Subordinated Borrowings [Abstract] Subordinated Borrowing [Table] Subordinated Borrowing [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Trust Preferred Securities Subject to Mandatory Redemption Trust Preferred Securities Subject to Mandatory Redemption [Member] Convertible Notes Convertible Debt [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other assets Other Assets [Member] Subordinated Borrowing [Line Items] Subordinated Borrowing [Line Items] Number of wholly owned subsidiary grantor trusts Number of Grantor Trusts Issuing Securities Number of Grantor Trusts Issuing Securities Amount of pooled trust preferred securities issued Trust Preferred Security Amount Trust Preferred Security Amount Right to defer consecutive payments of interest, maximum term Subordinated Borrowing, Right to Defer Consecutive Payments of Interest Term, Maximum Subordinated Borrowing, Right to Defer Consecutive Payments of Interest Term, Maximum Investment in common trust securities Investment in Common Trust Securities Investment in Common Trust Securities Percent included in tier one capital, maximum Debt Issuance To Capital, Percent Included in Tier One Capital, Maximum Debt Issuance To Capital, Percent Included in Tier One Capital, Maximum Excess of percent threshold included in tier two capital Debt Issuance To Capital, Excess Of Percent Threshold, Included in Tier Two Capital Debt Issuance To Capital, Excess Of Percent Threshold, Included in Tier Two Capital Aggregate principal amount issued Debt Instrument, Face Amount Interest rate Debt Instrument, Interest Rate, Stated Percentage Additional face amount issued as part of initial offering over-allotment option Debt Instrument, Face Amount, Initial Offering Over-Allotment Option, Additional Amount Issued Debt Instrument, Face Amount, Initial Offering Over-Allotment Option, Additional Amount Issued Initial conversion rate Debt Instrument, Convertible, Conversion Ratio Initial conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Premium percentage to closing stock price on date of pricing of the notes Debt Instrument, Convertible, Conversion Price, Premium on Closing Stock Price, Percent Debt Instrument, Convertible, Conversion Price, Premium on Closing Stock Price, Percent Call option, percentage of principal amount in cash Debt Instrument, Convertible, Callable Option, Cash As Percentage Of Principal Amount Debt Instrument, Convertible, Callable Option, Cash As Percentage Of Principal Amount Repurchase or put option, percentage of principal amount in cash Debt Instrument, Convertible, Repurchase Or Put Option, Cash As Percentage Of Principal Amount Debt Instrument, Convertible, Repurchase Or Put Option, Cash As Percentage Of Principal Amount Amount of proceeds from convertible notes authorized for repurchase of common stock Proceeds From Convertible Debt, Amount Authorized For Repurchase Of Common Stock Proceeds From Convertible Debt, Amount Authorized For Repurchase Of Common Stock Proceeds from convertible notes, net of issuance fees Proceeds from Convertible Debt Proceeds down-streamed to the Bank as equity Proceeds From Convertible Debt, Amount Down-Streamed As Equity Proceeds From Convertible Debt, Amount Down-Streamed As Equity Repurchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Closing price of common stock (in dollars per share) Share Price Common stock repurchased and recorded as treasury stock (in shares) Treasury Stock, Shares, Acquired Weighted average price of repurchased shares (in dollars per share) Treasury Stock Acquired, Average Cost Per Share Discount rate Fair Value Inputs, Discount Rate Amortization/ Capitalization Period Debt Instrument, Convertible, Remaining Discount Amortization Period Interest expense on convertible notes Interest Expense, Debt Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Restricted and Performance Based Units [Table] Schedule of Restricted and Performance Based Units [Table] Schedule of Restricted and Performance Based Units [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Retricted and performance unit activity Retricted And Performance Unit Activity [Member] Retricted And Performance Unit Activity [Member] Performance shares Performance Shares [Member] Stock options Employee Stock Option [Member] Employee Stock Purchase Plan (ESPP) Employee Stock [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 Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding - beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding - end of period (in shares) Weighted- Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Outstanding - beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars 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 Vested (in dollars 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 Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding - end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Equity instruments other than options, vested in period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Discount rate to the closing price, offering period Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date Discount rate to the closing price, purchase date Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date Maximum amount of common shares purchased under ESPP of employee's base salary, percent Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Cap amount for shares purchased per employee Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee, Value Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee, Value ESPP compensation expense Employee Stock Ownership Plan (ESOP), Compensation Expense Allocated share-based compensation expense Allocated Share-based Compensation Expense Tax benefit from compensation expense Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Total compensation cost not yet recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Total compensation cost not yet recognized, period for recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Goodwill and Intangible Assets Disclosure [Abstract] Goodwill, Intangible Assets, and Servicing Assets Intangible Assets Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Leases [Abstract] Operating lease cost Operating Lease, Cost Short term lease cost Short-term Lease, Cost Variable lease cost Variable Lease, Cost Sublease income Sublease Income Net lease cost Lease, Cost Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate lock commitments Interest Rate Lock Commitments [Member] Forward sale contracts related to mortgage banking Forward Contracts [Member] Position [Axis] Position [Axis] Position [Domain] Position [Domain] Short Short [Member] Derivative [Line Items] Derivative [Line Items] Notional amount, derivative asset Derivative Asset, Notional Amount Fair value, derivative asset Derivative Asset, Fair Value, Gross Asset Notional amount, derivative liability Derivative Liability, Notional Amount Fair value, derivative liability Derivative Liability, Fair Value, Gross Liability Revenue from Contract with Customer [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Noninterest Bearing Deposits Noninterest Bearing Deposits [Member] Interest-bearing Deposits Interest-bearing Deposits [Member] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Monthly service charges Monthly Service Charges [Member] Monthly Service Charges [Member] Customer analysis charges Customer Analysis Charges [Member] Customer Analysis Charges [Member] NSF charges NSF Charges [Member] NSF Charges [Member] Other service charges Other Service Charges [Member] Other Service Charges [Member] Wire transfer fees Wire Transfer Fees [Member] Wire Transfer Fees [Member] Foreign exchange fees Foreign Exchange Fees [Member] Foreign Exchange Fees [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Service fees on deposit accounts Fees and Commissions, Depositor Accounts Wire transfer fees Wire transfer fees Wire Transfer Fees Investments, Debt and Equity Securities [Abstract] Investment [Table] Investment [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Retained earnings Retained Earnings [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Mutual funds Mutual Fund [Member] Equity stock in other institutions Equity Securities [Member] Correspondent bank stock Correspondent Bank Stock [Member] Correspondent Bank Stock [Member] Community development financial institutions Community Development Financial Institutions [Member] Community Development Financial Institutions [Member] Community reinvestment act investments Community Reinvestment Act Investments [Member] Community Reinvestment Act Investments [Member] Investment [Line Items] Investment [Line Items] Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 Cumulative Effect of New Accounting Principle in Period of Adoption Equity investments with readily determinable fair value Marketable Securities, Equity Securities Equity investments without readily determinable fair values Equity Securities Without Readily Determinable Fair Value, Amount Equity Securities Without Readily Determinable Fair Value, Amount Equity investments without readily determinable fair values, impairment Equity Securities Without Readily Determinable Fair Value, Impairment Loss, Annual Amount Equity Securities Without Readily Determinable Fair Value, Impairment Loss, Annual Amount Equity investments without readily determinable fair values, observable price changes Equity Securities without Readily Determinable Fair Value, Upward (Downward) Price Adjustment, Annual Amount Equity Securities without Readily Determinable Fair Value, Upward (Downward) Price Adjustment, Annual Amount Schedule Of Change In Fair Value For Equity Investment Securities Schedule Of Change In Fair Value For Equity Investment Securities [Table Text Block] Schedule Of Change In Fair Value For Equity Investment Securities [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] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Municipal securities Municipal Bonds [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] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total losses included in other comprehensive income (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Ending Balance Income Tax Disclosure [Abstract] Income tax provision Income Tax Expense (Benefit) Pretax income Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Unrecognized tax benefits Unrecognized Tax Benefits Interest accrued Income Tax Examination, Interest Accrued Penalties accrued Income Tax Examination, Penalties Accrued Decrease in unrecognized tax benefits is reasonably possible Decrease in Unrecognized Tax Benefits is Reasonably Possible Banking and Thrift [Abstract] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Capital Units by Class [Axis] Capital Units by Class [Axis] Capital Unit, Class [Domain] Capital Unit, Class [Domain] Common Equity Tier 1 Common Equity Tier 1 [Member] Common Equity Tier 1 [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Company Parent Company [Member] Bank Subsidiaries [Member] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Common Equity Tier One Capital Common Equity Tier One Capital Common Equity Tier One Capital Ratio Common Equity Tier One Capital Ratio Total capital (to risk-weighted assets), Amount Capital [Abstract] Total Capital, Actual Capital Total Capital, Required For Capital Adequacy Purposes Capital Required for Capital Adequacy Required for Capital Adequacy with Capital Buffer Required for Capital Adequacy with Capital Buffer Required for Capital Adequacy with Capital Buffer Required To Be Well Capitalized under Prompt Corrective Action Provisions Capital Required to be Well Capitalized Tier I capital (to risk-weighted assets), Amount Tier One Risk Based Capital [Abstract] Tier I Capital, Actual (Risk Based) Tier One Risk Based Capital Tier I Capital, Required For Capital Adequacy Purposes Tier One Risk Based Capital Required for Capital Adequacy Tier 1 Capital, Required for Capital Adequacy with Capital Buffer Tier One Required for Capital Adequacy with Capital Buffer Tier One Required for Capital Adequacy with Capital Buffer Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based) Tier One Risk Based Capital Required to be Well Capitalized Tier I capital (to average assets), Amount Tier One Leverage Capital [Abstract] Tier I Capital, Actual (Leverage) Tier One Leverage Capital Tier I Capital, Required For Capital Adequacy Purposes Tier One Leverage Capital Required for Capital Adequacy Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage) Tier One Leverage Capital Required to be Well Capitalized Total capital and Tier I capital (to risk-weighted assets), Ratio Risk Based Ratios [Abstract] Total Capital (to Risk Weighted Assets), Actual Capital to Risk Weighted Assets Total Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes Capital Required for Capital Adequacy to Risk Weighted Assets Total Capital (to Risk Weighted assets), Minimum Required for Capital Adequacy with Capital Buffer Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets Total Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions Capital Required to be Well Capitalized to Risk Weighted Assets Tier I Capital (to Risk Weighted Assets), Actual (Risk Based) Tier One Risk Based Capital to Risk Weighted Assets Tier I Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes (Risk Based) Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 Capital (to Risk Weighted Assets), Minimum Required for Capital Adequacy with Capital Buffer Tier One Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets Tier One Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets Common Equity Tier One Capital Required to be Well-Capitalized Common Equity Tier One Capital Required to be Well-Capitalized Tier I Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based) Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Tier I capital (to average assets), Ratio Leverage Ratios [Abstract] Tier I Capital (to Average Assets), Actual (Leverage) Tier One Leverage Capital to Average Assets Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage) Tier One Leverage Capital Required for Capital Adequacy to Average Assets Tier I Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage) Tier One Leverage Capital Required to be Well Capitalized to Average Assets Receivables [Abstract] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Loan Sub Segment Grouping Type [Axis] Loan Sub Segment Grouping Type [Axis] Loan Sub Segment Grouping Type [Axis] Loan Sub Segment Grouping Type [Domain] Loan Sub Segment Grouping Type [Domain] Loan Sub Segment Grouping Type [Domain] Legacy Loans Legacy Receivables [Member] Legacy Receivables [Member] Acquired Loans Acquired Receivables [Member] Acquired Receivables [Member] Class of Financing Receivable [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable, Type [Domain] Real estate Real Estate Portfolio Segment [Member] Real Estate Portfolio Segment [Member] Commercial business Commercial Portfolio Segment [Member] Trade finance Trade Finance Portfolio Segment [Member] Trade Finance Portfolio Segment [Member] Consumer and other Consumer Portfolio Segment [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Residential Residential Mortgage [Member] Commercial Real Estate Loan [Member] Construction Construction Loans [Member] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate, Property Type [Domain] Real Estate [Domain] Retail Retail Site [Member] Hotel & motel Hotel [Member] Gas station & car wash Real Estate Commercial Gas Station & Car Wash [Member] Real Estate Commercial Gas Station & Car Wash [Member] Mixed use Real Estate Commercial Mixed Use [Member] Real Estate Commercial Mixed Use [Member] Industrial & warehouse Real Estate Commercial Industrial & Warehouse [Member] Real Estate Commercial Industrial & Warehouse [Member] Other Other Property [Member] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Pass/Not Rated Pass/Not Rated [Member] Pass/Not Rated [Domain] Special Mention Special Mention [Member] Substandard Substandard [Member] Doubtful or Loss Doubtful [Member] Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Loans Financing Receivable, Gross Revenue Recognition Revenue from Contract with Customer [Text Block] Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] 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 Additions through originations of servicing assets Servicing Asset at Amortized Cost, Additions by Origination Servicing Asset at Amortized Cost, Additions by Origination Amortization Servicing Asset at Amortized Cost, Amortization Balance at end of period Principal balances of loans serviced for other institutions Servicing Liability at Amortized Cost, Balance SBA Servicing Assets: Weighted-average discount rate SBA Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate SBA Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate SBA Servicing Assets: Constant prepayment rate SBA Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed SBA Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed Mortgage Servicing Assets: Weighted-average discount rate Mortgage Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Mortgage Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Mortgage Servicing Assets: Constant prepayment rate Mortgage Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed Mortgage Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Mortgage Loans on Real Estate Mortgages [Member] Qualifying Loans Qualifying Loans [Member] Qualifying Loans [Member] Securities Investment Securities Investment [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Weighted Average Weighted Average [Member] Minimum Minimum [Member] Maximum Maximum [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Percent of assets Federal Home Loan Bank, Advances, Maximum Borrowing Capacity, Percent of Assets Federal Home Loan Bank, Advances, Maximum Borrowing Capacity, Percent of Assets Maximum borrowing capacity Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available Percent outstanding advances Federal Home Loan Bank Advances, Pledged Collateral, Percent Outstanding Advances Federal Home Loan Bank Advances, Pledged Collateral, Percent Outstanding Advances Unsecured credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pledged as collateral Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged FHLB advances Advances from Federal Home Loan Banks FHLB advances, interest rate Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End Unused funds Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds Federal funds purchased Federal Funds Purchased Percent of qualifying assets Federal Reserve Bank Maximum Borrowing Capacity, As Percent Of Outstanding Principal Balance Of Qualifying Assets Federal Reserve Bank Maximum Borrowing Capacity, As Percent Of Outstanding Principal Balance Of Qualifying Assets Asset balance used to determine maximum borrowing capacity from federal reserve bank Asset Balance Used To Determine Maximum Borrowing Capacity From Federal Reserve Bank Asset Balance Used To Determine Maximum Borrowing Capacity From Federal Reserve Bank Securities pledged as collateral Available-for-sale Securities Pledged as Collateral Total available borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Amount outstanding Long-term Line of Credit Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Weighted-average remaining lease term - operating leases Operating Lease, Weighted Average Remaining Lease Term Extension options, term of extension Lessee, Operating Lease, Option to Extend, Term of Extension Lessee, Operating Lease, Option to Extend, Term of Extension operating lease right-of-use assets Operating Lease, Right-of-Use Asset operating lease liabilities Operating Lease, Liability Short term operating lease liability Operating Lease, Liability, Current Long term operating lease liability Operating Lease, Liability, Noncurrent Number of leases extended Lessee, Operating Lease, Option to Extend, Number of Leases Extended Lessee, Operating Lease, Option to Extend, Number of Leases Extended Rent expense Operating Leases, Rent Expense Subordinated Debentures and Convertible Notes Subordinated Borrowings Disclosure [Text Block] Earnings Per Share [Abstract] Computation of basic and diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Summary of Net Lease Cost and Other Information Lease, Cost [Table Text Block] Summary of Maturity of Remaining Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Other Trade Finance And Other Portfolio Segment [Member] Trade Finance And Other Portfolio Segment [Member] Troubled Debt Restructuring Accrual or Nonaccrual Status [Axis] Troubled Debt Restructuring Accrual or Nonaccrual Status [Axis] Troubled Debt Restructuring Accrual or Nonaccrual Status [Axis] Troubled Debt Restructuring Accrual or Nonaccrual Status [Domain] Troubled Debt Restructuring Accrual or Nonaccrual Status [Domain] Troubled Debt Restructuring Accrual or Nonaccrual Status [Domain] TDR on accrual Troubled Debt Restructuring Accrual Status [Member] Troubled Debt Restructuring Accrual Status [Member] TDR on non-accrual Troubled Debt Restructuring Nonaccrual Status [Member] Troubled Debt Restructuring Nonaccrual Status [Member] Troubled Debt Restructuring Concession, Type [Axis] Troubled Debt Restructuring Concession, Type [Axis] Troubled Debt Restructuring Concession, Type [Axis] Troubled Debt Restructuring Concession, Type [Domain] Troubled Debt Restructuring Concession, Type [Domain] Troubled Debt Restructuring Concession, Type [Domain] Payment concession Troubled Debt Restructuring Concession, Type, Payment Concession [Member] Troubled Debt Restructuring Concession, Type, Payment Concession [Member] Maturity / amortization concession Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member] Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member] Rate concession Troubled Debt Restructuring Concession, Type, Rate Concession [Member] Troubled Debt Restructuring Concession, Type, Rate Concession [Member] Residential Real Estate Residential Real Estate [Member] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Temporary modifications, period of interest only payments Financing Receivable, Temporary Modifications, Period Of Interest Only Payments Financing Receivable, Temporary Modifications, Period Of Interest Only Payments Troubled debt restructured Financing Receivable, Modifications, Recorded Investment Number of modified contracts Financing Receivable, Modifications, Number of Contracts Troubled Debt Restructuring, By Loan Class Trouble Debt Restructuring By Loan Class [Abstract] Trouble Debt Restructuring By Loan Class [Abstract] Pre-Modification Financing Receivable, Modifications, Pre-Modification Recorded Investment Post-Modification Financing Receivable, Modifications, Post-Modification Recorded Investment Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default Troubled Debt Restructuring Loans, Modified And Subsequent Payment Default [Abstract] Troubled Debt Restructuring Loans, Modified And Subsequent Payment Default [Abstract] Number of Loans Financing Receivable, Modifications, Subsequent Default, Number of Contracts Balance Financing Receivable, Modifications, Subsequent Default, Recorded Investment Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Common stock Common Stock [Member] Additional paid-in capital Additional Paid-in Capital [Member] Treasury stock Treasury Stock [Member] Accumulated other comprehensive loss, net AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Stockholders' Equity Attributable to Parent Balance, shares Shares, Issued Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Issuance of shares pursuant to various stock plans, shares Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Cash dividends declared on common stock ($0.13 per share) Dividends, Common Stock, Cash Comprehensive income: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Net income Net Income (Loss) Attributable to Parent Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Repurchase of treasury stock, shares Balance Balance, shares 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] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Assets Measured at Fair Value on a Non-recurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Carrying Amounts and Estimated Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses and Impaired Loans, Qualitative and Quantitative Analysis [Table] Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses and Impaired Loans, Qualitative and Quantitative Analysis [Table] Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses and Impaired Loans, Qualitative and Quantitative Analysis [Table] Receivables Acquired with Deteriorated Credit Quality [Axis] Receivables Acquired with Deteriorated Credit Quality [Axis] Receivables Acquired with Deteriorated Credit Quality [Domain] Receivables Acquired with Deteriorated Credit Quality [Domain] Receivables Acquired with Deteriorated Credit Quality [Member] Receivables Acquired with Deteriorated Credit Quality [Member] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Financing Receivable, Net Financing Receivable, Net Loans by Portfolio Segment and Impairment Method [Abstract] Loans by Portfolio Segment and Impairment Method [Abstract] Loans by Portfolio Segment and Impairment Method [Abstract] Impaired loans (recorded investment) Impaired Financing Receivable, Gross Carrying Value Impaired Financing Receivable, Gross Carrying Value Specific allowance Impaired Financing Receivable, Related Allowance Specific allowance to impaired loans Loss Coverage Ratio, Impaired Loans Loss Coverage Ratio, Impaired Loans Other loans Non-impaired Financing Receivable with General Allowance, Unpaid Principal Balance Non-impaired Financing Receivable with General Allowance, Unpaid Principal Balance General allowance Non-impaired Financing Receivable, General Allowance Non-impaired Financing Receivable, General Allowance General allowance to other loans Loss Coverage Ratio, Non-impaired Loans Loss Coverage Ratio, Non-impaired Loans Total loans Total allowance for loan losses Financing Receivable, Allowance for Credit Losses Total allowance to total loans Loss Coverage Ratio, Total Loans Loss Coverage Ratio, Total Loans Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding - beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Outstanding - end of period (in shares) Weighted- Average Exercise Price Per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding - beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Outstanding - end of period (in dollars per share) 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] Options exercisable - end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Options exercisable, Weighted-Average Exercise Price Per Share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Outstanding, Weighted-Average Remaining Contractual Life (Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options exercisable, Weighted-Average Remaining Contractual Life (Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Outstanding, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options exercisable, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Equity [Abstract] Stockholders’ Equity Stockholders' Equity Note Disclosure [Text Block] Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Discount accretion, net of depreciation and amortization Depreciation, Amortization and Accretion, Net Stock-based compensation expense Share-based Compensation Provision for loan losses Provision for Loan and Lease Losses Credit for unfunded loan commitments Loans and Leases Receivable, Commitments, Provision For Loan Losses Loans and Leases Receivable, Commitments, Provision for Loan Losses Valuation adjustment of OREO Real Estate Owned, Valuation Allowance, Provision Net gains on sales of SBA and other loans Gain (Loss) on Sale of Loans and Leases Earnings on BOLI Payments for (Proceeds from) Life Insurance Policies Net change in fair value of derivatives Derivative, Gain (Loss) on Derivative, Net Net losses on sale and disposal of premises and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Net gains on sales of OREO Gains (Losses) on Sales of Other Real Estate Net change in fair value of equity investments with readily determinable fair value Gain (Loss) on Investments Losses on investments in affordable housing partnership Investments in affordable housing partnerships expenses Investments in affordable housing partnerships expenses Net change in deferred income taxes Increase (Decrease) in Deferred Income Taxes Proceeds from sales of loans held for sale Proceeds from Sale of Loans Held-for-sale Originations of loans held for sale Payments for Origination and Purchases of Loans Held-for-sale Originations of servicing assets Increase (Decrease) In Servicing Assets Increase (Decrease) In Servicing Assets Net change in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Net change in other assets Increase (Decrease) in Other Operating Assets Net change in accrued interest payable Increase (Decrease) in Interest Payable, Net Net 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] Purchases of interest bearing deposits in other financial institutions Proceeds from (Payments for) in Interest-bearing Deposits in Banks Redemption of interest bearing deposits in other financial institutions Payments for (Proceeds from) Other Investing Activities Purchase of securities available for sale Payments to Acquire Available-for-sale Securities Proceeds from matured, called, or paid-down securities available for sale Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from sales of other loans held for sale previously classified as held for investment Proceeds from Sale of Other Loans Held-for-sale Net change in loans receivable Payments for (Proceeds from) Loans and Leases Proceeds from sales of OREO Proceeds from Sale of Other Real Estate Purchase of FHLB stock Payments to Acquire Federal Home Loan Bank Stock Purchase of FHLB stock Proceeds from Sale of Federal Home Loan Bank Stock Redemption of FHLB stock Payments for (Proceeds from) Federal Home Loan Bank Stock Purchase of premises and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from BOLI death benefits Proceeds from Life Insurance Policy Investments in affordable housing partnerships Payments for Affordable Housing Programs Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Net change in deposits Increase (Decrease) in Deposits Proceeds from FHLB advances Proceeds from Federal Home Loan Bank Borrowings Repayment of FHLB advances Repayments of Federal Home Loan Bank Borrowings Repayment of federal funds purchased Increase (Decrease) in Federal Funds Purchased Proceeds from convertible notes, net of issuance fees Cash dividends paid on common stock Payments of Ordinary Dividends Taxes paid in net settlement of restricted stock Payments Related to Tax Withholding for Share-based Compensation Issuance of additional stock pursuant to various stock plans Proceeds from Issuance of Common Stock Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities NET CHANGE IN CASH AND CASH EQUIVALENTS Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents CASH AND CASH EQUIVALENTS, END OF PERIOD SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid, Net Income taxes paid Income Taxes Paid SUPPLEMENTAL DISCLOSURES OF NON-CASH ACTIVITIES Other Noncash Investing and Financing Items [Abstract] Transfer from loans receivable to OREO Real Estate Owned, Transfer to Real Estate Owned Transfer from loans receivable to loans held for sale Transfer of Portfolio Loans and Leases to Held-for-sale Transfer from loans held for sale to loans receivable Loans transferred to loans receivable from held for sale Loans transferred to loans receivable from held for sale Transfer of available for sale securities to equity investments with adoption of ASU 2016-01 Transfer of Investment From Available-for-Sale to Equity Method Transfer of Investment From Available-for-Sale to Equity Method Lease liabilities arising from obtaining right-of-use assets Lease Liabilities Arising from Obtaining Right-of-Use Assets Lease Liabilities Arising from Obtaining Right-of-Use Assets Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2/3 Fair Value Inputs, Level 2 And Level 3 [Member] Fair Value Inputs, Level 2 And Level 3 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Estimated Fair Value Estimate of Fair Value Measurement [Member] Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] Other investments Other Investments [Member] Estimated fair values of financial instruments Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Interest bearing deposits in other financial institutions Investments, Fair Value Disclosure Loans held for sale Loans Held-for-sale, Fair Value Disclosure Loans receivable—net Loans Receivable, Fair Value Disclosure FHLB stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Accrued interest receivable Accrued Interest Receivable Fair Value Disclosure Accrued Interest Receivable Fair Value Disclosure Servicing assets, net Servicing Assets, Fair Value Disclosure Servicing Assets, Fair Value Disclosure Customers’ liabilities on acceptances Due From Customer Acceptances Fair Value Disclosure Due From Customer Acceptances Fair Value Disclosure Financial Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Noninterest bearing deposits Non Interest Bearing Deposits, Fair Value Disclosure Non Interest Bearing Deposits, Fair Value Disclosure Saving and other interest bearing demand deposits Interest Bearing Deposits Fair Value Disclosure Interest Bearing Deposits Fair Value Disclosure Time deposits Time Deposits Fair Value Disclosure Time Deposits Fair Value Disclosure FHLB advances Federal Home Loan Bank Borrowings, Fair Value Disclosure Convertible notes, net Convertible Debt, Fair Value Disclosures Convertible debt Federal Funds Purchased, Fair Value Disclosure Subordinated debentures Subordinated Debt Obligations, Fair Value Disclosure Accrued interest payable Accrued Interest Payable Fair Value Disclosure Accrued Interest Payable Fair Value Disclosure Acceptances outstanding Bank Acceptances Executed and Outstanding Fair Value Disclosure Bank Acceptances Executed and Outstanding Fair Value Disclosure Earnings Per Share ("EPS") Earnings Per Share [Text Block] Basis Of Presentation [Abstract] Basis of presentation. New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Estimated number of operating leases that will be accounted for under ASU 2016-02 Estimated Number of Operating Leases Estimated Number of Operating Leases Operating lease right-of-use assets, net Operating lease liabilities Net change in fair value recorded during the period on equity investments with readily determinable fair value Unrealized Gain (Loss) on Securities Net change in fair value recorded on equity investments sold during the period Gain (Loss) on Sale of Equity Investments Net change in fair value on equity investments with readily determinable fair values Marketable Securities, Unrealized Gain (Loss) Deposits Deposit Liabilities Disclosures [Text Block] Cash paid for amounts included in the measurement of lease liabilities: Cash Flow, Operating Activities, Lessee [Abstract] Operating cash flows from operating leases Operating Lease, Payments Right-of-use assets obtained in exchange for lease liabilities, net Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Weighted-average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent 2019 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five 2024 and thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Total lease obligations Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Center Financial acquisition Center Financial Corporation [Member] Center Financial Corporation [Member] Pacific International Bank acquisition Pacific International Bancorp, Inc. [Member] Pacific International Bancorp, Inc. [Member] Foster Bankshares acquisition Foster Bankshares Inc [Member] Foster Bankshares Inc [Member] Wilshire Bancorp acquisition Wilshire Bancorp, Inc [Member] Wilshire Bancorp, Inc [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] Core Deposits Core Deposits [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Goodwill Goodwill Goodwill impairment Goodwill, Impairment Loss Amortization expense related to core deposit intangible assets Amortization of Intangible Assets Amortization Period Finite-Lived Intangible Asset, Useful Life Gross Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Carrying Amount Finite-Lived Intangible Assets, Net Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Allowance for Loan Losses and the Loans Receivables by Impairment Methodology Allowance for Loan Losses by Portfolio Segment Allowance for Loan and Lease Losses [Roll Forward] Balance, beginning of period Provision (credit) for loan losses Provision for Loan, Lease, and Other Losses Loans charged off Financing Receivable, Allowance for Credit Losses, Write-downs Recoveries of charge offs Financing Receivable, Allowance for Credit Losses, Recovery PCI allowance adjustment Financing Receivable, Allowance for Credit Losses, Adjustments Adjustments made to allowance for credit losses related to financing receivables. Balance, end of period Allowance for loan losses - Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Allowance for loan losses - Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Allowance for loan losses - Total Loans outstanding - Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Loans outstanding - Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Loans outstanding - PCI loans Finance Receivable, Purchased Credit Impaired Loans with Subsequent Credit Deterioration Purchased credit impaired loans that had credit deterioration subsequent to acquisition. Loans outstanding - Total Organization, Consolidation and Presentation of Financial Statements [Abstract] Hope Bancorp, Inc. Nature of Operations [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Loans Receivable and Allowance for Loan Losses Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Asset Class [Axis] Asset Class [Axis] Fair Value by Asset Class [Domain] Asset Class [Domain] Accounts Receivable Accounts Receivable [Member] Inventories Inventories [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring basis Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Collateralized mortgage obligations Collateralized Mortgage Obligations [Member] Residential Residential Mortgage Backed Securities [Member] Commercial Commercial Mortgage Backed Securities [Member] Corporate securities Corporate Debt Securities [Member] Equity investments Equity investments with readily determinable fair value Mutual Funds, GSE Mortgage Related Securities [Member] Mutual Funds, GSE Mortgage Related Securities [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] Costs to sell percentage Fair Value Inputs, Costs To Sell Percentage Fair Value Inputs, Costs To Sell Percentage Assets: Assets, Fair Value Disclosure [Abstract] Securities available for sale, at fair value Available-for-sale Securities Interest rate swaps Derivative Asset Mortgage banking derivatives Mortgage Banking Derivative Assets, at Fair Value Mortgage Banking Derivative Assets, at Fair Value Liabilities: Liabilities, Fair Value Disclosure [Abstract] Interest rate swaps Derivative Liability Mortgage banking derivatives Mortgage Banking Derivative Liabilities, at Fair Value Mortgage Banking Derivative Liabilities, at Fair Value Available-for-sale Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Mutual funds Non-US Government and Agency Securities Non-US Government and Agency Securities [Member] Non-US Government and Agency Securities [Member] Debt Security Category [Axis] Debt Security Category [Axis] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Available-for-sale Securities Available-for-sale Securities [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Credit concentration risk Credit Concentration Risk [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Stockholders' equity Stockholders' Equity, Total [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Estimated Fair Value Maximum exposure to any single issuer Concentration Risk, Percentage Unrealized losses on securities Accumulated Other Comprehensive Income (Loss), Net of Tax Reclassifications out of accumulated other comprehensive (loss) income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Summary of Loans Receivable by Major Category Loans And Leases Outstanding [Table Text Block] Loans And Leases Outstanding [Table Text Block] Loans and Leases Acquired, Accretable Yield Movement Schedule Acquired Loans And Leases, Accretable Yield Movement Schedule [Table Text Block] Acquired Loans And Leases, Accretable Yield Movement Schedule [Table Text Block] Allowance for Loan Losses by Portfolio Segment Allowance for Credit Losses on Financing Receivables [Table Text Block] Impaired Financing Receivables Impaired Financing Receivables [Table Text Block] Aging of Past Due Loans Past Due Financing Receivables [Table Text Block] Risk Category of Loans by Class of Loans Financing Receivable Credit Quality Indicators [Table Text Block] Loans Sold From Loans Held For Investment Sales From Held For Investment Loans [Table Text Block] Sales From Held For Investment Loans [Table Text Block] Allowance for Loan Losses and Impaired Loans, Qualitative and Quantitative Analysis Allowance for Loan Losses and Impaired Loans, Qualitative and Quantitative Analysis [Table Text Block] Allowance for Loan Losses and Impaired Loans, Qualitative and Quantitative Analysis [Table Text Block] Troubled Debt Restructurings Troubled Debt Restructurings on Financing Receivables [Table Text Block] Summary of Troubled Debt Restructurings with Subsequent Payment Default Summary of Troubled Debt Restructurings with Subsequent Payment Default [Table Text Block] Summary of Troubled Debt Restructurings with Subsequent Payment Default [Table Text Block] Consumer OREO Other real estate owned [Member] Other real estate owned Non-recurring basis Fair Value, Measurements, Nonrecurring [Member] Change during period Changes Measurement [Member] Total gains (losses), fair value Total Gains Losses Fair Value Disclosure Total Gains Losses Fair Value Disclosure 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 options and restricted shares Stock Options And Restricted Shares [Member] Stock Options And Restricted Shares [Member] Warrants Warrant [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive shares of common stock Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Share repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Net Income (Numerator) Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Basic EPS - common stock Diluted EPS - common stock Net Income (Loss) Available to Common Stockholders, Diluted Weighted-Average Shares (Denominator) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic EPS - common stock (in shares) Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Stock options, restricted stock, and ESPP shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Diluted EPS - common stock (shares) Weighted Average Number of Shares Outstanding, Diluted Earnings Per Share Earnings Per Share, Basic and Diluted [Abstract] Basic EPS - common stock (in dollars per share) Earnings Per Share, Basic Diluted EPS - common stock (in dollars per share) Earnings Per Share, Diluted Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Servicing Assets Servicing Asset at Amortized Cost [Table Text Block] Summary of Fair Value Inputs Fair Value Inputs, Assets, Quantitative Information [Table Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Cash and cash equivalents: Cash and Cash Equivalents [Abstract] Cash and due from banks Cash and Due from Banks Interest bearing cash in other banks Interest-bearing Deposits in Banks and Other Financial Institutions Total cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Interest bearing deposits in other financial institutions Other Investments Equity investments Loans held for sale, at the lower of cost or fair value Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Loans receivable, net of allowance for loan losses of $94,217 and $92,557 at March 31, 2019 and December 31, 2018, respectively Loans Receivable, Net Other real estate owned (“OREO”), net Other Real Estate Federal Home Loan Bank (“FHLB”) stock, at cost Federal Home Loan Bank Stock Premises and equipment, net Property, Plant and Equipment, Net Accrued interest receivable Interest Receivable Deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance Customers’ liabilities on acceptances Due from Customer Acceptances Bank owned life insurance (“BOLI”) Bank Owned Life Insurance Investments in affordable housing partnerships Investments in Affordable Housing Partnerships Investments in affordable housing partnerships. Core deposit intangible assets, net Intangible Assets, Net (Excluding Goodwill) Servicing assets, net Servicing Asset Other assets 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 [Abstract] Money market and NOW accounts Deposits, Money Market Deposits and Negotiable Order of Withdrawal (NOW) Savings deposits Deposits, Savings Deposits Time deposits Time Deposits Total deposits Deposits FHLB advances Long-term Federal Home Loan Bank Advances Convertible notes, net Convertible Notes Payable Subordinated debentures Subordinated Debt Accrued interest payable Interest Payable Acceptances outstanding Bank Acceptances Executed and Outstanding Commitments to fund investments in affordable housing partnerships Qualified Affordable Housing Project Investments, Commitment Other liabilities Other Liabilities Total liabilities Liabilities STOCKHOLDERS’ EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.001 par value; authorized 150,000,000 shares at March 31, 2019 and December 31, 2018: issued and outstanding 135,638,037 and 126,635,584 shares, respectively, at March 31, 2019, and issued and outstanding 135,642,365 and 126,639,912 shares, respectively, at December 31, 2018 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Treasury stock, at cost; 9,002,453 shares at March 31, 2019 and December 31, 2018 Treasury Stock, Value Accumulated other comprehensive loss, net Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Balance at beginning of period Unrealized loss on securities available for sale and interest only strips Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax Tax effect Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Total other comprehensive (loss) income Reclassification to retained earnings per ASU 2016-01 Reclassification From Aoci To Retained Earnings Due To New Accounting Standard Reclassification From Aoci To Retained Earnings Due To New Accounting Standard Balance at end of period Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Borrowings Debt Disclosure [Text Block] Commitments Supply Commitment [Table Text Block] Equity Investment Securities Marketable Securities [Table Text Block] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Securities Available for Sale Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Real estate loans Trade finance Assets Assets, Fair Value Disclosure 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 Total Nara Capital Trust III Nara Capital Trust III [Member] Nara Capital Trust III [Member] Nara Statutory Trust IV Nara Statutory Trust IV [Member] Nara Statutory Trust IV [Member] Nara Statutory Trust V Nara Statutory Trust V [Member] Nara Statutory Trust V [Member] Nara Statutory Trust VI Nara Statutory Trust VI [Member] Nara Statutory Trust VI [Member] Center Capital Trust I Center Capital Trust I [Member] Center Capital Trust I [Member] Wilshire Trust II Wilshire Statutory Trust II [Member] Wilshire Statutory Trust II [Member] Wilshire Trust III Wilshire Statutory Trust III [Member] Wilshire Statutory Trust III [Member] Wilshire Trust IV Wilshire Statutory Trust IV [Member] Wilshire Statutory Trust IV [Member] Saehan Capital Trust I Saehan Capital Trust I [Member] Saehan Capital Trust I [Member] Trust Preferred Security Amount Carrying Value of Debentures Junior Subordinated Debt [Member] Trust Preferred Security Amount Carrying Value of Debentures Current Rate Supply Commitment [Table] Supply Commitment [Table] Supply Commitment [Axis] Supply Commitment [Axis] Supply Commitment Arrangement [Domain] Supply Commitment Arrangement [Domain] Commitments to extend credit Commitments to Extend Credit [Member] Standby letters of credit Standby Letters of Credit [Member] Other letters of credit Letter of Credit [Member] Commitments to fund investments in affordable housing partnerships Low Income Housing Tax Credit [Member] Low Income Housing Tax Credit [Member] Forward sale commitments Supply Commitment [Line Items] Supply Commitment [Line Items] Commitments and letters of credit Supply Commitment, Remaining Minimum Amount Committed Notional amount Derivative, Notional Amount Operating lease commitments Operating Leases, Future Minimum Payments Due Loss contingencies for all legal claims Loss Contingency Accrual Income Taxes Income Tax Disclosure [Text Block] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Balance at beginning of period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Accretion Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Reclassification from nonaccretable difference Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference Balance at end of period Loans receivable, allowance Loans and Leases Receivable, Allowance Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Treasury stock, at cost, shares repurchased Treasury Stock, Shares 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] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Nonaccrual loans Financing Receivable, Recorded Investment, Nonaccrual Status Accruing loans past due 90 or more days Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Guaranteed portion of delinquent SBA loans excluded from Nonaccrual loans Small Business Administration Loans In Liquidation Excluded From Nonaccrual Loans Small Business Administration Loans In Liquidation Excluded From Nonaccrual Loans Past due loans Financing Receivable, Recorded Investment, Past Due Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Income Statement [Abstract] INTEREST INCOME: Interest and Dividend Income, Operating [Abstract] Interest and fees on loans Interest and Fee Income, Loans and Leases Interest on securities Interest and Dividend Income, Securities, Operating Interest on other investments Interest Income, Other Total interest income Interest and Dividend Income, Operating INTEREST EXPENSE: Interest Expense [Abstract] Interest on deposits Interest Expense, Deposits Interest on FHLB advances Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Long-term Interest on other borrowings and convertible notes Interest Expense, Other Long-term Debt Total interest expense Interest Expense NET INTEREST INCOME BEFORE PROVISION FOR LOAN LOSSES 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] International service fees International service fees International Service Fees Loan servicing fees, net Bank Servicing Fees Net gains on sales of SBA loans Gain (Loss) on Sales of Loans, Net Net gains on sales of other loans Gain (Loss) on Sale of Other Loans and Leases Other income and fees Noninterest Income, Other Total noninterest income Noninterest Income NONINTEREST EXPENSE: Noninterest Expense [Abstract] Salaries and employee benefits Labor and Related Expense Occupancy Occupancy, Net Furniture and equipment Equipment Expense Advertising and marketing Marketing and Advertising Expense Data processing and communications Communications and Information Technology Professional fees Professional Fees Investments in affordable housing partnerships expenses Loss on Investments in Affordable Housing Partnership Loss on Investments in Affordable Housing Partnership FDIC assessments Federal Deposit Insurance Corporation Premium Expense Credit related expenses Expense Related to Distribution or Servicing and Underwriting Fees OREO expense, net Other Real Estate Expense Other Real Estate Expense Other Other Noninterest Expense Total noninterest expense Noninterest Expense INCOME BEFORE INCOME TAXES INCOME TAX PROVISION NET INCOME EARNINGS PER COMMON SHARE Basic (in dollars per share) Diluted (in dollars per share) Gross Carrying Amount Debt Instrument, Convertible, Gross Carrying Amount [Abstract] Debt Instrument, Convertible, Gross Carrying Amount [Abstract] Convertible notes principal balance Long-term Debt, Gross Discount Debt Instrument, Unamortized Discount, Gross Debt Instrument, Unamortized Discount, Gross Issuance costs to be capitalized Debt Issuance Costs, Gross Carrying balance of convertible notes Long-term Debt, Net of Discount and Issuance Costs, Gross Long-term Debt, Net of Discount and Issuance Costs, Gross