Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Document Type Document Type Current Fiscal Year End Date Current Fiscal Year End Date Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Amendment Flag Amendment Flag Entity Central Index Key Entity Central Index Key Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Current Reporting Status Entity Current Reporting Status Entity Shell Company Entity Shell Company Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Transition Period Entity Ex Transition Period Entity Public Float Entity Public Float Receivables [Abstract] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Real Estate Real Estate Loan Portfolio Segment [Member] Real Estate Loan Portfolio Segment [Member] Commercial and Industrial Commercial And Industrial Portfolio Segment [Member] Commercial And Industrial Portfolio Segment [Member] Consumer Consumer Portfolio Segment [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Allowance for Doubtful Accounts Receivable [Roll Forward] Allowance for Doubtful Accounts Receivable [Roll Forward] Balance at beginning of year Loans and Leases Receivable, Allowance Charge-offs Allowance for Loan and Lease Losses, Write-offs Recoveries on loans previously charged off Allowance for Loan and Lease Loss, Recovery of Bad Debts Provision for loan losses Provision for Loan and Lease Losses Balance at end of year Allowance for loan losses: Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Total Loans receivable: Loans Receivable, Net [Abstract] Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Total Loans and Leases Receivable, Gross Statement of Financial Position [Abstract] Assets Assets [Abstract] Cash and due from banks Cash and Due from Banks Interest-bearing deposits in other financial institutions Interest-bearing Deposits in Banks and Other Financial Institutions Total cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Securities available-for-sale, at fair value Debt Securities, Available-for-sale Securities held-to-maturity, at amortized cost (fair value of $21,152 at December 31, 2018 and $20,997 at December 31, 2017) Debt Securities, Held-to-maturity Total investment securities Debt Securities Loans held-for-sale Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Loans held-for-investment, net of deferred loan costs (fees) Allowance for loan losses Net loans held-for-investment Loans and Leases Receivable, Net Amount Premises and equipment, net Property, Plant and Equipment, Net Federal Home Loan Bank and other restricted stock, at cost Federal Home Loan Bank Stock and Federal Reserve Bank Stock Other real estate owned, net Repossessed Assets Deferred tax assets, net Deferred Income Tax Assets, Net Servicing assets Servicing Asset at Amortized Cost Accrued interest receivable and other assets Accrued Interest Receivable And Other Assets Accrued Interest Receivable And Other Assets Total assets Assets Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Deposits: Deposits [Abstract] Noninterest-bearing demand Noninterest-bearing Deposit Liabilities Savings, NOW and money market accounts Deposits, Savings, Money Market Deposits And Negotiable Order Of Withdrawal (NOW) Deposits, Savings, Money Market Deposits And Negotiable Order Of Withdrawal (NOW) Time deposits of $250,000 or less Time Deposits, Of $250,000 Or Less Time Deposits, Of $250,000 Or Less Time deposits of more than $250,000 Time Deposits, Of More Than $250,000 Time Deposits, Of More Than $250,000 Total deposits Deposits Federal Home Loan Bank advances Advances from Federal Home Loan Banks Accrued interest payable and other liabilities Accrued Liabilities and Other Liabilities Total liabilities Liabilities Commitments and contingent liabilities Commitments and Contingencies Preferred stock, 10,000,000 shares authorized, no par value, 0 issued and outstanding shares Preferred Stock, Value, Issued Common stock, 60,000,000 shares authorized, no par value; 15,977,754 and 13,417,899 shares issued and outstanding at December 31, 2018 and 2017, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss, net Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders’ equity Liabilities and Equity Transfers and Servicing [Abstract] Total servicing assets Financial assets transferred and accounted for as a sale Cash Flows Between Transferor and Transferee, Proceeds from New Transfers Gain on loans transferred and accounted for as sales Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale Servicing income Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Product Information [Table] Schedule of Product Information [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] California CALIFORNIA New Jersey NEW JERSEY New York NEW YORK Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Closed Loans Closed Loans [Member] Closed Loans [Member] Open Loans Open Loans [Member] Open Loans [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Furniture, fixtures and equipment Furniture and Fixtures [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Retained Earnings Retained Earnings [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] 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] Product Information [Line Items] Product Information [Line Items] Number of operating segments Number of Operating Segments Number of full-service branches Number Of Full-Service Branches Number Of Full-Service Branches Number of loan producing offices Number Of Loan Production Offices Number Of Loan Production Offices Reserve and clearing required balance Restricted Cash and Cash Equivalents Charge-off time period Financing Receivable, Threshold Period Past Due, Writeoff Threshold period for when financing receivable is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Estimated useful lives Property, Plant and Equipment, Useful Life Qualified affordable housing project investments Amortization Method Qualified Affordable Housing Project Investments Unfunded commitments Qualified Affordable Housing Project Investments, Commitment Amortization recognized on Qualified Affordable Housing Projects Amortization Method Qualified Affordable Housing Project Investments, Amortization Federal tax credits and other benefits Affordable Housing Tax Credits and Other Tax Benefits, Amount Affordable Housing Project Investment, Write-down, Amount Affordable Housing Project Investment, Write-down, Amount Reclassification of disproportionate tax effect 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. Right-of-Use Asset Operating Lease, Right-of-Use Asset Operating lease liability Operating Lease, Liability Investments, Debt and Equity Securities [Abstract] Marketable Securities [Table] Marketable Securities [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Mortgage-backed securities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Collateralized mortgage obligations Collateralized Mortgage Obligations [Member] SBA loan pool securities SBA Loan Pool Securities [Member] SBA Loan Pool Securities [Member] Municipal bonds Municipal Bonds [Member] Marketable Securities [Line Items] Marketable Securities [Line Items] Securities available-for-sale: Debt Securities, Available-for-sale, Gain (Loss) [Abstract] Amortized Cost Debt Securities, Available-for-sale, 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 Securities held-to-maturity: Debt Securities, Held-to-maturity [Abstract] Amortized Cost Gross Unrealized Gain Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Gross Unrealized Loss Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Fair Value Debt Securities, Held-to-maturity, Fair Value Pledged securities for collateral Pledged Financial Instruments, Not Separately Reported, Securities Mortgage-backed securities Securities available-for-sale: Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Less Than 12 Months, Fair Value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Less Than 12 Months, Gross Unrealized Losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Less Than 12 Months, Number of Securities Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 12 months or Longer, Fair Value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 12 months or Longer, Gross Unrealized Losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 12 months or Longer, Number of Securities Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Total, Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position Total, Gross Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Total, Number of Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Securities held-to-maturity: Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] Less Than 12 Months, Fair Value Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Less Than 12 Months, Gross Unrealized Losses Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Less Than 12 Months, Number of Securities Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less Than 12 Months, Number Of Positions Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less Than 12 Months, Number Of Positions 12 Months or Longer, Fair Value Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 12 Months or Longer, Gross Unrealized Losses Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 12 Months or Longer, Number of Securities Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months Or Longer, Number Of Positions Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months Or Longer, Number Of Positions Total, Fair Value Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value Total, Gross Unrealized Losses Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss Total, Number of Securities Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Number Of Positions Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Number Of Positions OTTI, debt securities, including in earnings Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings Amortized Cost, Within one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Amortized Cost, One to five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost Amortized Cost, Five to ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost Amortized Cost, Greater than ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Amortized Cost, Mortgage-backed securities, collateralized mortgage obligations and SBA pool securities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Fair Value, Within one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Fair Value, One to five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Fair Value, Five to ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Fair Value, Greater than ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Fair Value, Mortgage-backed securities, collateralized mortgage obligations and SBA pool securities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Fair Value Amortized Cost, Within one year Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Amortized Cost, One to five years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost Amortized Cost, Five to ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost Amortized Cost, Greater than ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Amortized Cost, Mortgage-backed securities, collateralized mortgage obligations and SBA pool securities Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost Fair Value, Within one year Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Fair Value, One to five years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Fair Value, Five to ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Fair Value, Greater than ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Fair Value, Mortgage-backed securities, collateralized mortgage obligations and SBA pool securities Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value Fair Value Earnings Per Share [Abstract] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Income Tax Disclosure [Abstract] Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] Cash dividend on common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Earnings Per Share Earnings Per Share [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [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] Financial assets: Assets, Fair Value Disclosure [Abstract] Interest-bearing deposits in other financial institutions Interest-bearing Deposits In Other Financial Institutions, Fair Value Disclosure Interest-bearing Deposits In Other Financial Institutions, Fair Value Disclosure Securities available-for-sale Securities held-to-maturity Loans held-for-sale Loans Held-for-sale, Fair Value Disclosure Net loans held-for-investment Loans Receivable, Fair Value Disclosure FHLB and other restricted stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Accrued interest receivable Receivables, Fair Value Disclosure Financial liabilities: Financial Liabilities Fair Value Disclosure [Abstract] Deposits Deposits, Fair Value Disclosure FHLB advances Federal Home Loan Bank Borrowings, Fair Value Disclosure Accrued interest payable Accrued Liabilities, Fair Value Disclosure Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Common stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [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 year Beginning balance (in shares) Common Stock, Shares, Outstanding Net income Net Income (Loss) Attributable to Parent Other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Stock issued under stock offering, net of expenses Stock Issued During Period, Value, New Issues Stock issued under stock offering, net of expenses (in shares) Stock Issued During Period, Shares, New Issues Share-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock options exercised Stock Issued During Period, Value, Stock Options Exercised Stock options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Retirement of fractional shares Stock Repurchased and Retired During Period, Value Retirement of fractional shares (in shares) Stock Repurchased and Retired During Period, Shares Retroactive adjustment for stock dividend declared on December 13, 2016 Reclassification From Retained Earnings, Dividend Declared Reclassification From Retained Earnings, Dividend Declared Cash dividends declared on common stock Dividends, Common Stock, Cash Balance at end of year Ending balance (in shares) Revenue from Contract with Customer [Abstract] Revenue Recognition Revenue from Contract with Customer [Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Net (gain) loss on sales Gain (Loss) On Sales [Member] Gain (Loss) On Sales [Member] Operating expenses, net of rental income Operating Expenses, Net Of Rental Income [Member] Operating Expenses, Net Of Rental Income [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable, Classified [Abstract] Accounts, Notes, Loans and Financing Receivable, Classified [Abstract] Balance at beginning of year Additions Real Estate Owned, Additions Real Estate Owned, Additions Sales Real Estate Owned, Disposals Real Estate Owned, Disposals Net change in valuation allowance Real Estate Owned, Valuation Allowance, Period Increase (Decrease) Balance at end of year Real Estate Owned Valuation Allowance [Roll Forward] Real Estate Owned Valuation Allowance [Roll Forward] Balance at beginning of year Real Estate Owned, Valuation Allowance Additions Real Estate Owned, Valuation Allowance, Valuation Increase Net direct write-downs and removal from sale Real Estate Owned, Valuation Allowance, Amounts Applied Balance at end of year Expenses related to OREOs Gains (Losses) on Sales of Other Real Estate Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Commercial property Commercial Real Estate [Member] SBA loan pool securities SBA Property [Member] SBA Property [Member] Commercial term Commercial Term Loans [Member] Commercial Term Loans [Member] Commercial lines of credit Commercial Lines of Credit [Member] Commercial Lines of Credit [Member] SBA commercial term SBA Commercial Term Loans [Member] SBA Commercial Term Loans [Member] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Loans Modified as TDRs as of Period End [Abstract] Loans Modified as TDRs as of Period End [Abstract] Loans Modified as TDRs as of Period End [Abstract] Accruing Financing Receivable, Modifications, Recorded Investment, Accruing Financing Receivable, Modifications, Recorded Investment, Accruing Nonaccrual Financing Receivable, Modifications, Recorded Investment, Nonaccrual Financing Receivable, Modifications, Recorded Investment, Nonaccrual Total Financing Receivable, Modifications, Recorded Investment Commitments to lend to customers with outstanding loans classified as TDRs Financing Receivable, Modifications, Commitments Financing Receivable, Modifications, Commitments TDRs, allowance for credit losses Financing Receivable, Modifications, Allowance For Credit Losses Financing Receivable, Modifications, Allowance For Credit Losses Loans Modified as TDRs During the Period [Abstract] Loans Modified as TDRs During the Period [Abstract] Loans Modified as TDRs During the Period [Abstract] Number of Loans Financing Receivable, Modifications, Number of Contracts Pre-Modification Recorded Investment Financing Receivable, Modifications, Pre-Modification Recorded Investment Post-Modification Recorded Investment Financing Receivable, Modifications, Post-Modification Recorded Investment Loans Modified as TDRs, Subsequent Payment Defaults [Abstract] Loans Modified as TDRs, Subsequent Payment Defaults [Abstract] Loans Modified as TDRs, Subsequent Payment Defaults [Abstract] Number of Loans Financing Receivable, Modifications, Subsequent Default, Number of Contracts Recorded Investment at Date of Default Financing Receivable, Modifications, Subsequent Default, Recorded Investment Other Real Estate Owned, Activity Real Estate Owned, Activity [Table Text Block] Real Estate Owned, Activity [Table Text Block] Other Real Estate Owned Valuation Allowance Real Estate Owned, Valuation Allowance [Table Text Block] Real Estate Owned, Valuation Allowance [Table Text Block] Other Real Estate Owned, Expenses Real Estate Owned, Expenses [Table Text Block] Real Estate Owned, Expenses [Table Text Block] Statutory federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State franchise tax, net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Share-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Remeasurement from the Tax Cuts and Jobs Act Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act Of 2017, Amount Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017. Other items, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Disclosure of Compensation Related Costs, Share-based Payments [Abstract] 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] Options, Outstanding at beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options, Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Options, Exercised (in shares) Options, Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options, Outstanding at end of year (in shares) Options, Exercisable (in 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, Outstanding at beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Exercised (in dollars 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, Forfeited (in dollars 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, Outstanding at ending of period (in dollars per share) Weighted-Average Exercise Price Per Share, Exercisable (in dollars 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, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted-Average Contractual Term, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted-Average Contractual Term, Granted Share-based Compensation Arrangement By Share-based Payment Award, Options, Grants In Period, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement By Share-based Payment Award, Options, Grants In Period, Weighted Average Remaining Contractual Term Weighted-Average Contractual Term, Exercised Share-based Compensation Arrangement By Share-based Payment Award, Options, Exercises In Period, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement By Share-based Payment Award, Options, Exercises In Period, Weighted Average Remaining Contractual Term Weighted-Average Contractual Term, Forfeited Share-based Compensation Arrangement By Share-based Payment Award, Options, Forfeitures In Period, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement By Share-based Payment Award, Options, Forfeitures In Period, Weighted Average Remaining Contractual Term Weighted-Average Contractual Term, Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value, Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate Intrinsic Value, Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Total current income tax expense Current Federal, State and Local, Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) Adjustment of deferred tax assets for enacted changes in tax rate Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit) Amount of income tax expense (benefit) for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017. State Deferred State and Local Income Tax Expense (Benefit) Total deferred income tax expense Deferred Income Tax Expense (Benefit) Total Income Tax Expense (Benefit) 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] Option Employee Stock Option [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 options authorized to be purchased Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Shares available for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based compensation expense Allocated Share-based Compensation Expense Realized income tax benefits related to share-based compensation Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Unrecognized share-based compensation expense on outstanding stock options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Weighted average recognition period for recognition of share-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Award contractual term Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Retirement Benefits [Abstract] Employee Benefit Plans Compensation and Employee Benefit Plans, Other than Share-based Compensation [Text Block] Equity [Abstract] Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Residential property Residential Real Estate [Member] Transfer of loans to held-for-sale Financing Receivable, Reclassification to Held-for-sale Sales of loans held-for-investment Financing Receivable, Significant Sales Purchases of loans held-for-investment Financing Receivable, Significant Purchases Debt Disclosure [Abstract] Federal Home Loan Bank Advances and Other Borrowings Federal Home Loan Bank Advances, Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Leasehold improvements Leasehold Improvements [Member] Computer equipment Computer Equipment [Member] Computer software Computer Software, Intangible Asset [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Total premises and equipment Property, Plant and Equipment, Gross Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, Plant and Equipment, Net Depreciation of premises and equipment Depreciation Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Total rental expense Operating Leases, Rent Expense Schedule of Servicing Assets at Fair Value [Table] Schedule of Servicing Assets at Fair Value [Table] Servicing Assets at Fair Value [Line Items] Servicing Assets at Fair Value [Line Items] Carrying amount Servicing asset, fair value Servicing Asset at Amortized Cost, Fair Value Discount rates Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Prepayment speeds Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed Weighted average remaining life Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life Underlying loans being serviced Servicing Assets, Principal Value Of Loans Being Serviced Servicing Assets, Principal Value Of Loans Being Serviced Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] FHLB Advances Federal Home Loan Bank Advances [Member] Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank Branch [Domain] FHLB of San Francisco Federal Home Loan Bank of San Francisco [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Maturity term Debt Instrument, Term Fixed Rate Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract] Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate [Abstract] Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate [Abstract] 2019 Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, under One Year 2020 Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Year Two Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Year Two 2021 Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Year Three Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Year Three 2022 Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Year Four Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Year Four 2023 and Thereafter Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Due Year Five Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Due Year Five Total Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate Variable Rate Federal Home Loan Bank, Advances by Interest Rate Type, by Maturity [Abstract] 2019 Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, under One Year 2020 Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Year Two Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Year Two 2021 Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Year Three Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Year Three 2022 Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Year Four Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Year Four 2023 and Thereafter Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Year Five Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Year Five Total Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate 2019 Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months 2020 Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two 2021 Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Three 2022 Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Four 2023 Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Five Advances from Federal Home Loan Banks Federal Home Loan Bank, Advances, Activity for Year [Abstract] Federal Home Loan Bank, Advances, Activity for Year [Abstract] Weighted-average interest rate at end of year Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate at Period End Average interest rate during the year Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year Average balance 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 Loans pledged to secure borrowings Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Investment in capital stock of the FHLB Federal Home Loan Bank Stock Additional borrowing capacity Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds Unused borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Loans pledged as collateral Debt Instrument, Collateral Amount Borrowings outstanding Line of Credit, Current Overnight federal funds lines, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Banking and Thrift [Abstract] Time Deposit Maturities Time Deposit Maturities [Table Text Block] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] 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 to 59 Days Past Due Financing Receivables, 30 to 59 Days Past Due [Member] 60 to 89 Days Past Due Financing Receivables, 60 to 89 Days Past Due [Member] 90 or More Days Past Due Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Loans Insured or Guaranteed by Government Authorities [Axis] Loans Insured or Guaranteed by Government Authorities [Axis] Loans Insured or Guaranteed by Government Authorities [Domain] Loans Insured or Guaranteed by Government Authorities [Domain] Loans guaranteed by US government agency Loans Insured or Guaranteed by US Government Authorities [Member] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Loans, Still accruing Financing Receivable, Recorded Investment, Past Due Nonaccrual Financing Receivable, Recorded Investment, Nonaccrual Status Total Past Due and Nonaccrual Financing Receivable, Recorded Investment, Past Due and Nonaccrual Status Financing Receivable, Recorded Investment, Past Due and Nonaccrual Status Construction Construction Loans [Member] Trade finance Trade Finance Loans [Member] Trade Finance Loans [Member] Loans receivable from related parties Loans and Leases Receivable, Related Parties Commitments and Contingencies Disclosure [Abstract] Schedule of Outstanding Financial Commitments Other Commitments [Table Text Block] Servicing Asset at Amortized Cost [Table] Servicing Asset at Amortized Cost [Table] Servicing Asset at Amortized Cost [Line Items] Servicing Asset at Amortized Cost [Line Items] Servicing Asset at Amortized Cost, Balance [Roll Forward] Servicing Asset at Amortized Cost, Balance [Roll Forward] Balance at January 1, 2016 Additions Servicing Asset at Amortized Cost, Additions Amortization Servicing Asset at Amortized Cost, Amortization Balance at December 31, 2016 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] Unvested Options, Outstanding at beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Unvested Options, Granted (in shares) Unvested Options, Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Unvested Options, Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Unvested Options, Outstanding at end of period (in 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, Outstanding (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price Weighted-Average Exercise Price Per Share, Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted-Average Exercise Price Per Share, Vested (in dollars 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, Forfeited (in dollars 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, Outstanding (in dollars per share) Basic earnings per share: Earnings Per Share, Basic [Abstract] Weighted-average common share outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Basic earnings per share (in dollars per share) Earnings Per Share, Basic Diluted earnings per share: Earnings Per Share, Diluted [Abstract] Diluted effect of stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Diluted weighted-average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Stock options excluded in computing diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Income Statement [Abstract] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Service charges and fees on deposits Deposit Account [Member] Interest income: Interest and Dividend Income, Operating [Abstract] Interest and fees on loans Interest and Fee Income, Loans and Leases Interest on tax-exempt investment securities Interest Income, Securities, Operating, Tax Exempt Interest on investment securities Interest Income, Securities, Operating, Taxable Interest and dividends on other interest-earning assets Other Interest and Dividend Income Total interest income Interest and Dividend Income, Operating Interest expense: Interest Expense [Abstract] Interest on deposits Interest Expense, Deposits Interest on borrowings Interest Expense, Borrowings Total interest expense Interest Expense Net interest income Interest Income (Expense), Net Provision for loan losses Provision for Loan Losses Expensed Net interest income after provision for loan losses Interest Income (Expense), after Provision for Loan Loss Noninterest income: Noninterest Income [Abstract] Service charges and fees on deposits Revenue from Contract with Customer, Excluding Assessed Tax Loan servicing income Servicing Fees, Net1 Servicing Fees, Net1 Gain on sale of loans Gain (Loss) on Sales of Loans, Net Gain on sale of securities available-for-sale Debt Securities, Available-for-sale, Realized Gain (Loss) Other 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 Professional fees Professional Fees Marketing and business promotion Marketing and Advertising Expense Data processing Information Technology and Data Processing Director fees and expenses Noninterest Expense Directors Fees Loan related expenses Loan Processing Fee Regulatory assessments Regulatory Assessment Expense Regulatory Assessment Expense Other expenses Other Noninterest Expense Total noninterest expense Noninterest Expense Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense Net income Earnings per common share, basic (in dollars per share) Earnings per common share, diluted (in dollars per share) Weighted-average common shares outstanding, basic (in shares) Weighted-average common shares outstanding, diluted (in shares) Gross realized gains on sales and calls of securities available-for-sale Debt Securities, Available-for-sale, Realized Gain Gross realized losses on sales and calls of securities available-for-sale Debt Securities, Available-for-sale, Realized Loss Net realized gains (losses) on sales and calls of securities available-for-sale Proceeds from sales and calls of securities available-for-sale Proceeds from Sale and Maturity of Debt Securities, Available-for-sale Tax expense on sales and calls of securities available-for-sale Debt Securities, Available-for-sale, Tax Expense On Sales And Calls Of Securities Debt Securities, Available-for-sale, Tax Expense On Sales And Calls Of Securities Deposits Deposit Liabilities Disclosures [Text Block] Condensed Financial Information Disclosure [Abstract] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Pacific City Financial Corporation Parent Company [Member] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Cash Cash Investment in Pacific City Bank Investments In Subsidiary Investments In Subsidiary Other assets Other Assets Other liabilities Other Liabilities Total shareholders’ equity Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Deferred tax assets: Components of Deferred Tax Assets [Abstract] Allowance for loan losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Share-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Unrealized loss on investment securities Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross State tax benefit Deferred Tax Assets, State Taxes Other Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Depreciation on premises and equipment Deferred Tax Liabilities, Property, Plant and Equipment Loans held-for-sale market adjustment Deferred Tax Liabilities, Loans Held-For-Sale Market Adjustment Deferred Tax Liabilities, Loans Held-For-Sale Market Adjustment Deferred loan origination costs Deferred Tax Liabilities, Deferred Loan Origination Costs Deferred Tax Liabilities, Deferred Loan Origination Costs Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Deferred tax assets, net Deferred Tax Assets, Net Tax penalties accrued Unrecognized Tax Benefits, Income Tax Penalties Accrued Tax interest accrued Unrecognized Tax Benefits, Interest on Income Taxes Accrued Other Real Estate Owned Real Estate Owned [Text Block] Loans Held-For-Investment Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Allowance for Loan Losses Allowance for Credit Losses on Financing Receivables [Table Text Block] Risk Categories for Loans by Portfolio Segment Financing Receivable Credit Quality Indicators [Table Text Block] Aging of Past Due Accruing Loans and Nonaccrual Loans by Segment Past Due Financing Receivables [Table Text Block] Impairment by Portfolio Segment Impaired Financing Receivables [Table Text Block] Modified TDRs by Portfolio Segment Troubled Debt Restructurings on Financing Receivables [Table Text Block] Loans Held-for-Sale Loans Receivable Held For Sale [Table Text Block] Loans Receivable Held For Sale [Table Text Block] Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Schedule of Carrying Value and Estimated Fair Values of Financial Assets and Liabilities Fair Value, by Balance Sheet Grouping [Table Text Block] Income: Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract] Dividends from subsidiary Dividends From Subsidiary Dividends From Subsidiary Total income Revenues Expense: Operating Expenses [Abstract] Income (loss) before taxes and equity in undistributed subsidiary income Income tax benefit Income (loss) before equity in undistributed subsidiary income Income (Loss) From Continuing Operations Before Subsidiary Income And Noncontrolling Interest Income (Loss) From Continuing Operations Before Subsidiary Income And Noncontrolling Interest Equity in undistributed subsidiary income Income (Loss) from Subsidiaries, Net of Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Cash received from options exercised Proceeds from Stock Options Exercised Tax benefit from options exercised Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options Weighted-average estimated fair value per share of options granted (in dollars per share) 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] Equity in undistributed subsidiary income Change in other assets Increase (Decrease) in Other Operating Assets Change in other liabilities Increase (Decrease) in 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] Capital contribution to subsidiary Payments For Capital Contributions To Subsidiary Payments For Capital Contributions To Subsidiary 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] Stock issued under stock offering, net of expenses Proceeds from Issuance of Common Stock Stock options exercised Cash dividends paid on common stock Payments of Ordinary Dividends, Common Stock Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected stock price volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Time Deposits [Table] Time Deposits [Table] Geographic Distribution [Axis] Geographic Distribution [Axis] Geographic Distribution [Domain] Geographic Distribution [Domain] California State Treasurer's Deposits Geographic Distribution, Domestic [Member] Time Deposits [Line Items] Time Deposits [Line Items] Total deposits Total interest-bearing deposits Interest-bearing Deposit Liabilities Deposits reclassified as loans or overdrafts Deposit Liabilities Reclassified as Loans Receivable Time Deposits, $250,000 or More, Threshold Time Deposits, at or Above FDIC Insurance Limit Securities pledged for deposits, amortized cost Brokered deposits Interest-bearing Domestic Deposit, Brokered Related party deposits Related Party Deposit Liabilities Time deposits of $250,000 or less Time Deposits, Fiscal Year Maturity, $250,000 Or Less [Abstract] Time Deposits, Fiscal Year Maturity, $250,000 Or Less [Abstract] 2019 Time Deposit Maturities, $250,000 Or Less, Next Twelve Months Time Deposit Maturities, $250,000 Or Less, Next Twelve Months 2020 Time Deposit Maturities, $250,000 Or Less, Year Two Time Deposit Maturities, $250,000 Or Less, Year Two 2021 Time Deposit Maturities, $250,000 Or Less, Year Three Time Deposit Maturities, $250,000 Or Less, Year Three 2022 Time Deposit Maturities, $250,000 Or Less, Year Four Time Deposit Maturities, $250,000 Or Less, Year Four 2023 Time Deposit Maturities, $250,000 Or Less, Year Five Time Deposit Maturities, $250,000 Or Less, Year Five Thereafter Time Deposit Maturities, $250,000 Or Less, After Year Five Time Deposit Maturities, $250,000 Or Less, After Year Five Total Time Deposit Maturities, $250,000 Or Less Time Deposit Maturities, $250,000 Or Less Time deposits of more than $250,000 Time Deposits, Fiscal Year Maturity, More Than $250,000 [Abstract] Time Deposits, Fiscal Year Maturity, More Than $250,000 [Abstract] 2019 Time Deposit Maturities, More Than $250,000, Next Twelve Months Time Deposit Maturities, More Than $250,000, Next Twelve Months 2020 Time Deposit Maturities, More Than $250,000, Year Two Time Deposit Maturities, More Than $250,000, Year Two 2021 Time Deposit Maturities, More Than $250,000, Year Three Time Deposit Maturities, More Than $250,000, Year Three 2022 Time Deposit Maturities, More Than $250,000, Year Four Time Deposit Maturities, More Than $250,000, Year Four 2023 Time Deposit Maturities, More Than $250,000, Year Five Time Deposit Maturities, More Than $250,000, Year Five Thereafter Time Deposit Maturities, More Than $250,000, After Year Five Time Deposit Maturities, More Than $250,000, After Year Five Total Time Deposit Maturities, More Than $250,000 Time Deposit Maturities, More Than $250,000 Total time deposits Time Deposits, Fiscal Year Maturity [Abstract] 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 Thereafter Time Deposit Maturities, after Year Five Total Time Deposits Loans and Allowance for Loan Losses Financing Receivables [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates in the Preparation of Financial Statements Use of Estimates, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Investment Securities Investment, Policy [Policy Text Block] Loans Held-For-Sale Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] Loans Held-For-Investment Finance, Loan and Lease Receivables, Held-for-investment, Policy [Policy Text Block] Allowance for Loan Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Federal Home Loan Bank and Other Restricted Stock Federal Home Loan Bank And Other Restricted Stock Policy [Policy Text Block] Federal Home Loan Bank And Other Restricted Stock Policy [Policy Text Block] Other Real Estate Owned Finance, Loan and Lease Receivables, Held for Investments, Foreclosed Assets Policy [Policy Text Block] Servicing Assets Transfers and Servicing of Financial Assets, Servicing of Financial Assets, Policy [Policy Text Block] Investments in Qualified Affordable Housing Projects Investments In Qualified Affordable Housing Projects Policy [Policy Text Block] Investments In Qualified Affordable Housing Projects Policy [Policy Text Block] Earnings Per Common Share Earnings Per Share, Policy [Policy Text Block] Transfers of Financial Assets Transfers and Servicing of Financial Assets, Policy [Policy Text Block] Share-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Commitments and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Adopted Accounting Pronouncements and Recent Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Servicing Assets Transfers and Servicing of Financial Assets [Text Block] Statement of Comprehensive Income [Abstract] Parent Parent [Member] Other comprehensive loss: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Unrealized loss on securities available-for-sale arising during the year Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Add: reclassification adjustment for net gain included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Income tax benefit related to items of other comprehensive income Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent Total other comprehensive loss, net of tax Securities held-to-maturity, fair value Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, issued (in shares) Preferred Stock, Shares Issued Preferred stock, outstanding (in shares) Preferred Stock, Shares Outstanding Common stock, authorized (in shares) Common Stock, Shares Authorized Common stock, issued (in shares) Common Stock, Shares, Issued Common stock, outstanding (in shares) Schedule of Maturities of FHLB Advances and Financial Data Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block] Statement of Cash Flows [Abstract] Amortization of net premiums on securities Accretion (Amortization) of Discounts and Premiums, Investments Net accretion of deferred loan costs (fees) Amortization of Deferred Loan Origination Fees, Net Amortization of servicing assets Deferred tax expense Share-based compensation Share-based Compensation Gain on sale of securities Gain on sale of loans Originations of loans held-for-sale Payments for Origination of Mortgage Loans Held-for-sale Proceeds from sales of and principal collected on loans held-for-sale Proceeds from Sale and Collection of Loans Held-for-sale Change in accrued interest receivable and other assets Increase (Decrease) in Accrued Interest Receivable, Net Change in accrued interest payable and other liabilities Increase (Decrease) in Interest Payable, Net Purchase of securities available-for-sale Payments to Acquire Debt Securities, Available-for-sale Proceeds from sale of securities available-for-sale Proceeds from Sale of Debt Securities, Available-for-sale Proceeds from sales and calls of securities available-for-sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Purchase of securities held-to-maturity Payments to Acquire Held-to-maturity Securities Proceeds from maturities, calls, and paydowns of securities held-to-maturity Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Proceeds from sale of loans held-for-investment Proceeds from Sale of Loans and Leases Held-for-investment Net increase in loans held-for-investment Payments to Acquire Loans and Leases Held-for-investment Purchase of Federal Home Loan Bank stock Payments to Acquire Federal Home Loan Bank Stock Proceeds from sale of other real estate owned Proceeds from Sale of Other Real Estate Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Net increase in deposits Increase (Decrease) in Deposits Proceeds from long-term Federal Home Loan Bank advances Proceeds from FHLBank Borrowings, Financing Activities Repayment of long-term Federal Home Loan Bank advances Payments of FHLBank Borrowings, Financing Activities Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Income taxes paid Income Taxes Paid Supplemental disclosures of non-cash investment activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Loans transferred to loans held-for-sale Transfer of Portfolio Loans and Leases to Held-for-sale Loans transferred to other real estate owned Real Estate Owned, Transfer to Real Estate Owned Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Monthly service fees Monthly Service Fees [Member] Monthly Service Fees [Member] Account analysis fees Account Analysis Fees [Member] Account Analysis Fees [Member] Non-sufficient funds charges Non-sufficient Funds Charges [Member] Non-sufficient Funds Charges [Member] Other deposit related fees Other Deposit Related Fees [Member] Other Deposit Related Fees [Member] Debit card fees Debit Card Fees [Member] Debit Card Fees [Member] Gain (loss) on sale of other real estate owned Gain (Loss) On Sale Of Other Real Estate Owned [Member] Gain (Loss) On Sale Of Other Real Estate Owned [Member] Wire transfer fees Wire Transfer Fees [Member] Wire Transfer Fees [Member] Other service charges Other Service Charges [Member] Other Service Charges [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Initial Public Offering IPO [Member] Underwriter Option Over-Allotment Option [Member] Private Placement Private Placement [Member] Class of Stock [Line Items] Class of Stock [Line Items] Offering price (in dollars per share) Shares Issued, Price Per Share Net proceeds from issuance of common stock Sale of Stock, Consideration Received on Transaction Underwriter option term Sale Of Stock, Underwriter Option Term Sale Of Stock, Underwriter Option Term Underwriter option, shares issuable (in shares) Sale Of Stock, Number Of Shares Issuable In Transaction Sale Of Stock, Number Of Shares Issuable In Transaction Stock dividend percent Dividends, Declared, Stock Dividend Percent Dividends, Declared, Stock Dividend Percent Payments for fractional shares Payments of Dividends Dividends Condensed Balance Sheet Condensed Balance Sheet [Table Text Block] Condensed Statements of Income and Comprehensive Income Condensed Financial Statements [Table Text Block] Condensed Statements of Cash Flows Condensed Cash Flow Statement [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] SBA property Small Business Association Property [Member] Small Business Association Property [Member] Other real estate owned Other Real Estate Owned [Member] Other Real Estate Owned [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Net gains (losses) recognized Fair Value Measurements, Nonrecurring, Gain (Loss) Fair Value Measurements, Nonrecurring, Gain (Loss) Employer matching contribution, percent of match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Percent of employees gross pay, employer matching contribution Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Company's contribution to employee benefit plans Defined Contribution Plan, Cost Summary of Weighted-Average Assumptions of Options Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] Summary of Option Activity Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Pacific City Bank Subsidiaries [Member] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Capital conservation buffer Capital Conservation Buffer Capital Conservation Buffer Actual Compliance with Regulatory Capital Requirements under Banking Regulations, Actual [Abstract] Compliance with Regulatory Capital Requirements under Banking Regulations, Actual [Abstract] Common tier 1 capital (to risk-weighted assets), amount Common Equity Tier One Capital Common tier 1 capital (to risk-weighted assets), ratio Common Equity Tier One Capital Ratio Total capital (to risk-weighted assets), amount Capital Total capital (to risk-weighted assets), ratio Capital to Risk Weighted Assets Tier 1 capital (to risk-weighted assets), amount Tier One Risk Based Capital Tier 1 capital (to risk-weighted assets), ratio Tier One Risk Based Capital to Risk Weighted Assets Tier 1 capital (to average assets), amount Tier One Leverage Capital Tier 1 capital (to average assets), ratio Tier One Leverage Capital to Average Assets Minimum Capital Requirement Compliance with Regulatory Capital Requirements under Banking Regulations, Minimum Capital Requirements [Abstract] Compliance with Regulatory Capital Requirements under Banking Regulations, Minimum Capital Requirements [Abstract] Common tier 1 capital (to risk-weighted assets), amount Common Equity Tier One Capital Required for Capital Adequacy Common tier 1 capital (to risk-weighted assets), ratio Common Equity Tier 1 Capital Required for Capital Adequacy to Risk Weighted Assets Common Equity Tier 1 Capital Required for Capital Adequacy to Risk Weighted Assets Total capital (to risk-weighted assets), amount Capital Required for Capital Adequacy Total capital (to risk-weighted assets), ratio Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 capital (to risk-weighted assets), amount Tier One Risk Based Capital Required for Capital Adequacy Tier 1 capital (to risk-weighted assets), ratio Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 capital (to average assets), amount Tier One Leverage Capital Required for Capital Adequacy Tier 1 capital (to average assets), ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets To Be Well Capitalized Under Prompt Corrective Provisions Compliance with Regulatory Capital Requirements under Banking Regulations, To Be Well Capitalized Under Prompt Corrective Provisions [Abstract] Compliance with Regulatory Capital Requirements under Banking Regulations, To Be Well Capitalized Under Prompt Corrective Provisions [Abstract] Common tier 1 capital (to risk-weighted assets), amount Common Equity Tier One Capital Required to be Well-Capitalized Common tier 1 capital (to risk-weighted assets), ratio Common Equity Tier 1 Capital Required to be Well Capitalized to Risk Weighted Assets Common Equity Tier 1 Capital Required to be Well Capitalized to Risk Weighted Assets Total capital (to risk-weighted assets), amount Capital Required to be Well Capitalized Total capital (to risk-weighted assets),