Statement of Comprehensive Income [Abstract] Net income Net Income (Loss) Attributable to Parent Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized gain (loss) on securities: Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract] Unrealized holding gain (loss) arising during period Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Less: reclassification adjustment for net gain included in net income Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Income tax (expense) benefit related to items of other comprehensive income Other Comprehensive Income (Loss), Tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Leases [Abstract] Schedule of Operating Lease Assets and Lease Liabilities Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Schedule of Operating Lease Costs Lease, Cost [Table Text Block] Maturity Schedule of Operating Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Receivables [Abstract] Nonaccrual loans and leases Financing Receivable, Recorded Investment, Nonaccrual Status Loans and leases 90 days or more past due and still accruing Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Total nonperforming loans and leases Non Performing Loans Non-performing loans. Other real estate owned (“OREO”) Other Real Estate, Foreclosed Assets, and Repossessed Assets Total nonperforming assets Loans And Leases Receivable Non Performing Assets Loans and leases receivable non performing assets. Banking and Thrift [Abstract] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Hanmi Bank Subsidiaries [Member] Hanmi Financial Parent Company [Member] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Capital conservation buffer (percent) Capital Conservation Buffer, Actual, Percent Capital Conservation Buffer, Actual, Percent Actual Capital, Total capital to risk-weighted assets Capital Actual Capital, Tier 1 capital to risk-weighted assets Tier One Risk Based Capital Actual Capital, Common equity Tier 1 capital to risk-weighted assets Tier One Common Equity Tier One Common Equity Actual Capital, Tier 1 capital to average assets Tier One Leverage Capital Actual Capital Ratio, Total capital to risk-weighted assets Capital to Risk Weighted Assets Actual Capital Ratio, Tier 1 capital to risk-weighted assets Tier One Risk Based Capital to Risk Weighted Assets Actual Capital Ratio, Common equity Tier 1 capital to risk-weighted assets Tier One Common Capital to Risk Weighted Assets Tier One Common Capital to Risk Weighted Assets Actual Capital Ratio, Tier 1 capital to average assets Tier One Leverage Capital to Average Assets Minimum Regulatory Requirement Capital, Total capital to risk-weighted assets Capital Required for Capital Adequacy Minimum Regulatory Requirement Capital, Tier 1 capital to risk-weighted assets Tier One Risk Based Capital Required for Capital Adequacy Minimum Regulatory Requirement Capital, Common equity Tier 1 capital to risk-weighted assets Tier One Common Equity Required For Capital Adequacy Tier One Common Equity Required For Capital Adequacy Minimum Regulatory Requirement Capital, Tier 1 capital to average assets Tier One Leverage Capital Required for Capital Adequacy Minimum Regulatory Requirement Ratio for Total capital to risk-weighted assets Capital Required for Capital Adequacy to Risk Weighted Assets Minimum Regulatory Requirement Ratio for Tier 1 capital to risk-weighted assets Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Minimum Regulatory Requirement Ratio for Common equity Tier 1 capital to risk-weighted assets Tier One Common Capital Required for Capital Adequacy to Risk Weighted Assets Tier One Common Capital Required for Capital Adequacy to Risk Weighted Assets Minimum Regulatory Requirement Ratio for Tier 1 capital to average assets Tier One Leverage Capital Required for Capital Adequacy to Average Assets Minimum to Be Categorized as Well Capitalized Capital, Total capital to risk-weighted assets Capital Required to be Well Capitalized Minimum to Be Categorized as Well Capitalized Capital, Tier 1 capital to risk-weighted assets Tier One Risk Based Capital Required to be Well Capitalized Minimum to Be Categorized as Well Capitalized Capital, Common equity Tier 1 capital to risk-weighted assets Tier One Common Capital Required to be Well Capitalized Tier One Common Capital Required to be Well Capitalized Minimum to Be Categorized as Well Capitalized Capital, Tier 1 capital to average assets Tier One Leverage Capital Required to be Well Capitalized Minimum to Be Categorized as Well Capitalized Ratio, Total capital to risk-weighted assets Capital Required to be Well Capitalized to Risk Weighted Assets Minimum to Be Categorized as Well Capitalized Ratio, Tier 1 capital to risk-weighted assets Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Minimum to Be Categorized as Well Capitalized Ratio, Common equity Tier 1 capital to risk-weighted assets Tier One Common Capital Required to be Well Capitalized to Risk Weighted Assets Tier One Common Capital Required to be Well Capitalized to Risk Weighted Assets Minimum to Be Categorized as Well Capitalized Ratio, Tier 1 capital to average assets Tier One Leverage Capital Required to be Well Capitalized to Average Assets Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Significant Observable Inputs with No Active Market with Identical Characteristics Fair Value, Inputs, Level 2 [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Non-recurring Basis Fair Value, Measurements, Nonrecurring [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Unpaid principal balance of Non-accrual Non-PCI loans reviewed individually for amount of impairment Impaired Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment Impaired Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment Unpaid principal balance of Non-accrual Non-PCI loans reviewed collectively for amount of impairment Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment Statement of Financial Position [Abstract] Amortized cost of securities available for sale Debt Securities, Available-for-sale, Amortized Cost Allowance for loan losses of loans receivable Loans and Leases Receivable, Allowance Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Common stock authorized (shares) Common Stock, Shares Authorized Common stock issued (shares) Common Stock, Shares, Issued Common stock outstanding (shares) Common Stock, Shares, Outstanding Accumulated other comprehensive loss, tax expense/(benefit) Accumulated Other Comprehensive Income Loss Tax Unrealized gain on securities available for sale and interest only strips, net of income tax. Treasury stock (shares) Treasury Stock, Shares Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Credit Loss Status [Axis] Credit Loss Status [Axis] Credit Loss Status [Domain] Credit Loss Status [Domain] Non-PCI Loans and Leases Non Purchased Credit Impaired Loans [Member] Non Purchased Credit Impaired Loans [Member] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Real Estate Real Estate Portfolio Segment [Member] Real Estate Portfolio Segment [Member] Commercial and Industrial Commercial And Industrial Portfolio Segment [Member] Commercial And Industrial Portfolio Segment [Member] Leases Receivable Finance Leases Portfolio Segment [Member] Consumer Consumer Portfolio Segment [Member] Unallocated Unallocated Financing Receivables [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Allowance for loan losses: Allowance for Loan and Lease Losses [Roll Forward] Balance at beginning of period Loans and leases charged off Allowance for Loan and Lease Losses, Write-offs Recoveries on loans and leases previously charged off Allowance for Loan and Lease Loss, Recovery of Bad Debts Loan and lease loss provision Provision (Negative Provision) For Loan, Lease, And Other Losses Provision (Negative Provision) For Loan, Lease, And Other Losses Balance at end of period Ending balance: individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Ending balance: collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Loans receivable: Loans Receivable [Abstract] Loans receivable. Total Loans and leases receivable Loans and Leases Receivable, Gross Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Real estate loans Real Estate Loan [Member] Commercial and industrial loans Commercial And Industrial Loans [Member] Commercial and industrial loans. Consumer loans Consumer Loan [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 property loans [Member] Commercial Property Real Estate Loans [Member] Commercial Property Real Estate Loans [Member] Retail Commercial Real Estate Retail [Member] Commercial real estate Retail. Hospitality Hotel and Motel [Member] Hotel and Motel [Member] Other Commercial Real Estate Other [Member] Commercial real estate other. Residential property Residential Property Real Estate Loan [Member] Residential property real estate loan. Commercial lines of credit Commercial Lines Of Credit [Member] Commercial lines of credit. Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Total non-accrual Non-PCI loans and leases Quoted Prices in Active Markets for Identical Assets Fair Value, Inputs, Level 1 [Member] Significant Unobservable Inputs Fair Value, Inputs, Level 3 [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Impaired loans Impaired Loans [Member] Impaired loans. Real estate loans Real Estate Loans [Member] Real estate loans. Impaired loans Impaired Loans Fair Value Disclosure Impaired Loans fair value disclosure. Other real estate owned Other Real Estate Owned Fair Value Disclosure Other Real Estate Owned Fair Value Disclosure. Unrealized losses impaired loans Unrealized Gain (Loss) On Impaired Loans Held For Sale Unrealized Gain (Loss) On Impaired Loans Held For Sale Unrealized losses other real estate owned Unrealized Gains Losses On Other Real Estate Owned Unrealized Gains Losses On Other Real Estate Owned Transfers and Servicing [Abstract] Servicing Assets and Liabilities Transfers and Servicing of Financial Assets [Text Block] Investments, Debt and Equity Securities [Abstract] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2016-01 Accounting Standards Update 2016-01 [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Impairment charges on securities in continuous unrealized loss position for 12 months or longer Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale Net gain (loss) in earnings resulting from sale of securities Equity Securities, FV-NI, Realized Gain (Loss) Net unrealized gains (losses) recorded in comprehensive income Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax Reduction in securities available for sale Debt Securities, Available-for-sale Reduction to retained earnings Retained Earnings (Accumulated Deficit) Increase in net deferred tax asset Deferred Tax Assets, Net of Valuation Allowance Gross realized losses included in earnings Equity Securities, FV-NI, Realized Loss Available for sale securities pledged as collateral Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment Loans Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Loans Receivable to Loans Held for Sale Purchases Sales And Reclassification Of Loans Receivable To Loans Held For Sale By Portfolio Segment Table [Table Text Block] Purchases, sales and reclassification of loans receivable to loans held for sale by portfolio segment. Allowance for Non-PCI Losses and Allowance for Off-Balance Sheet Items Allowance For Loan Losses And Allowance For Off Balance Sheet Items [Table Text Block] Allowance For Loan Losses And Allowance For Off Balance Sheet Items [Table Text Block] Allowance for Loan Losses by Portfolio Segment Allowance for Credit Losses on Financing Receivables [Table Text Block] Credit Quality of Loan Portfolio Financing Receivable Credit Quality Indicators [Table Text Block] Analysis of Past Due Loans, Disaggregated by Loan Class Past Due Financing Receivables [Table Text Block] Information on Impaired Loans, Disaggregated by Loan Class Impaired Financing Receivables [Table Text Block] Summary of Interest Foregone on Impaired Loans Summary Of Interest Foregone On Impaired Loans Table [Table Text Block] Summary of interest foregone on impaired loans. Non-Accrual Loans, Disaggregated by Loan Class Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Non-Performing Assets Schedule Of Non Performing Assets Table [Table Text Block] Schedule of non performing assets. Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type Troubled Debt Restructurings On Financing Receivables Type Of Concession And Loans Table [Table Text Block] Tabular disclosure of total recorded investment of troubled debt restructurings by disaggregated types of concessions made and loan type. Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted stock awards Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, 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] Number of Shares, Restricted stock at beginning of period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Number of Shares, Restricted stock granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Number of Shares, Restricted stock vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Number of Shares, Restricted stock forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Number of Shares, Restricted stock at end of period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted-Average Grant Date Fair Value Per Share, Restricted stock at beginning of period (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value Per Share, Restricted stock granted (in usd 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 Weighted-Average Grant Date Fair Value Per Share, Restricted stock vested (in usd 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 Weighted-Average Grant Date Fair Value Per Share, Restricted stock forfeited (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value Per Share, Restricted stock at end of period (in usd per share) Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward] Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward] Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward] Balance at beginning of period Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Originations Payments for Origination of Mortgage Loans Held-for-sale Sales Proceeds from Sale of Loans Held-for-sale Principal payoffs and amortization Principal Payoffs And Amortization Principal payoffs and amortization. Balance at end of period Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock option awards Employee Stock Option [Member] Unvested restricted stock Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of diluted EPS (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Changes in Servicing Assets Schedule of Servicing Assets at Fair Value [Table Text Block] Change in Servicing Liabilities Schedule of Servicing Liabilities at Fair Value [Table Text Block] Risks and Uncertainties [Abstract] Off-Balance Sheet Commitments Concentration Risk Disclosure [Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Central Bancorp, Inc Central Bancorp Inc [Member] Central Bancorp Inc. [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Subordinated Debentures Subordinated Debt [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] 3-month London Interbank Offered Rate (LIBOR) Three-Month London Interbank Offered Rate (LIBOR) [Member] Three-Month London Interbank Offered Rate (LIBOR) [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Borrowings Advances from Federal Home Loan Banks Interest on borrowings Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Short-term Weighted-average interest rate Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year Loans pledged as collateral Loans Receivable, Net Borrowing capacity Borrowing Capacity Based On Pledged Collateral Borrowing capacity based on pledged collateral. Available borrowing capacity Borrowing Capacity Available Based On Pledged Collateral Borrowing capacity available based on pledged collateral. Loans pledged with FRB Carrying Value For Loans Pledged By Bank Carrying value for loans pledged by bank. Borrowing capacity through Fed Discount Window Amount Available From Borrowing Source Amount available from borrowing source. Outstanding borrowings Borrowing Borrowing. Subordinated debentures issued Debt Instrument, Face Amount Fixed interest rate Debt Instrument, Interest Rate, Stated Percentage Basis spread Debt Instrument, Basis Spread on Variable Rate Debt issue cost Debt Issuance Costs, Gross Debt outstanding, net of issuance cost Long-term Debt Amortization of debt issue costs Amortization of Debt Issuance Costs Unpaid principal balance Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Unpaid Principal Balance Of Long Term Debt Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Unpaid Principal Balance Of Long Term Debt Estimated fair value Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Debt instrument discount Debt Instrument, Unamortized Discount Term for the initial fixed interest rate Debt Instrument, Initial Fixed Interest Rate, Term Debt Instrument, Initial Fixed Interest Rate, Term Optional interest payment deferral period (not to exceed) Debt Instrument, Optional Interest Payment Deferral Period Debt Instrument, Optional Interest Payment Deferral Period Amortization of discount on debentures Amortization of Debt Discount (Premium) Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] ASU 2016-02 Accounting Standards Update 2016-02 [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Number of leases Lessee, Operating Lease, Number of Leases Lessee, Operating Lease, Number of Leases Initial lease terms Lessee, Operating Lease, Term of Contract Lease renewal term Lessee, Operating Lease, Renewal Term Right-of-use assets Operating Lease, Right-of-Use Asset Total lease liability Operating Lease, Liability Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate (percent) Operating Lease, Weighted Average Discount Rate, Percent Cash paid for amounts included in the measurement of Company's operating lease liabilities Operating Lease, Payments Net lease expense Operating Lease, Expense Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Pass/Pass-Watch Pass [Member] Special Mention Special Mention [Member] Classified Classified Grade [Member] Classified grade. Construction Commercial Real Estate Construction [Member] Commercial Real Estate Construction [Member] Commercial term Commercial Term Loans [Member] Commercial term loans. International loans International Loans [Member] International loans. Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Total gross loans and leases receivable Summary of Investment Securities Available for Sale Debt Securities, Available-for-sale [Table Text Block] Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Available for Sale Securities, Continuous Unrealized Loss Position, Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] Realized Gains and Losses on Sales of Investment Securities Realized Gain (Loss) on Investments [Table Text Block] Recurring Basis Fair Value, Measurements, Recurring [Member] U.S. Treasury securities US Treasury Securities [Member] Mortgage-backed securities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Collateralized mortgage obligations Collateralized Mortgage Obligations [Member] Debt securities US Government Agencies Debt Securities [Member] Total U.S. government agency and sponsored agency obligations US Government Agencies Debt Securities and US Government-sponsored Enterprises Debt Securities [Member] [Member] US Government Agencies Debt Securities and US Government-sponsored Enterprises Debt Securities [Member] [Member] Municipal bonds-tax exempt Nontaxable Municipal Bonds [Member] Securities available for sale Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Commitments to extend credit Commitments to Extend Credit [Member] Standby letters of credit Standby Letters of Credit [Member] Commercial letters of credit Commercial Letters Of Credit [Member] Commercial letters of credit. SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Allowance for off-balance sheet items SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Total undisbursed loan commitments Undisbursed Loan Commitments Undisbursed loan commitments. Allowance for Loan Off-Balance Sheet Items [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] (Income) provision Organization, Consolidation and Presentation of Financial Statements [Abstract] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Stock Repurchase Program Stock Repurchase Program [Member] Stock Repurchase Program [Member] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Number of shares authorized for repurchase, percentage of outstanding (percent) Stock Repurchase Program, Number of Shares Authorized to be Repurchased, Percent Stock Repurchase Program, Number of Shares Authorized to be Repurchased, Percent Number of shares authorized for repurchase (shares) Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock repurchased during period (shares) Treasury Stock, Shares, Acquired Stock repurchased during period Treasury Stock, Value, Acquired, Cost Method Income Statement [Abstract] Interest and dividend income: Interest and Dividend Income, Operating [Abstract] Interest and fees on loans and leases Interest and Fee Income, Loans and Leases Interest on securities Interest Income, Securities, Operating, Taxable Dividends on FHLB stock Dividends On Federal Reserve Bank And Federal Home Loan Bank Stock Dividends On Federal Reserve Bank And Federal Home Loan Bank Stock Interest on deposits in other banks Interest Income, Deposits with Financial Institutions Total interest and dividend income Interest and Dividend Income, Operating Interest expense: Interest Expense [Abstract] Interest on deposits Interest Expense, Deposits Interest on subordinated debentures Interest Expense, Subordinated Notes and Debentures Total interest expense Interest Expense Net interest income before provision for loan and lease losses Interest Income (Expense), Net Net interest income after provision for loan and lease losses Interest Income (Expense), after Provision for Loan Loss Noninterest income: Noninterest Income [Abstract] Service charges on deposit accounts Fees and Commissions, Depositor Accounts1 Fees and Commissions, Depositor Accounts1 Trade finance and other service charges and fees Remittance Fees Remittance fees. Gain on sales of Small Business Administration (“SBA”) loans Gain (Loss) on Sales of Loans, Net Net gain (loss) on sales of securities Debt and Equity Securities, Gain (Loss) Other operating income Noninterest Income, Other Operating Income Total noninterest income Noninterest Income Noninterest expense: Noninterest Expense [Abstract] Salaries and employee benefits Labor and Related Expense Occupancy and equipment Occupancy, Net Data processing Information Technology and Data Processing Professional fees Professional Fees Supplies and communications Supplies and Postage Expense Advertising and promotion Marketing and Advertising Expense Other operating expenses Other Noninterest Expense Total noninterest expense Noninterest Expense Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Basic earnings per share (in usd per share) Earnings Per Share, Basic Diluted earnings per share (in usd per share) Earnings Per Share, Diluted Weighted-average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (shares) Weighted Average Number of Shares Outstanding, Basic Diluted (shares) Weighted Average Number of Shares Outstanding, Diluted 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 liabilities due Lessee, Operating Lease, Liability, Payments, Due Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Present value of lease liability Equity [Abstract] Accumulated Other Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Amortized Cost Gross Unrealized Gain Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Loss Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Estimated Fair Value Servicing Asset [Abstract] Servicing Asset [Abstract] Servicing assets: Servicing Asset at Fair Value, Amount [Roll Forward] Balance at beginning of period Servicing Asset at Fair Value, Amount Addition related to sale of SBA loans Servicing Asset at Fair Value, Disposals Amortization Servicing Asset at Amortized Cost, Amortization Balance at end of period Servicing Liability [Abstract] Servicing Liability [Abstract] Servicing liabilities: Servicing Liability at Fair Value, Amount [Roll Forward] Balance at beginning of period Servicing Liability at Fair Value, Amount Amortization Servicing Liability at Amortized Cost, Amortization Balance at end of period Serviced loans sold to unaffiliated parties Serviced Loans Sold To Unaffiliated Parties Serviced loans sold to unaffiliated parties. Servicing fee income Contractually Specified Servicing Fees, Amount Net amortization expense Serivicing Assets And Servicing Liabilities, Net Amortization Expense Serivicing Assets And Servicing Liabilities, Net Amortization Expense Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of Shares, Options outstanding at beginning of period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Number of shares, Stock options exercised (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of Shares, Options outstanding at end of period (shares) Number of Shares, Options exercisable at end of period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted-Average Exercise Price Per Share, Options outstanding at beginning of period (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Options exercised (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Options outstanding at end of period (in usd per share) Weighted-Average Exercise Price Per Share, Options exercisable at end of period (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term [Abstract] Weighted-Average Remaining Contractual Life, Options outstanding at beginning of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted-Average Remaining Contractual Life, Options exercised Share Based Compensation Arrangement By Share Based Payment Award Options Exercise In Period Weighted Average Remaining Contractual Term Share Based Compensation Arrangement By Share Based Payment Award Options Exercise In Period Weighted Average Remaining Contractual Term Weighted-Average Remaining Contractual Life, Options outstanding at end of period Weighted-Average Remaining Contractual Life, Options exercisable at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value of In-the-Money Options, Options outstanding at beginning of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate Intrinsic Value of In-the-Money Options, Options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Aggregate Intrinsic Value of In-the-Money Options, Options outstanding at end of period Aggregate Intrinsic Value of In-the-Money Options, Options exercisable at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Intrinsic value represents the excess of the closing stock price related to options outstanding (in usd per share) Closing Price Of Common Stock The excess of the closing stock price on the last day of the trading period over the exercise price. Leases Lessee, Operating Leases [Text Block] Borrowings and Subordinated Debentures Debt Disclosure [Text Block] Allowance for loan and lease losses SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] Net (charge-offs) recoveries Allowance for Loan and Lease Losses Write-offs, Net Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Share-based compensation expense Allocated Share-based Compensation Expense Related tax benefits on non-qualified stock options Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Unrecognized share-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Number of shares, stock options exercised (shares) Earnings Per Share Earnings Per Share [Text Block] Capital Ratios of Hanmi Financial and Bank Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Recorded Investment Impaired Financing Receivable, Recorded Investment Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance With No Related Allowance Recorded Impaired Financing Receivable, with No Related Allowance, Recorded Investment With an Allowance Recorded Impaired Financing Receivable, with Related Allowance, Recorded Investment Related Allowance Impaired Financing Receivable, Related Allowance Average Recorded Investment Impaired Financing Receivable Average Recorded Value Of Investment Impaired Financing Receivable Average Recorded Value Of Investment Interest Income Recognized Impaired Financing Receivable Interest Income Recognized Impaired Financing Receivable Interest Income Recognized Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Non-Accrual TDRs, Deferral of Principal Non Accrual Tdrs Deferral Of Principal Non- accrual TDRs deferral of principal. Non-Accrual TDRs, Deferral of Principal and Interest Non Accrual Tdrs Deferral Of Principal And Interest Non- accrual TDRs deferral of principal and Interest. Non-Accrual TDRs, Reduction of Principal and Interest Non Accrual Tdrs Reduction Of Principal And Interest Non-accrual TDRs reduction of principal and interest. Non-Accrual TDRs, Extension of Maturity Non Accrual Tdrs Extension Of Maturity Non-accrual TDRs extension of maturity. Non-Accrual TDRs, Total Non Accrual Tdrs Non-accrual TDRs. Accrual TDRs, Deferral of Principal Accrual Tdrs Deferral Of Principal Accrual TDRs deferral of principal. Accrual Tdrs Deferral Of Principal and Interest Accrual Tdrs Deferral Of Principal And Interest Accrual TDRs deferral of principal and interest. Accrual TDRs, Reduction of Principal and Interest Accrual Tdrs Reduction Of Principal And Interest Accrual TDRs reduction of principal and interest. Accrual TDRs, Extension of Maturity Accrual Tdrs Extension Of Maturity Accrual TDRs extension of maturity. Accrual TDRs Accrual Tdrs Accrual TDRs. Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Gross realized gains on sales of securities Debt Securities, Available-for-sale, Realized Gain Gross realized losses on sales of securities Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment Net realized gains (losses) on sales of securities Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment Proceeds from sales of securities Proceeds from Sale and Maturity of Debt Securities, Available-for-sale Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] 30-59 Days Past Due Financing Receivables, 30 to 59 Days Past Due [Member] 60-89 Days Past Due Financing Receivables, 60 to 89 Days Past Due [Member] 90 Days or More Past Due Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Retail Commercial Real Estate Retails [Member] Commercial Real Estate Retails [Member] Other Commercial Real Estate Others [Member] Commercial Real Estate Others [Member] Past due loans and leases receivable Financing Receivable, Recorded Investment, Past Due Current Financing Receivable, Recorded Investment, Current Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Assets Assets [Abstract] Cash and due from banks Cash and Due from Banks Securities available for sale, at fair value (amortized cost of $624,112 as of March 31, 2019 and $583,444 as of December 31, 2018) Loans held for sale, at the lower of cost or fair value Loans and leases receivable, net of allowance for loan and lease losses of $32,896 as of March 31, 2019 and $31,974 as of December 31, 2018 Loans and Leases Receivable, Net Amount Accrued interest receivable Interest Receivable Premises and equipment, net Property, Plant and Equipment, Net Customers’ liability on acceptances Due from Customer Acceptances Servicing assets Goodwill and other intangible assets, net Finite-Lived Intangible Assets, Net Federal Home Loan Bank (“FHLB”) stock, at cost Federal Home Loan Bank Stock Bank-owned life insurance Bank Owned Life Insurance Prepaid expenses and other assets Prepaid Expense and Other Assets Total assets Assets Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Deposits: Deposits [Abstract] Noninterest-bearing Noninterest-bearing Deposit Liabilities Interest-bearing Interest-bearing Deposit Liabilities Total deposits Deposits Accrued interest payable Interest Payable Bank’s liability on acceptances Bank Acceptances Executed and Outstanding Subordinated debentures Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Accrued expenses and other liabilities Other Liabilities Total liabilities Liabilities Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.001 par value; authorized 62,500,000 shares; issued 33,153,888 shares (30,860,533 shares outstanding) as of March 31, 2019 and issued 33,202,369 shares (30,928,437 shares outstanding) as of December 31, 2018 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss, net of tax benefit of $760 as of March 31, 2019 and $2,457 as of December 31, 2018 Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Less: treasury stock, at cost; 2,293,355 shares as of March 31, 2019 and 2,273,932 shares as of December 31, 2018 Treasury Stock, Value Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Assets and Liabilities Measured at Fair Value on Non-Recurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Estimated Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Commercial property loan [Member] Commercial Property Loan [Member] Commercial property loan. Other Commercial Real Estate Other, Including Gas Stations [Member] Commercial Real Estate Other, Including Gas Stations [Member] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain] Home equity line of credit Home Equity Line of Credit [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Allowance for loan and lease losses Loans and leases receivable, net Operating lease cost Operating Lease, Cost Sublease income Sublease Income Net lease cost Lease, Cost Income Tax Disclosure [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] ASU 2018-02 Accounting Standards Update 2018-02 [Member] Accounting Standards Update 2018-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Provision (benefit) for income taxes for continuing operations Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Valuation allowance Deferred Tax Assets, Valuation Allowance Net deferred tax asset Net current tax asset Deferred Tax Assets, Net of Valuation Allowance, Current Impact on retained earnings of adopting recent accounting pronouncement Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. Provision expense Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Tax settlement paid to the Franchise Tax Board Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities Activity in Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [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 Amount Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Loans held for sale Loans Held-for-sale, Fair Value Disclosure Loans and leases receivable, net of allowance for loan and lease losses Loans Receivable, Fair Value Disclosure FHLB stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Financial liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Noninterest-bearing deposits Interest-bearing deposits Borrowings and subordinated debentures Debt Instrument, Fair Value Disclosure Off-balance sheet items: Off Balance Sheet Items [Abstract] Off-Balance sheet items. Commitments to extend credit Commitments, Fair Value Disclosure Letters of credit Lines of Credit, Fair Value Disclosure Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock - Number of Shares, Shares Issued Common Stock [Member] Common Stock - Number of Shares, Treasury Shares Treasury Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Retained Earnings Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance at beginning of period Beginning balance, shares issued (shares) Shares, Issued Beginning balance, treasury stock (shares) Beginning balance, shares outstanding (shares) Shares, Outstanding Adjustments related to adoption of new accounting standards: Cumulative Effect of New Accounting Principle in Period of Adoption Adjusted balance at January 1, 2018 Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance Stock options exercised Stock Issued During Period, Value, Stock Options Exercised Restricted stock awards, net of forfeitures (shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Restricted stock awards, net of forfeitures Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Stock options exercised (shares) Restricted stock awards, net of forfeitures Stock Issued During Period, Value, Restricted Stock Award, Gross Restricted stock awards, net of forfeitures (shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Share-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Restricted stock surrendered due to employee tax liability (shares) Shares Paid for Tax Withholding for Share Based Compensation Restricted stock surrendered due to employee tax liability Adjustments Related to Tax Withholding for Share-based Compensation Cash dividends declared Dividends, Common Stock, Cash Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Change in unrealized gain on securities available for sale, net of income taxes Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Balance at end of period Ending balance, shares issued (shares) Ending balance, treasury stock (shares) Ending balance, shares outstanding (shares) Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year focus Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Organization and Basis of Presentation Basis of Accounting [Text Block] Basis of Accounting Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Fair Value Assumptions of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Unrealized Gains and Losses on Available for Sale Securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Tax Benefit (Expense) Tax Expense Benefit [Member] Tax Expense Benefit [Member] Accumulated Other Comprehensive Income [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, net of tax Adjustment to Accumulated Other Comprehensive Income, Net of Tax Adjustment to Accumulated Other Comprehensive Income, Net of Tax Reduction of unrealized losses related to securities Adjustment to Accumulated Other Comprehensive Income, Before Tax Adjustment to Accumulated Other Comprehensive Income, Before Tax Reduction in tax benefits upon adoption of ASUs Adjustment to Accumulated Other Comprehensive Income, Tax Adjustment to Accumulated Other Comprehensive Income, Tax Unrecognized Share-Based Compensation Expense Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Summary of Stock Options Outstanding under Plans Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Schedule of Restricted Stock Awards Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Loans and lease receivables Loans and Finance Receivables [Member] Loans and leases receivable pledged to secure advances Loans Pledged as Collateral Commitments to lend additional funds to borrowers whose loans are impaired Loans and Leases Receivable, Impaired, Commitment to Lend TDR loans receivable Loans Held For Sale Excluded From Tdr Loans Receivable Loans held for sale excluded from TDR loans receivable. Principal and interest due Maximum Period For Interest To Be Due Maximum period for interest to be due. Reserves relating to loans included in allowance for loan losses Reserve Related To Tdr Loans Included In Allowance For Loan Losses Reserve related to TDR loans included in the allowance for loan losses. Basic EPS Earnings Per Share, Basic [Abstract] Less: Income allocated to unvested restricted shares Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Basic EPS Net Income (Loss) Available to Common Stockholders, Basic Weighted-average shares for basic EPS (shares) Effect of dilutive securities - options and unvested restricted stock (shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Diluted EPS Earnings Per Share, Diluted [Abstract] Net income Net Income (Loss) Available to Common Stockholders, Diluted Less: Income allocated to unvested restricted shares Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted Diluted EPS Undistributed Earnings (Loss) Available to Common Shareholders, Diluted Weighted-average shares for diluted EPS (shares) AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Balance at beginning of period AOCI before Tax, Attributable to Parent Other comprehensive income before reclassification, before tax OCI, before Reclassifications, before Tax, Attributable to Parent Reclassification from accumulated other comprehensive income, before tax Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, before tax Period change, before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Balance at end of period Balance at beginning of period, tax AOCI Tax, Attributable to Parent Other comprehensive (loss) income before reclassification, tax Other Comprehensive Income (Loss) before Reclassifications, Tax Reclassification from accumulated other comprehensive income, tax Reclassification from AOCI, Current Period, Tax Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, tax Period change, tax Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Balance at end of period, tax Other comprehensive income before reclassification, net of tax OCI, before Reclassifications, Net of Tax, Attributable to Parent Reclassification from accumulated other comprehensive income Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, net of tax Unrecognized Expense Average Expected Recognition Period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Distribution of Undisbursed Loan Commitments Other Commitments [Table Text Block] Allowance For Loan Losses And Allowance For Off Balance Sheet Items Income Taxes Income Tax Disclosure [Text Block] Revenue from Contract with Customer [Abstract] Revenue Recognition Revenue from Contract with Customer [Text Block] Interest income that would have been recognized had impaired loans performed in accordance with their original terms Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income Less: Interest income recognized on impaired loans Impaired Financing Receivable, Interest Income, Accrual Method Interest foregone on impaired loans Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans Statement of Cash Flows [Abstract] 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 and amortization Depreciation, Nonproduction Share-based compensation expense Share-based Compensation (Gain) loss on sales of securities Gain on sales of SBA loans Gain (Loss) on Sale of Loans and Leases Origination of SBA loans held for sale Payments for Origination and Purchases of Loans Held-for-sale Proceeds from sales of SBA loans Proceeds From Sale Of Small Business Administration Loans Proceeds From Sale Of Small Business Administration Loans Change in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Change in bank-owned life insurance Life Insurance, Corporate or Bank Owned, Change in Value Change in prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Change in accrued interest payable Increase (Decrease) in Interest Payable, Net Change in accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities 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] Proceeds from matured, called and repayment of securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Proceeds from sales of securities available for sale Proceeds from Sale of Debt Securities, Available-for-sale Change in loans and leases receivable, excluding purchases Proceeds from Sale of Loans and Leases Held-for-investment Change in loans and leases receivable, excluding purchases Payments to Acquire Loans and Leases Held-for-investment Purchases of securities available for sale Payments to Acquire Debt Securities, Available-for-sale Purchases of premises and equipment Payments to Acquire Productive Assets Purchases of loans and leases receivable Payments to Acquire Receivables 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] Change in deposits Increase (Decrease) in Deposits Change in borrowings Increase (Decrease) in Loans to Federal Home Loan Banks Proceeds from exercise of stock options Proceeds from Stock Options Exercised Cash paid for surrender of vested shares due to employee tax liability Payments Related to Tax Withholding for Share-based Compensation Cash dividends paid Payments of Dividends Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and cash equivalents at beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents at end of period Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid during the period for: Payments for Operating Activities [Abstract] Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Income taxes Income Taxes Paid, Net Non-cash activities: Other Noncash Investing and Financing Items [Abstract] Income tax (expense) benefit related to items in other comprehensive income Change in unrealized loss in accumulated other comprehensive income Other Comprehensive Income (Loss), before Tax Cash dividends declared Cash Dividend Declared Cash dividend declared but not yet paid during the period reported. Right-of-use asset obtained in exchange for lease liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Available-for-Sale Within one year, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Available-for-Sale Over one year through five years, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Available-for-Sale Over five years through ten years, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Available-for-Sale Over ten years, Amortized Cost Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost Available-for-Sale Within one year, Estimated Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Available-for-Sale Over one year through five years, Estimated Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Available-for-Sale Over five years through ten years, Estimated Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Available-for-Sale Over ten years, Estimated Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Estimated fair value Summary of Investment Holdings [Table] Summary of Investment Holdings [Table] Collateralized mortgage obligations Collateralized Mortgage Backed Securities [Member] Collateralized mortgage backed securities. Summary of Investment Holdings [Line Items] Summary of Investment Holdings [Line Items] Available-for-Sale Within One Year, Gross Unrealized Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Available-for-Sale Within One Year, Estimated Fair Value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Available-for-Sale Within One Year, Number of Securities Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Available-for-Sale More than One Year, Gross Unrealized Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-Sale More than One Year, Estimated Fair Value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Available-for-Sale More than One Year, Number of Securities Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Available-for-Sale, Gross Unrealized Loss Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Available-for-Sale, Estimated Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position Available-for-Sale, Number of Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Total right-of-use asset Loans and Leases Loans, Notes, Trade and Other Receivables Disclosure [Text Block]