Earnings Per Share [Abstract] Reconciliation of Components Used to Derive Basic and Diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Statement of Stockholders' Equity [Abstract] 1-for-8 stock split ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Statement of Comprehensive Income [Abstract] Net income Net Income (Loss) Attributable to Parent Other comprehensive (loss) income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized (loss) gain on securities Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract] Unrealized holding (loss) gain 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 Unrealized loss on interest-only strip of servicing assets Unrealized Gain Loss On Interest Only Strip Of Servicing Assets Unrealized Gain Loss On Interest Only Strip Of Servicing Assets Income tax benefit (expense) related to items of other comprehensive income Other Comprehensive Income (Loss), Tax Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent 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 Period 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 Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers 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 Entity Public Float Entity Public Float 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] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2013 Plan 2013 Equity Compensation Plan [Member] 2013 Equity Compensation Plan [Member] 2007 and 2013 Plan 2007 Equity Compensation Plan (the “2007 Plan”) and 2013 Equity Compensation Plan [Member] 2007 Equity Compensation Plan (the “2007 Plan”) and 2013 Equity Compensation Plan [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of incentive plans Number Of Equity Incentive Plans Number Of Equity Incentive Plans Number of shares of common stock to be granted under equity incentive awards Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized For Future Issuance Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized For Future Issuance Shares available for issuance under the Plan Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Issuance Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Issuance Period of continuous service Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Options granted in period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Stock options, expiration term from date of grant Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Closing price of common stock Closing Price Of Common Stock The excess of the closing stock price on the last day of the trading period over the exercise price. Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Income Tax Disclosure [Abstract] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized tax benefits at beginning of year Unrecognized Tax Benefits Gross increases for tax positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Lapse of statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Unrecognized tax benefits at end of year Investments, Debt and Equity Securities [Abstract] Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] Within one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Over one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Over five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Over ten years Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Estimated Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Within one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Over one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Over five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Over ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Total Debt Securities, Available-for-sale Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] 3-Month LIBOR Three-Month London Interbank Offered Rate (LIBOR) [Member] Three-Month London Interbank Offered Rate (LIBOR) [Member] 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] Debt Instrument [Line Items] Debt Instrument [Line Items] Subordinated debentures, unpaid principal amount Debt Instrument, Face Amount Debt instrument fixed rate (percent) Debt Instrument, Interest Rate, Stated Percentage Basis spread (percent) Debt Instrument, Basis Spread on Variable Rate Debt issuance costs Debt Issuance Costs, Gross Long-term debt Long-term Debt Amortization of debt issuance costs Amortization of Debt Issuance Costs Subordinated debentures Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Debt instrument discount Debt Instrument, Unamortized Discount Variable interest rate basis Debt Instrument, Description of Variable Rate Basis Frequency of interest payment Debt Instrument, Frequency of Periodic Payment Interest deferral period (up to) Debt Instrument, Optional Interest Payment Deferral Period Debt Instrument, Optional Interest Payment Deferral Period Amortization of subordinated debentures Amortization of Debt Discount (Premium) Federal Home Loan Banks [Abstract] FHLB advances Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months Total FHLB advances Advances from Federal Home Loan Banks Banking and Thrift [Abstract] Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Time Deposits of $250,000 or More [Member] Time Deposits, 250,000 or More [Member] Time Deposits, 250,000 or More [Member] Other Time Deposits [Member] Other Time Deposits [Member] Other Time Deposits [Member] Restricted Cash and Cash Equivalents Items [Line Items] Restricted Cash and Cash Equivalents Items [Line Items] 2019 Time Deposit Maturities, Next Twelve Months 2020 Time Deposit Maturities, Year Two 2021 Time Deposit Maturities, Year Three 2022 Time Deposit Maturities, Year Four 2023 Time Deposit Maturities, Year Five Total Time Deposits Accounting Policies [Abstract] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2016-02 Accounting Standards Update 2016-02 [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Expected Scenario, Forecast [Member] 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] 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] Equipment Financing Receivable Financing Receivable [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Hanmi Bank Subsidiaries [Member] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Full Service Full Service [Member] Full Service [Member] Loan Production Loan Production [Member] Loan Production [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Number of reportable segments Number of Reportable Segments Proceeds from redemption of FRB stock Proceeds from Sale of Federal Reserve Bank Stock Number of branches Number Of Branches Number Of Branches Intangible asset amortization period Finite-Lived Intangible Asset, Useful Life Estimated loss emergence period Estimated Loss Emergence Period Estimated Loss Emergence Period Number of shares authorized for repurchase (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 under program (shares) Stock Repurchase Program, Number of Shares Authorized to be Repurchased Shares repurchased (shares) Treasury Stock, Shares, Acquired Shares repurchased Treasury Stock, Value, Acquired, Cost Method Right-of-use asset (less than) Operating Lease, Right-of-Use Asset Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Buildings and improvements Building and Building Improvements [Member] Furniture and equipment Furniture And Equipment [Member] Furniture And Equipment [Member] Leasehold improvements Leasehold Improvements [Member] Software Computer Software, Intangible Asset [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Premises and equipment useful life Property, Plant and Equipment, Useful Life Premises and equipment useful life Property, Plant and Equipment, Estimated Useful Lives Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] CBI Merger CBI Merger [Member] CBI Merger [Member] Core deposit intangible Core Deposits [Member] Third-party originators intangible Third Party Originators Intangible [Member] Third Party Originators Intangible [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Intangible assets acquired Finite-lived Intangible Assets Acquired Goodwill Goodwill, Acquired During Period Total amortization expense for other intangible assets, including discontinued operations Amortization of Intangible Assets Goodwill impairment Goodwill, Impaired, Accumulated Impairment Loss Intangible asset impairment charges Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 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 (losses) gains on sales of securities Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment Proceeds from sales of investment securities Proceeds from Sale and Maturity of Debt Securities, Available-for-sale Summary of Investment Holdings [Table] Summary of Investment Holdings [Table] Mortgage-backed securities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Collateralized mortgage obligations Collateralized Mortgage Backed Securities [Member] Collateralized mortgage backed securities. U.S. government agency securities US Government Agencies Debt Securities [Member] Municipal bonds-tax exempt Nontaxable Municipal Bonds [Member] U.S. treasury securities US Treasury Securities [Member] Mutual funds Mutual Fund [Member] Summary of Investment Holdings [Line Items] Summary of Investment Holdings [Line Items] Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Estimated Fair Value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Gross Unrealized Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Estimated Fair Value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Debt Securities, Available-for-sale, Unrealized Loss Position, Gross Unrealized Loss Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Gross carrying amount, excluding goodwill Finite-Lived Intangible Assets, Gross Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Net carrying amount, excluding goodwill Indefinite-lived Intangible Assets (Excluding Goodwill) Goodwill Goodwill Gross carrying amount Intangible Assets, Gross, Including Goodwill Intangible Assets, Gross, Including Goodwill Net carrying amount Intangible Assets, Net (Including Goodwill) Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Deferred tax assets: Deferred Tax Assets, Net [Abstract] Allowance for loan and lease losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Depreciation Deferred Tax Assets, Property, Plant and Equipment Purchase accounting Deferred Tax Assets, Purchase Accounting Deferred Tax Assets, Purchase Accounting Net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards Unrealized loss on securities available for sale Deferred Tax Assets Investments Tax Credits Deferred Tax Assets Investments Tax Credits Indemnified assets Deferred Tax Assets, Indemnified Assets Deferred Tax Assets, Indemnified Assets Tax credit Deferred Tax Assets, Tax Credit Carryforwards State taxes Deferred Tax Assets, State Taxes Other Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Gross Deferred tax liabilities: Deferred Tax Liabilities, Net [Abstract] Mark to market Deferred Tax Liabilities Mark To Market On Loans Deferred Tax Liabilities Mark To Market On Loans Depreciation Deferred Tax Liabilities Purchase Accounting Deferred Tax Liabilities Purchase Accounting Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Valuation Allowance Deferred Tax Assets, Valuation Allowance Net deferred tax assets Deferred Tax Assets, Net Borrowings Federal Home Loan Bank Advances, Disclosure [Text Block] Property, Plant and Equipment [Abstract] Land Land [Member] Furniture and equipment Furniture and Fixtures [Member] Leased equipment Equipment Leased to Other Party [Member] Premises and equipment, gross Property, Plant and Equipment, Gross Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total premises and equipment, net Property, Plant and Equipment, Net Depreciation and amortization expense Depreciation, Depletion and Amortization Receivables [Abstract] Interest income that would have been recognized had impaired loans performed in accordance with their original terms Loans And Leases Receivable Impaired Interest Income Not Recognized Loans and leases receivable impaired interest income not recognized. 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 Income Forgone Loans and leases receivable impaired interest income forgone. 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] Net income Less: income allocated to unvested restricted shares Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Income from continuing operations, net of taxes Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net Income (Loss) Available to Common Stockholders, Basic Net Income (Loss) Available to Common Stockholders, Basic Income allocated to common shares Net Income (Loss) Available to Common Stockholders, Diluted Weighted-average shares for basic EPS (shares) Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities - options, warrants and unvested restricted stock (shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted-average shares for diluted EPS Weighted Average Number of Shares Outstanding, Diluted Net income per share, basic (in usd per share) Earnings Per Share, Basic, Undistributed Net income per share, diluted (in usd per share) Earnings Per Share, Diluted, Undistributed Income from continuing operations, net of taxes (in usd per share) Income (Loss) from Continuing Operations, Per Basic Share Effect of dilutive securities (in USD per share) Effect Of Dilutive Securities Per Share Effect of dilutive securities per share. Loss from discontinued operations, net of taxes (in usd per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share Basic earnings per share (in usd per share) Earnings Per Share, Basic Income from continuing operations, net of taxes (in usd per share) Income (Loss) from Continuing Operations, Per Diluted Share Net loss from discontinued operation per diluted share (in usd per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Diluted earnings per share (in usd per share) Earnings Per Share, Diluted Statement [Table] Statement [Table] ASU 2016-01 Accounting Standards Update 2016-01 [Member] ASU 2018-02 Accounting Standards Update 2018-02 [Member] Accounting Standards Update 2018-02 [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Accumulated (Deficit) Retained Earnings Retained Earnings [Member] Treasury Stock, at Cost Treasury Stock [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance Stockholders' Equity Attributable to Parent Beginning balance issued (shares) Shares, Issued Beginning balance treasury stock (shares) Treasury Stock, Shares Beginning balance outstanding (shares) Shares, Outstanding Adjusted balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance Adjustments related to correction of accounting and adoption of new accounting standards: Cumulative Effect of New Accounting Principle in Period of Adoption Stock options exercised Stock Issued During Period, Value, Stock Options Exercised Stock options exercised (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Restricted stock awards, net of forfeitures Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Restricted stock awards, net of forfeitures (shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 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 Adjustments Related to Tax Withholding for Share-based Compensation Repurchase of common stock Stock Repurchased During Period, Value Repurchase of common stock (shares) Stock Repurchased During Period, Shares Restricted stock surrendered due to employee tax liability Shares Paid for 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 (loss) on securities available for sale, net of income taxes Ending balance Ending balance issued (shares) Ending balance treasury stock (shares) Ending balance outstanding (shares) Transfers and Servicing [Abstract] Servicing Asset at Amortized Cost, Balance [Roll Forward] Servicing Asset at Amortized Cost, Balance [Roll Forward] Balance at beginning of period Servicing Asset at Amortized Cost Addition related to sale of SBA loans Servicing Asset at Amortized Cost, Additions Amortization Servicing Asset at Amortized Cost, Amortization Reversal of allowance Servicing Asset at Amortized Cost, Increase (Decrease) for Valuation Allowance Adjustment Balance at end of period Balance at beginning of period Servicing Liability at Amortized Cost, Balance Amortization Servicing Liability at Amortized Cost, Amortization Reversal of allowance Servicing Liability at Amortized Cost, Other Increase (Decrease) in Obligation 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 Bank Service Fee, Amortization Bank Service Fee, Amortization 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 [Member] Employee Stock Option [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Anti-dilutive shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Share-Based Compensation Expense and Related Tax Benefits Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Unrecognized Share-Based Compensation Expense Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Summary of Information under Plans Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] Summary of Stock Option Transactions under Plans Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of Transactions for Non-Vested Stock Options Schedule of Nonvested Share Activity [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 under 2013 Plan Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Nonaccrual Non-PCI loans Financing Receivable, Recorded Investment, Nonaccrual Status Loans 90 days or more past due and still accruing Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Total nonperforming Non-PCI loans Non Performing Loans Non-performing loans. Other real estate owned 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. Fair Value Disclosures [Abstract] 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 Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [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] 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. Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] 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 loan losses [Member] SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Allowance for loan losses on loans and leases: 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 on loans and leases previously charged off Allowance for Loan and Lease Loss, Recovery of Bad Debts Net loan and lease charge-offs Allowance for Loan and Lease Losses Write-offs, Net Loan and lease loss provision (income) Provision (Negative Provision) For Loan, Lease, And Other Losses Provision (Negative Provision) For Loan, Lease, And Other Losses Balance at end of period Quarterly Financial Information Disclosure [Abstract] Summary of Quarterly Financial Data Quarterly Financial Information [Table Text Block] Statement of Financial Position [Abstract] Amortized cost of securities available-for-sale Allowance for loan losses of loans receivable Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share 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 Tax 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 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Number of Shares, Non-vested options outstanding at beginning of period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Number of Shares, Options vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Number of Shares, Options forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Number of Shares, Non-vested options outstanding at end of period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted-Average Exercise Price Per Share, Non-vested options outstanding at beginning of period (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Options vested (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Weighted-Average Exercise Price Per Share, Options forfeited (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value Weighted-Average Exercise Price Per Share, Non-vested options outstanding at end of period (in usd per share) Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] 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. Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Non-recurring Basis Fair Value, Measurements, Nonrecurring [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 Impaired loans Impaired Loans Fair Value Disclosure Impaired Loans fair value disclosure. Assets Assets [Abstract] Cash and due from banks Cash and Due from Banks Securities available for sale, at fair value (amortized cost of $583,444 as of December 31, 2018 and $581,992 as of December 31, 2017) Loans held for sale, at the lower of cost or fair value Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Loans and leases receivable, net of allowance for loan and lease losses of $31,974 as of December 31, 2018 and $31,043 as of December 31, 2017 Loans and Leases Receivable, Net Amount Accrued interest receivable Interest Receivable Premises and equipment, net Customers’ liability on acceptances Due from Customer Acceptances Servicing assets Servicing Asset at Fair Value, Amount Goodwill and other intangibles, net Finite-Lived Intangible Assets, Net Federal Home Loan Bank stock (“FHLB”), at cost Federal Home Loan Bank Stock Deferred tax assets Deferred Income Tax Assets, Net Current tax assets Income Taxes Receivable 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 Borrowings 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 33,202,369 shares (30,928,437 shares outstanding) as of December 31, 2018 and issued 33,083,133 shares (32,431,627 shares outstanding) as of December 31, 2017 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss, net of tax benefit of $2,457 as of December 31, 2018 and $1,319 as of December 31, 2017 Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Less: treasury stock, at cost; 2,273,932 shares as of December 31, 2018 and 651,506 shares as of December 31, 2017 Treasury Stock, Value Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Interest and dividend income Interest and Dividend Income, Operating Interest expense Interest Expense Net interest income before provision for loan and lease losses Interest Income (Expense), Net Loan and lease loss provision (income) Noninterest income Noninterest Income Noninterest expense Noninterest Expense Income before income tax expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Basic earnings per share: Earnings Per Share, Basic [Abstract] Diluted earnings per share: Earnings Per Share, Diluted [Abstract] Schedule of changes in Servicing Assets Servicing Asset at Amortized Cost [Table Text Block] Schedule of changes in Servicing Liabilities Servicing Liability at Amortized Cost [Table Text Block] Demand – interest-bearing Interest Expense, Savings Deposits Money market and savings Interest Expense, NOW Accounts, Money Market Accounts, and Savings Deposits Time deposits of $100,000 or more Interest Expense, Time Deposits, $100,000 or More Other time deposits Interest Expense, Other Domestic Deposits Total interest expense on deposits Interest Expense, Deposits Weighted-average interest rate at end of year Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate at Period End Weighted-average interest rate during the year Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year Average balance of FHLB advances Federal Home Loan Bank, Advances, Activity for Year, Average Balance of Agreements Outstanding Maximum amount outstanding at any month-end Federal Home Loan Bank, Advances, Activity for Year, Maximum Outstanding at any Month End Credit Loss Status [Axis] Credit Loss Status [Axis] Credit Loss Status [Domain] Credit Loss Status [Domain] Non-PCI Loans Non Purchased Credit Impaired Loans [Member] Non Purchased Credit Impaired Loans [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] 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] Leases receivable Finance Leases Portfolio Segment [Member] Class of Financing Receivable [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable, Type [Domain] Total commercial property loans Commercial Property Real Estate Loans [Member] Commercial Property Real Estate Loans [Member] Retail Commercial Real Estate Retails [Member] Commercial Real Estate Retails [Member] Hospitality Hotel and Motel [Member] Hotel and Motel [Member] Other Commercial Real Estate Others [Member] Commercial Real Estate Others [Member] Construction Commercial Real Estate Construction [Member] Commercial Real Estate Construction [Member] Residential property Residential Property Real Estate Loan [Member] Residential property real estate loan. Commercial term Commercial Term Loans [Member] Commercial term loans. Commercial lines of credit Commercial Lines Of Credit [Member] Commercial lines of credit. International loans International Loans [Member] International loans. Past due loans and leases receivable Financing Receivable, Recorded Investment, Past Due Current Financing Receivable, Recorded Investment, Current Total loans and Leases Loans and Leases Receivable, Gross Subordinated Debentures Debt Disclosure [Text Block] Accrued interest payable on deposits Deposit Liabilities, Accrued Interest Total deposits reclassified to loans due to overdrafts Deposit Liabilities Reclassified as Loans Receivable Income Taxes Income Tax Disclosure [Text Block] Condensed Financial Information Disclosure [Abstract] Condensed Income Statement [Table] Condensed Income Statement [Table] Hanmi Financial Parent Company [Member] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Dividends from bank subsidiary Income (Loss) from Equity Method Investments Interest expense Other expense Other Noninterest Expense Income before taxes and undistributed income Income (Loss) Attributable to Parent, before Tax Income tax benefit Income before undistributed income of subsidiary Net Income (Loss) Attributable to Parent, Before Equity In Undistributed Income of Subsidiary Net Income (Loss) Attributable to Parent, Before Equity In Undistributed Income of Subsidiary Equity in undistributed earnings of subsidiary Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] 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] Unrealized Gains and Losses on Interest-Only Strip Interest-Only-Strip [Member] Accumulated Other Comprehensive Income [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Balance at beginning of period, before tax AOCI before Tax, Attributable to Parent Other comprehensive loss before reclassification, before tax OCI, before Reclassifications, before Tax, Attributable to Parent Reclassification from accumulated other comprehensive loss, before tax Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Adjustments to accumulated other comprehensive income, before tax Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax Period change, before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Balance at end of period, before tax Balance at beginning of period, tax AOCI Tax, Attributable to Parent Other comprehensive loss before reclassification, tax Other Comprehensive Income (Loss) before Reclassifications, Tax Reclassification from accumulated other comprehensive loss, tax Reclassification from AOCI, Current Period, Tax Adjustments to accumulated other comprehensive income, tax Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax Period change, tax Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Balance at end of period, tax Other comprehensive loss before reclassification OCI, before Reclassifications, Net of Tax, Attributable to Parent Reclassification from accumulated other comprehensive loss Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Adjustments to accumulated other comprehensive income Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Goodwill and Other Intangibles Intangible Assets Disclosure [Text Block] Useful Lives for Principal Classes of Assets Schedule of Property and Equipment Useful Lives [Table Text Block] Schedule of Property and Equipment Useful Lives [Table Text Block] Postemployment Benefits [Abstract] Employee Benefits Compensation and Employee Benefit Plans [Text Block] Risks and Uncertainties [Abstract] Off-Balance Sheet Commitments Concentration Risk Disclosure [Text Block] Recurring Basis [Member] Fair Value, Measurements, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Quoted Prices in Active Markets for Identical Assets Fair Value, Inputs, Level 1 [Member] Significant Observable Inputs with No Active Market with Identical Characteristics Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs Fair Value, Inputs, Level 3 [Member] Mortgage-backed securities Residential Mortgage Backed Securities [Member] Collateralized mortgage obligations Collateralized Mortgage Obligations [Member] Estimated Fair Value 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 Reclassification out of Accumulated Other Comprehensive Income [Member] Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Adjustments to accumulated other comprehensive income, tax Net (loss) gain on sales of securities Debt and Equity Securities, Gain (Loss) Net unrealized gains (losses) recognized in earnings resulting from the redemption of investment securities Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax Share-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Year of Maturity, 2019, Amount Year of Maturity, 2019, Weighted-Average Interest Rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due within One Year of Balance Sheet Date Year of Maturity, Total, Weighted-Average Interest Rate Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate Defined Contribution Plan [Table] Defined Contribution Plan [Table] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Retirement Plan Name [Domain] Retirement Plan Name [Domain] Section 401(k) Plan Section 401(k) Plan [Member] Section 401(k) Plan [Member] Bank-Owned Life Insurance Bank Owned Life Insurance [Member] Bank Owned Life Insurance [Member] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Percent of participant contributions (percent) Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Percent of employer contribution (up to, percent) Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Contributions Defined Contribution Plan, Cost Cash surrender value Cash Surrender Value of Life Insurance 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 Federal Reserve Bank (FRB) and 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 expense: Interest Expense [Abstract] Interest on deposits Interest on borrowings Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Short-term Interest on subordinated debentures Interest Expense, Subordinated Notes and Debentures Total interest expense 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 Other operating income Noninterest Income, Other Operating Income Total 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 Merger and integration costs (income) Business Combination, Integration Related Costs Other operating expenses Total noninterest expense Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense Weighted-average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (shares) Diluted (shares) Summary of Major Components of Premises and Equipment Property, Plant and Equipment [Table Text Block] Summary of Operations Nature Of Operations And Principles Of Consolidation Policy [Policy Text Block] Nature Of Operations And Principles Of Consolidation Policy [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates in the Preparation of Financial Statements Use of Estimates, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Securities Marketable Securities, Policy [Policy Text Block] Loans and Leases Receivable Finance, Loans and Leases Receivable, Policy [Policy Text Block] Loans Held for Sale Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] Allowance for Loan and Lease Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Impaired Loans Impaired Financing Receivable, Policy [Policy Text Block] Troubled Debt Restructuring Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block] Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Other Real Estate Owned Loans and Leases Receivable, Real Estate Acquired Through Foreclosure, Policy [Policy Text Block] Servicing Assets and Servicing liabilities Transfers and Servicing of Financial Assets, Policy [Policy Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Federal Home Loan Bank Stock Federal Home Loan Bank Stock [Policy Text Block] Federal Home Loan Bank Stock [Policy Text Block] Federal Reserve Bank Stock Federal Reserve Bank Stock Policy [Policy Text Block] Disclosure of accounting policy for life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. Bank-Owned Life Insurance Bank Owned Life Insurance Policy [Policy Text Block] Disclosure of accounting policy for life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. Income Tax Income Tax, Policy [Policy Text Block] Affordable Housing Investments Equity Method Investments [Policy Text Block] Share-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Earnings per Share Earnings Per Share, Policy [Policy Text Block] Treasury Stock Stockholders' Equity, Policy [Policy Text Block] Business Combinations Business Combinations Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Balance Sheets of Parent Company Condensed Balance Sheet [Table Text Block] Statement of Income of Parent Company Condensed Income Statement [Table Text Block] Statement of Cash Flows of Parent Company Condensed Cash Flow Statement [Table Text Block] 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 Total Operating Leases, Future Minimum Payments Due 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. Total commercial property loans Commercial Property Loan [Member] Commercial property loan. Retail Commercial Real Estate Retail [Member] Commercial real estate Retail. Other Commercial Real Estate Other [Member] Commercial real estate other. Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Capital Ratios of Hanmi Financial and Bank Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Share-based compensation expense Share-based Compensation Related tax benefits Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 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 Total non-accrual Non-PCI loans 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. Loss Contingencies [Line Items] Loss Contingencies [Line Items] Total undisbursed loan commitments Undisbursed Loan Commitments Undisbursed loan commitments. FHLB Advances Schedule Of Federal Home Loan Bank Advances And Other Borrowings Maturities Table [Table Text Block] Tabular disclosure of amount outstanding under Federal Home Loan Bank borrowings and other borrowings. Summary of Contractual Maturities Pertaining to FHLB Schedule Of Federal Home Loan Bank Advances By Year Of Contractual Maturity Table [Table Text Block] Schedule Of Federal Home Loan Bank Advances By Year Of Contractual Maturity Table [Text Block] Summary of Financial Data Pertaining to Federal Home Loan Bank Advances Federal Home Loan Bank Advances And Related Weighted Average Interest Rates Table [Table Text Block] Federal Home Loan Bank Advances And Related Weighted Average Interest Rates Table [Text Block] Future Minimum Annual Rental Commitments under Non-Cancelable Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] 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, 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 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Number of Shares, Restricted stock granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Number of Shares, Restricted stock vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Number of Shares, Restricted stock forfeited 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 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) Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Rental expenses Operating Leases, Rent Expense Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Home equity lines of credit Home Equity Line of Credit [Member] Other Commercial Real Estate Other, Including Gas Stations [Member] Commercial Real Estate Other, Including Gas Stations [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Loans and leases receivable Allowance for loan and lease losses Loans and leases receivable, net Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] $10.80 to $14.99 Exercise Price Range Range One [Member] Exercise Price Range Range One [Member] $15.00 to $19.99 Exercise Price Range Range Three [Member] Exercise Price Range Range Three [Member] $20.00 to $24.83 Exercise Price Range Range Four [Member] Exercise Price Range Range Four [Member] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Exercise Price Range, Lower Limit (in usd per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Exercise Price Range, Upper Limit (in usd per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Options Outstanding, Number of Shares (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options Outstanding, Weighted-Average Exercise Price Per Share (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options Outstanding, Weighted-Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options Exercisable, Number of Shares (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Options Exercisable, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Options Exercisable, Weighted-Average Exercise Price Per Share (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Options Exercisable, Weighted-Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Intrinsic value of stock options outstanding (in usd per share) 2019 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Total Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] U.S. treasury securities US Treasury Bill Securities [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] 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 Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Cash Cash and Cash Equivalents, at Carrying Value Investment in consolidated subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Other assets Other Assets Other liabilities Total liabilities Stockholders’ equity Activity in Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Allowance for off-balance sheet items [Member] SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Balance at beginning of period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Provision SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) Balance at end of period Fair value of options vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Total intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Proceeds from exercise of stock options Proceeds from Stock Options Exercised 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) Number of Shares, Options exercised (shares) Number of Shares, Options forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Number of Shares, Options expired (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations 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, 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) 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 forfeited (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Options expired (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations 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) Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] 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 Percentage, Total capital to risk-weighted assets Capital to Risk Weighted Assets Actual Capital Percentage, Tier 1 capital to risk-weighted assets Tier One Risk Based Capital to Risk Weighted Assets Actual Capital Percentage, 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 Percentage, 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 average 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 Percentage, Total capital to risk-weighted assets Capital Required to be Well Capitalized to Risk Weighted Assets Minimum to Be Categorized as Well Capitalized Percentage, 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 Percentage, 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 Percentage, Tier 1 capital to average assets Tier One Leverage Capital Required to be Well Capitalized to Average Assets Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Hanmi Bank Hanmi Bank [Member] Hanmi Bank [Member] Regulatory Asset [Axis] Regulatory Asset [Axis] Regulatory Asset [Domain] Regulatory Asset [Domain] Depository Institutions Deposit Institutions [Member] Deposit Institutions [Member] Minimum ratio of qualifying total capital to risk-weighted assets Minimum ratio of Tier 1 capital to risk-weighted assets