threshold Policy, Contractual Lease Payments Right of use assets Operating Lease, Right-of-Use Asset Lease liabilities Operating Lease, Liability Effects of implementation of accounting change related to operating leases Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Increase (Decrease) in Accumulated Other Comprehensive (Loss) Income [Roll Forward] Other comprehensive (loss) income before reclassification Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts reclassified from AOCI for gain on sale of investment securities available for sale included in net income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other comprehensive income (loss) Fair value assets transfers between level 1 and level 2 transfer amount Fair Value Assets Transfers Between Level 1 and Level 2 Transfers Amount Fair value assets transfers between level 1 and level 2 transfers amount. Schedule of allowance for loan losses on the basis of impairment method Loans Individually Evaluated for Impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Loans Collectively Evaluated for Impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment PCI Loans Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment Total Allowance for Loan Losses Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Schedule of FHLB advances Federal Home Loan Bank, Advances [Table Text Block] Statement of Financial Position [Abstract] Preferred stock, no par value (in usd per share) Preferred Stock, No Par Value Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Common stock, no par value (in usd per share) Common Stock, No Par Value Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Lease ROU assets Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Schedule of earnings per share reconciliation Schedule of Earnings Per Share Reconciliation [Abstract] Schedule of earnings per share reconciliation. Net income: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Net income Dividends and undistributed earnings allocated to participating securities Dividends and Undistributed Earnings Dividends and undistributed earnings. Net income allocated to common shareholders Undistributed Earnings, Diluted Basic: Weighted Average Number of Shares Outstanding, Basic [Abstract] Weighted average common shares outstanding (in shares) Gross Weighted Average Number of Shares Outstanding Basic Gross weighted average number of shares outstanding basic. Less: Restricted stock awards (in shares) Weighted Average Number of Shares, Restricted Stock Total basic weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic weighted average common shares outstanding (in shares) Effect of potentially dilutive common shares (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Total diluted weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Statement of Comprehensive Income [Abstract] Change in fair value of securities available for sale, tax Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Reclassification adjustment of net gain from sale of investment securities included in income, tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Disclosure of Repurchase Agreements [Abstract] Securities Sold Under Agreement to Repurchase Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] 2019 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Implied interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Right of use liability Banking and Thrift [Abstract] Cash Requirement Regulatory Cash Requirements Under Banking Regulations [Text Block] Regulatory Cash Requirements Under Banking Regulations [Text Block] Cash paid for amounts included in the measurement of lease liabilities Operating Lease, Payments ROU assets obtained in exchange for lease liabilities, excluding adoption impact Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operating Lease Cost Operating Lease, Cost Variable Lease Cost Variable Lease, Cost Sublease Income Sublease Income Total lease cost Lease, Cost Operating Lease, Payments Weighted average remaining lease term of operating leases in years ASSETS Cash on hand and in banks Cash and Due from Banks Interest earning deposits Interest-bearing Deposits in Banks and Other Financial Institutions Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Investment securities available for sale, at fair value Available-for-sale Securities Loans held for sale Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Loans receivable, net Allowance for loan losses Total loans receivable, net Other real estate owned Other Real Estate Premises and equipment, net Property, Plant and Equipment, Net Federal Home Loan Bank stock, at cost Federal Home Loan Bank Stock Bank owned life insurance Bank Owned Life Insurance Accrued interest receivable Interest Receivable Prepaid expenses and other assets Prepaid Expense and Other Assets Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Deposits Deposits Federal Home Loan Bank advances Long-term Federal Home Loan Bank Advances Junior subordinated debentures Junior Subordinated Notes Securities sold under agreement to repurchase Securities Sold under Agreements to Repurchase Accrued expenses and other liabilities Other Liabilities Total liabilities Liabilities Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, no par value, 2,500,000 shares authorized; no shares issued and outstanding at September 30, 2019 and December 31, 2018 Preferred Stock, Value, Issued Common stock, no par value, 50,000,000 shares authorized; 36,618,381 and 36,874,055 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively Common Stock, Value, Issued Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss), net Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Commercial Business Financing Receivable, Individually Evaluated for Impairment Financing Receivable, Individually Evaluated for Impairment Impaired Financing Receivable, Recorded Investment Schedule of loan receivables on the basis of impairment method Schedule of Loan Receivables on Basis of Impairment Method [Abstract] Schedule of loan receivables on basis of impairment method. Loans Collectively Evaluated for Impairment Financing Receivable, Collectively Evaluated for Impairment Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Total Gross Loans Receivable Repurchase agreement obligations by class of collateral pledged Schedule of Repurchase Agreements [Table Text Block] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Loans Receivable Excluding PCI Loans Loans Receivable Excluding PCI Loans [Member] Loans Receivable Excluding PCI Loans [Member] 30-89 Days Financing Receivables, 30 to 89 Days Past Due [Member] Financing Receivables, 30 to 89 Days Past Due [Member] Credit Loss Status [Axis] Credit Loss Status [Axis] Credit Loss Status [Domain] Credit Loss Status [Domain] PCI Loans Purchase Credit Impaired Loans [Member] Purchase Credit Impaired Loans [Member] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Total Past Due Financing Receivable, Recorded Investment, Past Due Current Financing Receivable, Recorded Investment, Current Total Gross Loan and Lease Receivable net of PCI Loans Gross Loan and Lease Receivable net of PCI Loans 90 days or more and still accruing Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Description of Business Nature of Operations [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating Leases Policy Lessee, Leases [Policy Text Block] Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Eleventh Stock Repurchase Plan Eleventh Stock Repurchase Plan [Member] [Member] Eleventh Stock Repurchase Plan [Member] [Member] Class of Stock [Line Items] Class of Stock [Line Items] Anti-dilutive securities excluded from computation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Stockholders Equity (Textual) [Abstract] Stockholders Equity (Textual) [Abstract] Stockholders Equity (Textual) [Abstract] Outstanding share percent Stock Repurchase Program Percentage of Outstanding Shares Authorized for Repurchase Stock repurchase program percentage of outstanding shares authorized for repurchase. Outstanding common shares in the plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Number of shares repurchased (in shares) Withholding taxes average price per share (in usd per share) Federal Home Loan Bank, Advances [Table] Federal Home Loan Bank, Advances [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Federal Reserve Bank Advances Federal Reserve Bank Advances [Member] Federal Home Loan Bank, Advances [Line Items] Federal Home Loan Bank, Advances [Line Items] Credit facility with the FHLB Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available FHLB advances outstanding Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances Unencumbered collateral in amount equal to varying percentages Unencumbered collateral in amount equal to varying percentages Unencumbered collateral in amount equal to varying percentages Maximum federal funds purchases Advance Line Maintained to Purchase Federal Funds Advance Line Maintained to Purchase Federal Funds Federal funds purchased Credit facility with the Federal Reserve Bank of San Francisco Line of Credit Facility, Maximum Borrowing Capacity Borrowings outstanding Line of Credit Facility, Fair Value of Amount Outstanding Financing Receivable Credit Quality Indicators [Table Text Block] Financing Receivable Credit Quality Indicators [Table Text Block] Past Due Financing Receivables [Table Text Block] Past Due Financing Receivables [Table Text Block] Schedule of Impaired Purchased Loans Accretable Yield [Table Text Block] Schedule of Impaired Purchased Loans Accretable Yield [Table Text Block] Schedule of impaired purchased loans accretable yield. Impaired Financing Receivables [Table Text Block] Impaired Financing Receivables [Table Text Block] Schedule of nonaccrual loans Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Schedule of average recorded investment impaired loans including restructuring loans Schedule of Average Recorded Investment Impaired Loans Including Restructuring Loans [Table Text Block] Schedule of average recorded investment impaired loans including restructuring loans. Recorded investment balance and related allowance for loan losses of accruing and non-accruing TDRs Troubled Debt Restructurings of Financing Receivables on Basis of Accruing and Non Accruing [Table Text Block] Troubled debt restructurings of financing receivables on basis of accruing and non accruing. Troubled debt restructurings on financing receivables Troubled debt restructuring loans, subsequently defaulted Troubled Debt Restructurings Loans Subsequently Defaulted [Table Text Block] Troubled debt restructurings loans subsequently defaulted. Purchased impaired loans Schedule of Financing Receivables Loans Acquired with Credit Deterioration [Table Text Block] Schedule of financing receivables loans acquired with credit deterioration. Repurchase agreements, maturity period Repurchase Agreements, Maturity Period Repurchase Agreements, Maturity Period Financial Instruments Owned and Pledged as Collateral [Table] Financial Instruments Owned and Pledged as Collateral [Table] Financial Instruments Owned and Pledged as Collateral [Line Items] Financial Instruments Owned and Pledged as Collateral [Line Items] Repurchase agreement obligations Dividends Payable [Table] Dividends Payable [Table] Dividends [Axis] Dividends [Axis] Dividends [Domain] Dividends [Domain] Special Dividend Special Dividend [Member] Special Dividend [Member] Dividends Payable [Line Items] Dividends Payable [Line Items] Declared Dividends Payable, Date Declared Cash Dividend per Share (in usd per share) Common Stock, Dividends, Per Share, Declared Record Date Dividends Payable, Date of Record Paid Date Dividends Payable, Date to be Paid Statement of Cash Flows [Abstract] noncash or part noncash acquisition, securities sold under agreements to repurchase noncash or part noncash acquisition, securities sold under agreements to repurchase Noncash or Part Noncash Acquisition, Securities Sold Under Agreements to Repurchase Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation of premises and equipment, amortization of securities available for sale, and amortization of discount of junior subordinated debentures Depreciation, Amortization and Accretion, Net Changes in net deferred loan costs, net of amortization Amortization of Deferred Loan Origination Fees, Net Provision for loan losses Net change in accrued interest receivable, prepaid expenses and other assets, and accrued expenses and other liabilities Net Change in Accrued Interest Receivable, Prepaid Expenses and Other Assets, Accrued Expenses and Other Liabilities Net change in accrued interest receivable, prepaid expenses and other assets, accrued expenses and other liabilities. Stock-based compensation expense Employee Benefits and Share-based Compensation Amortization of intangible assets Amortization of Intangible Assets Origination of mortgage loans held for sale Payments for Origination and Purchases of Loans Held-for-sale Proceeds from sale of mortgage loans Proceeds from Sale of Loans Held-for-sale Earnings on bank owned life insurance Bank Owned Life Insurance Income Valuation adjustment on other real estate owned Other Real Estate, Valuation Adjustments Loss on sale of other real estate owned, net Gains (Losses) on Sales of Other Real Estate Gain on sale of loans, net Gain (Loss) on Sale of Loans and Leases Gain on sale of investment securities, net Gain (Loss) on Sale of Investments Gain (Loss) of Assets Held for Sale Gain (Loss) of Assets Held for Sale Gain (Loss) of Assets Held for Sale Impairment of assets held for sale Asset Impairment Charges Impairment of right of use asset Impairment of Long-Lived Assets to be Disposed of (Gain) loss on sale of premises and equipment, net Gain (Loss) on Disposition of Property Plant Equipment Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Loans originated, net of principal payments Payments for (Proceeds from) Loans and Leases Maturities, calls and payments of investment securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Purchase of investment securities available for sale Payments to Acquire Available-for-sale Securities Proceeds from sales of investment securities available for sale Proceeds from Sale of Available-for-sale Securities Purchase of premises and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from sale of other loans Proceeds from Sales of Assets, Investing Activities Proceeds from sale of other real estate owned Proceeds from Sale of Foreclosed Assets Proceeds from Sale of Assets Held for Sale Proceeds from Sale of Assets Held for Sale Proceeds from Sale of Assets Held for Sale Proceeds from redemption of Federal Home Loan Bank stock Payments for (Proceeds from) Federal Home Loan Bank Stock Purchases of Federal Home Loan Bank stock Payments to Acquire Federal Home Loan Bank Stock Proceeds from sales of premises and equipment Proceeds from Sale of Property, Plant, and Equipment Purchase bank owned life insurance Purchase bank owned life insurance Purchase bank owned life insurance Capital contributions to low-income housing tax credit partnerships and new market tax credit partnerships, net Change in low income tax housing tax credit partnership Change in low income tax housing tax credit partnership Net cash received from acquisitions Cash Acquired from Acquisition Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net increase in deposits Increase (Decrease) in Deposits Federal Home Loan Bank advances Increase (Decrease) in Loans to Federal Home Loan Banks Repayment of Federal Home Loan Bank advances Repayments of Debt Common stock cash dividends paid Payments of Ordinary Dividends, Common Stock Net decrease in securities sold under agreement to repurchase Increase (Decrease) in Receivables under Repurchase Agreements Proceeds from exercise of stock options Proceeds from Stock Options Exercised Repurchase of common stock Payments for Repurchase of Common Stock Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for income taxes Income Taxes Paid, Net Supplemental non-cash disclosures of cash flow information: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Transfers of loans receivable to other real estate owned Real Estate Owned, Transfer to Real Estate Owned Transfers of properties held for sale recorded in premises and equipment, net to prepaid expenses and other assets Transfer of Property and Equipment to Prepaid Expenses and Other Assets Held-for-sale Transfer of Property and Equipment to Prepaid Expenses and Other Assets Held-for-sale Transfer of bank owned life insurance to prepaid expenses and other assets Transfer of Bank Owned Life Insurance To Prepaid Expenses And Other Assets Transfer of Bank Owned Life Insurance To Prepaid Expenses And Other Assets Business Combinations: Common stock issued for business combinations Assets acquired (liabilities assumed) in acquisitions: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Investment securities available for sale Noncash or Part Noncash Acquisition Investment Available for Sale Noncash or part noncash acquisition investment available for sale. Loans receivable Noncash or Part Noncash Acquisition Purchased Non Covered Loans Receivable Noncash or part noncash acquisition purchased non covered loans receivable. Noncash or Part Noncash Acquisition Other Real Estate Owned Noncash or Part Noncash Acquisition Other Real Estate Owned Noncash or part noncash acquisition other real estate owned. Premises and equipment Noncash or Part Noncash Acquisition, Fixed Assets Acquired Federal Home Loan Bank stock Noncash or Part Noncash Acquisition Accounts FHLB Stock Acquired Noncash or part noncash acquisition accounts FHLB stock acquired. Accrued interest receivable Noncash or Part Noncash Acquisition, Accounts Receivable Acquired Bank owned life insurance Noncash or Part Noncash, Bank Owned Life Insurance acquired Noncash or Part Noncash, Bank Owned Life Insurance acquired Prepaid expenses and other assets Noncash or Part Noncash Acquisition, Other Assets Acquired Other intangible assets Noncash or Part Noncash Acquisition, Intangible Assets Acquired Deposits Noncash or Part Noncash Acquisition Deposits Liability Noncash or part noncash acquisition deposits liability. Accrued expenses and other liabilities Noncash or Part Noncash Acquisition, Other Liabilities Assumed Noncash or Part Noncash Acquisition, Debt Assumed Noncash or Part Noncash Acquisition, Debt Assumed Investment in low income housing tax partnership Investment in low income housing tax partnership Investment in low income housing tax partnership Purchase of investment securities available for sale not settled Purchase of investment securities available for sale not settled Purchase of investment securities available for sale not settled Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 12 Months or Longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Total Debt Securities, Available-for-sale, Unrealized Loss Position Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 Months or Longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Puget Sound Puget Sound Bank [Member] Puget Sound Bank [Member] Premier Commercial Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Revenue Goodwill Goodwill, Acquired During Period Acquisition-related costs Business Combination, Acquisition Related Costs Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Earnings Per Share, Basic Business Acquisition, Pro Forma Earnings Per Share, Basic Business Acquisition, Pro Forma Earnings Per Share, Diluted Business Acquisition, Pro Forma Earnings Per Share, Diluted Other real estate owned resulting from foreclosure and repossession of assets Other Real Estate, Foreclosed Assets, and Repossessed Assets Mortgage loans in process of foreclosure Mortgage Loans in Process of Foreclosure, Amount Changes in other real estate owned Other Real Estate [Roll Forward] Balance at the beginning of the period Additions Other Real Estate, Additions Proceeds from dispositions Other Real Estate, Disposals Gain (loss) on sales, net Valuation adjustment Balance at the end of the period Required reserve balance Restricted Cash and Cash Equivalents Schedule of notional amounts and estimated fair values of interest rate derivative contracts Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Other securities pledged Other Securities Pledged [Member] Other Securities Pledged [Member] Federal Reserve Bank and Federal Home Loan Bank to Secure Borrowings [Member] Federal Reserve Bank and Federal Home Loan Bank to Secure Borrowings [Member] Federal reserve bank and federal home loan bank to secure borrowings. Washington and Oregon State to Secure Public Deposits [Member] Washington and Oregon State to Secure Public Deposits [Member] Washington and Oregon state to secure public deposits. Repurchase Agreements [Member] Repurchase Agreements [Member] Investment Holding [Axis] Investment Holding [Axis] Investment Holding [Domain] Investment Holding [Domain] Washington and Oregon state public deposits Securities sold under agreement to repurchase Scheduled of amortized cost and fair value of securities pledged as collateral Scheduled of Amortized Cost and Fair Value of Securities Pledged as Collateral [Abstract] Scheduled of amortized cost and fair value of securities pledged as collateral. Amortized Cost Deposit Liabilities, Collateral Issued, Financial Instruments Fair Value Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value Pledged Assets Separately Reported Securities Pledged as Collateral Amortized Cost Pledged Assets Separately Reported Securities Pledged as Collateral Amortized Cost Pledged assets separately reported securities pledged as collateral amortized cost. Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Finite-lived Intangible Assets [Roll Forward] Finite-lived Intangible Assets [Roll Forward] Balance at the beginning of the period Intangible Assets, Gross (Excluding Goodwill) Additions as a result of acquisitions Intangible Assets Acquired Intangible Assets Acquired Amortization Balance at the end of the period PCI Loans Purchase Credit Impaired Loans [Member] [Domain] Purchase Credit Impaired Loans [Member] [Domain] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Balance at the beginning of the period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Accretion Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Disposal and other Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans Reclassification from nonaccretable difference Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications (to) from Nonaccretable Difference Balance at the end of the period Summary of net lease cost and other related information Lease, Cost [Table Text Block] Lease payment obligations Lessee, Operating Lease, Liability, Maturity [Table Text Block] Estimated future minimum annual rental commitments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Concentration of loans greater than 10% Concentration Risk Percentage Greater than Ten Percent Concentration risk percentage greater than ten percent. Percentage of concentrations of loans in any industry (in excess of 10%) (percent) Concentration Risk, Percentage Change in goodwill Schedule of Goodwill [Table Text Block] Change in other intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Gross nonaccrual loans Financing Receivable, Recorded Investment, Nonaccrual Status Schedule of weighted average rate of junior subordinated debentures Schedule Of Weighted Average Rate Of Debt [Table Text Block] Schedule Of Weighted Average Rate Of Debt [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Washington Banking Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Junior Subordinated Debentures Junior Subordinated Debt [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Assumed trust preferred securities and junior subordinated debentures, fair value Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Trust Preferred Securities and Junior Subordinated Debentures Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Trust Preferred Securities and Junior Subordinated Debentures Adjustable rate of trust preferred securities Adjustable rate of trust preferred securities Adjustable rate of trust preferred securities Weighted average rate Debt Instrument, Interest Rate During Period Amortized Cost Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Due after ten years Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost Fair Value Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Due after ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Fair Value Business Combinations Business Combination Disclosure [Text Block] Other Real Estate Owned Real Estate Owned [Text Block] Cover page. Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Junior Subordinated Debentures Securities classified as trading Debt Securities, Trading, and Equity Securities, FV-NI Cash dividends declared on common stock (in usd per share) Income Statement [Abstract] INTEREST INCOME Interest and Dividend Income, Operating [Abstract] Interest and fees on loans Interest and Fee Income, Loans and Leases Taxable interest on investment securities Interest Income, Securities, Operating, Taxable Nontaxable interest on investment securities Interest Income, Securities, Operating, Tax Exempt Interest on other interest earning assets Other Interest and Dividend Income Total interest income Interest and Dividend Income, Operating INTEREST EXPENSE Interest Expense [Abstract] Deposits Interest Expense, Deposits Junior subordinated debentures Interest Expense, Junior Subordinated Debentures Other borrowings Interest Expense, Borrowings Total interest expense Interest Expense Net interest income Interest Income (Expense), Net Provision for loan losses Net interest income after provision for loan losses Interest Income (Expense), after Provision for Loan Loss NONINTEREST INCOME Noninterest Income [Abstract] Service charges and other fees Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions Gain on sale of investment securities, net Debt and Equity Securities, Realized Gain (Loss) Gain on sale of loans, net Gain (Loss) on Sales of Loans, Net Interest rate swap fees Interest Rate Swap Fee Income Interest Rate Swap Fee Income Other income Noninterest Income, Other Total noninterest income Noninterest Income NONINTEREST EXPENSE Noninterest Expense [Abstract] Compensation and employee benefits Labor and Related Expense Occupancy and equipment Occupancy, Net Data processing Communications and Information Technology Marketing Marketing Expense Professional services Professional Fees State/municipal business and use taxes Current State and Local Tax Expense (Benefit) Federal deposit insurance premium Federal Deposit Insurance Corporation Premium Expense Other real estate owned, net Foreclosed Real Estate Expense Other expense Other Noninterest Expense Total noninterest expense Noninterest Expense Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Basic earnings per common share (in usd per share) Earnings Per Share, Basic Diluted earnings per common share (in usd per share) Earnings Per Share, Diluted Dividends declared per common share (in usd per share) Derivative [Table] Derivative [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Non-hedging interest rate derivatives Not Designated as Hedging Instrument [Member] Customers Customers [Member] Customers [Member] Third Parties Third Parties [Member] Third Parties [Member] Derivative [Line Items] Derivative [Line Items] Derivative Asset Derivative Asset [Abstract] Notional Amounts Derivative Asset, Notional Amount Estimated Fair Value Derivative Liability Derivative Liability [Abstract] Notional Amounts Derivative Liability, Notional Amount Estimated Fair Value Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Nonrecurring Fair Value, Measurements, Nonrecurring [Member] Impaired Loans Impaired Loans [Member] Impaired Loans [Member] Weighted Average Weighted Average [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Comparability Adjustment Measurement Input, Comparability Adjustment [Member] Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair value measurements for financial instruments measured at fair value on a non-recurring basis Fair Value Measurement Inputs and Valuation Techniques [Abstract] Impaired loans Range of Inputs Impaired Loans, Measurement Input Impaired Loans, Measurement Input Change in fair value of investment securities available for sale, net of tax of $799, $(887), $5,407, and $(3,525), respectively Reclassification adjustment for net gain from sale of investment securities available for sale included in income, net of tax of $(59), $(17), $(69), and $(29), respectively Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Changes in accumulated other comprehensive (loss) income (AOCI) by component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of changes in allowance for loan losses Allowance for Credit Losses on Financing Receivables [Table Text Block] Schedule of loan receivables on the basis of impairment method Schedule of Financing Receivables for Credit Losses [Table Text Block] Schedule detailing information related to financing receivables by portfolio segment. A portfolio segment is a level at which an entity develops and documents a systematic methodology to determine its allowance for credit losses. Goodwill [Roll Forward] Goodwill [Roll Forward] Balance at the beginning of the period Additions as a result of acquisitions Balance at the end of the period Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair value measurements of assets on a nonrecurring basis Fair Value Assets and Liabilities Measured on Non Recurring Basis [Abstract] Fair value assets and liabilities measured on non recurring basis. Basis Basis for Assets Measured at Fair Value Basis for assets measured at fair value. Fair Value Net Losses (Gains) Recorded in Earnings Fair Value Assets Measured on Nonrecurring Basis Net Gains Losses Included in Earnings Amount of net gains and losses recorded in earnings for nonrecurring assets reported at fair value