Origination Date 2025 Origination Date 2024 [Member] Origination Date 2024 Total gross loans and leases HFI Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process Accumulated Amortization, beginning of period Accumulated Amortization, end of period Finite-Lived Intangible Assets, Accumulated Amortization Proceeds From Mortgage Servicing Rights Sale Proceeds From Mortgage Servicing Rights Sale Proceeds From Mortgage Servicing Rights Sale Award Timing Predetermined Award Timing Predetermined [Flag] Two Thousand Six One Term Debt Securitization Two Thousand Six One Term Debt Securitization [Member] Two thousand six, one term debt securitization. Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Standard & Poor's, AA- Rating Standard & Poor's, AA- Rating [Member] Recently Issued Accounting Standards Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Allowance for Credit Losses, Charge-offs Allowance for Credit Losses, Charge-offs Financing Receivable, Allowance for Credit Loss, Writeoff Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Trust Preferred Securities Two Thousand Six Series Three Trust Preferred Securities Two Thousand Six Series Three [Member] Trust Preferred Securities Two Thousand Six Series Three. Standby letters of credit Guarantor Obligations, Maximum Exposure, Undiscounted Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Debt Securities, Held-to-maturity, Maturity [Abstract] Debt Securities, Held-to-Maturity, Maturity [Abstract] Preferred stock dividends paid Payments of Ordinary Dividends, Preferred Stock and Preference Stock Term Loan Origination Date [Domain] Term Loan Origination Date [Domain] [Domain] for Term Loan Origination Date [Axis] 1-2 High Pass [Member] 1-2 High Pass [Member] 1-2 High Pass [Member] Interest rate caps Interest Rate Cap [Member] Adjustment to Compensation, Amount Adjustment to Compensation Amount Percentage of nonaccrual loans and leases Concentration Risk, Percentage Decrease in other assets Increase (Decrease) in Other Operating Assets Interest receivable Interest and fees receivable income Interest and fees receivable income earned but not yet collected Earned stock compensation Share-Based Payment Arrangement, Noncash Expense Derivative Asset, Notional Amount Derivative Asset, Notional Amount Employee Stock Option Share-Based Payment Arrangement, Option [Member] Total loans and leases HFI, net Loans and leases, net Financing Receivable, after Allowance for Credit Loss Year-to-date Year-to-Date [Member] Year-to-Date Deferred tax asset, net Deferred Tax Assets, Tax Deferred Expense Income tax (expense) benefit related to unrealized gain on cash flow hedges arising during the period Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Total stockholders' equity Beginning Period Balance Ending Period Balance Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale [Table] Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Common Stock, Shares Authorized Common Stock, Shares Authorized Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Reclassification, Type [Domain] Reclassification, Type [Domain] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Cash Flow Hedge Derivative Instrument Assets at Fair Value Cash Flow Hedge Derivative Instrument Assets at Fair Value Cover [Abstract] Cover [Abstract] CDI and CRI Amortization CDI and CRI Amortization CDI and CRI Amortization Dividends and Gains (Losses) on Equity Investments Dividends and Gains (Losses) on Equity Investments Dividends and Gains (Losses) on Equity Investments Maximum Maximum [Member] Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss, Total Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Loans transferred to foreclosed assets Real Estate Owned, Transfer to Real Estate Owned Net CDI and CRI, end of period Finite-Lived Intangible Assets, Net Debt Securities, Available-for-sale, Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Restricted Stock Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Subordinated debt Subordinated debt Subordinated Debentures Subordinated Debentures Not Part of Long-Term Liabilities External Credit Rating, Standard & Poor's [Domain] External Credit Rating, Standard & Poor's [Domain] Provision Type [Axis] Provision Type [Axis] Expiring provision Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Net losses (gains) on nonrecurring assets Net Losses (Gains) on Nonrecurring Assets [Table Text Block] Net Losses (Gains) on Nonrecurring Assets [Table Text Block] Deposits in financial institutions Interest Income, Deposits with Financial Institutions Financing Receivable, Modified, Weighted Average Term Increase from Modification Financing Receivable, Modified, Weighted Average Term Increase from Modification Earnings before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company PacWest 2018 Amended and Revised Stock Incentive Plan PacWest 2018 Amended and Revised Stock Incentive Plan [Member] PacWest 2017 Revised Stock Incentive Plan [Member] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Proceeds from borrowings Proceeds from Issuance of Debt Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Loan Modifications, Principal Forgiveness Loan Modifications, Principal Forgiveness Loan Modifications, Principal Forgiveness Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Lease payments receivable Direct Financing Lease, Lease Receivable Total interest expense Interest Expense, Operating Interest Expense, Operating Additional Paid-in Captial [Domain] Additional Paid-in Captial [Domain] Additional Paid-in Captial [Domain] 6-8 Classified [Member] 6-8 Classified [Member] 6-8 Classified [Member] Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate Individually evaluated Financing Receivable, Allowance for Credit Loss, Individually Evaluated Document Fiscal Period Focus Document Fiscal Period Focus Advance Number [Domain] Advance Number [Domain] Advance Number [Domain] Fair Value Option, Disclosures, Credit-linked Notes Fair Value Option, Disclosures [Table Text Block] Award Timing Method Award Timing Method [Text Block] Interest rate collars Interest Rate Collars [Member] Interest Rate Collars Service charges on deposit accounts Service charges on deposit accounts Fees and Commissions, Depositor Accounts1 Fees and Commissions, Depositor Accounts1 Subordinated Debt Trust CIII Due September 2035 Subordinated Debt Trust CIII Due September 2035 [Member] This element represents the subordinated debentures series Trust CIII, due September 2035. Subordinated debt has a lower priority of repayment in liquidation of the entity's assets. Award Type [Axis] Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Aggregate Unpaid Principal Balance in Excess of (Less Than) Fair Value Aggregate Unpaid Principal Balance in Excess of (Less Than) Fair Value Aggregate Unpaid Principal Balance in Excess of (Less Than) Fair Value Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Allowance For Credit Losses, Net charge-offs Financing Receivable, Allowance For Credit Losses, Net Charge-offs Financing Receivable, Allowance For Credit Losses, Net Charge-offs Deferred Discounts, Finance Charges and Interest Included in Receivables Deferred Discounts, Finance Charges and Interest Included in Receivables Non-taxable interest Interest Income, Securities, Operating, Tax Exempt Accrued interest payable and other liabilities Accrued Liabilities and Other Liabilities Entity Address, City or Town Entity Address, City or Town Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Unrealized gain (loss) on cash flow hedges arising during the period Unrealized Gain (Loss) on Price Risk Cash Flow Derivatives, before Tax Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Advance No. 6 Advance No. 6 [Member] Advance No. 6 Finance Receivable Investment And Interest Income, Nonaccrual Finance Receivable Investment And Interest Income, Nonaccrual [Table Text Block] Finance Receivable Investment And Interest Income, Nonaccrual [Table Text Block] Debt Securities, Held-to-maturity, Credit Quality Indicator Debt Securities, Held-to-Maturity, Credit Quality Indicator [Table Text Block] Subordinated Notes Due October 30, 2030 Subordinated Notes Due October 30, 2030 [Member] Subordinated Notes Due October 30, 2030 PMB CapitalTrust III PMB CapitalTrust III [Member] PMB CapitalTrust III Entity Emerging Growth Company Entity Emerging Growth Company Warranty Income Warranty Income [Member] Warranty Income Schedule of held-to-maturity securities reconciliation Debt Securities, Held-to-Maturity [Table Text Block] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Restricted Cash and Cash Equivalent Restricted Cash and Cash Equivalent Restricted Stock-Based Compensation Restricted Stock-Based Compensation [Member] Restricted Stock-Based Compensation Net Carrying Amount Debt Securities, Available-for-Sale, Net Carrying Amount Debt Securities, Available-for-Sale, Net Carrying Amount Term Loan Origination Date [Axis] Term Loan Origination Date [Axis] Term Loan Origination Date [Axis] The ending balance of the loan and lease portfolio is composed of loans and leases: Financing Receivable, Allowance for Credit Loss, Additional Information, Portfolio Composition [Abstract] Financing Receivable, Allowance for Credit Loss, Additional Information, Portfolio Composition [Abstract] Total noninterest income Noninterest Income Common stock, outstanding (in shares) Common Stock, Shares, Outstanding Conversion of Stock, Shares Issued Conversion of Stock, Shares Issued Amount of the allowance applicable to loans and leases: Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Time Period [Axis] Time Period [Axis] Time Period Loan Restructuring and Refinancing Concession Type [Axis] Loan Restructuring and Refinancing Concession Type [Axis] Loan Restructuring and Refinancing Concession Type Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Held-to-Maturity Investments Classified by Contractual Maturity Date Held-to-Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Held-to-Maturity Investments Classified by Contractual Maturity Date Loans and Leases Held for Investment Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Noninterest expense: Noninterest Expense [Abstract] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Subordinated Debt Trust V Due September 2033 Subordinated Debt Trust V Due September 2033 [Member] This element represents the subordinated debentures series Trust V due September 2033. Subordinated debt has a lower priority of repayment in liquidation of the entity's assets. 2030 Sales-Type and Direct Financing Leases, Payment to be Received, Rolling Year Five Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Investment securities Interest and Dividend Income, Securities, Operating Equity warrants Equity Warrants Equity Warrants Information technology and data processing Income Tax Expense (Benefit) Rate Index (Quarterly Reset) Debt Instrument, Basis Spread on Variable Rate Other assets Other assets Other Assets Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Preferred stock issued (shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Unrealized gain (loss) on cash flow hedges, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One NonPCI and PCI Loans NonPCI and PCI Loans [Member] NonPCI and PCI Loans [Member] Advance No. 1 Advance No. 1 [Member] Advance No. 1 Federal Reserve Bank Advances Branch of Federal Reserve [Domain] Federal Reserve Bank Advances Branch of Federal Reserve [Domain] Federal Reserve Bank Advances Branch of Federal Reserve [Domain] Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank Branch [Domain] Amortization of operating lease ROU assets Operating Lease, Right-of-Use Asset, Periodic Reduction Leased equipment depreciation Lease Equipment Depreciation Lease Equipment Depreciation Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Extended Maturity, Payment Delay and Principal Forgiveness Extended Maturity, Payment Delay and Principal Forgiveness [Member] Extended Maturity, Payment Delay and Principal Forgiveness Proceeds from Issuance of Private Placement Proceeds from Issuance of Private Placement Unused Lines of Credit Unused lines of Credit [Member] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Highest Rate of Spread Highest Rate of Spread [Member] Highest Rate of Spread Other Commercial Other Commercial [Member] Other Commercial [Member] Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Other income Noninterest Income, Other Operating Income Unvested restricted shares (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Investment in FHLB stock, Fair Value Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Changes in Fair Value - Other Comprehensive Income Changes in Fair Value - Other Comprehensive Income Changes in Fair Value - Other Comprehensive Income Net Earnings Reallocation of Net Earnings Net Earnings Reallocation for Voting Common Stock Net Earnings Reallocation for Voting Common Stock Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation LIHTC investments Low Income Housing Tax Credit - LIHTC Low Income Housing Tax Credit - LIHTC Subsequent Event Subsequent Event [Member] Investor with Common Stock [Axis] Investor with Common Stock [Axis] Investor with Common Stock Allowance for Credit Losses, Recoveries Financing Receivable, Allowance for Credit Loss, Recovery Net interest income Interest Income (Expense), Operating Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Denomination value Liability, Reporting Currency Denominated, Value PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Private Capital Private Capital [Member] Private Capital Direct Financing Lease, Interest Income Direct Financing Lease, Interest Income Equity Components [Axis] Equity Components [Axis] Sublease income Sublease Income Loans and Leases Receivable Disclosure [Table] Loans and Leases Receivable Disclosure [Table] Standby Letters of Credit Standby Letters of Credit [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Advance No. 2 Advance No. 2 [Member] Advance No. 2 Number of reportable segments Number of Reportable Segments Total Net Gain (Loss) from Nonrecurring Assets Total Net Gain (Loss) from Nonrecurring Assets Total Net Gain (Loss) from Nonrecurring Assets Non Purchased Credit Impaired Loans and Leases Non Purchased Credit Impaired Loans and Leases [Member] Represents information pertaining to loans and leases that were not impaired at the time of purchase. These assets are not accounted for under Accounting Standard Codification Topic 310-30. Commercial Commercial Real Estate [Member] Entity Address, State or Province Entity Address, State or Province Total interest income Total interest income Interest and Dividend Income, Operating Operating lease, impairment loss Operating Lease, Impairment Loss Special Mention Special Mention [Member] Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Servicing Asset Servicing Asset Loans Receivable HFI, Fair Value Disclosure Loans Receivable, Fair Value Disclosure Commercial Collateralized Financing Receivable Loan Type [Domain] Commercial Collateralized Financing Receivable Loan Type [Domain] [Domain] for Commercial Collateralized Financing Receivable Loan Type [Axis] Individual: Individual [Axis] Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract] Common stock dividends paid Payments of Ordinary Dividends, Common Stock Financing Receivable, Allowance for Receivable Charge-offs and Recoveries [Table] Financing Receivable, Allowance for Receivable Charge-offs and Recoveries [Table] Financing Receivable, Allowance for Receivable Charge-offs and Recoveries Combination Term Extension, Rate Reduction and Payment Delay Combination Term Extension, Rate Reduction and Payment Delay [Member] Combination Term Extension, Rate Reduction and Payment Delay Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Common Stock, Warrants Issued, Per Share Price Common Stock, Warrants Issued, Per Share Price Common Stock, Warrants Issued, Per Share Price Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Modified [Line Items] Subordinated Debt Trust CII Due September 2033 Subordinated Debt Trust CII Due September 2033 [Member] This element represents the subordinated debentures series Trust CII due September 2033. Subordinated debt has a lower priority of repayment in liquidation of the entity's assets. Loss on sale of foreclosed assets Gains (Losses) on Sales of Other Real Estate Interest income: Interest and Dividend Income, Operating [Abstract] Held-to-maturity Securities Held-to-Maturity Securities [Member] Total noninterest expense Noninterest Expense SBIC investments SBIC Investments SBIC Investments Commitments disclosure Long-Term Purchase Commitment [Table Text Block] Equity Stock Type [Domain] Equity Stock Type [Domain] Equity Stock Type [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Payment Deferral Payment Deferral [Member] Deposits Interest Expense, Deposits Noninterest income: Noninterest Income [Abstract] Schedule of Payments to be Received on Operating Leases Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Other receivables/assets Other Assets, Miscellaneous Warburg Investors Warburg Investors [Member] Warburg Investors Entity Central Index Key Entity Central Index Key PEO Name PEO Name Revenues Revenues Net (decrease) increase in interest-bearing deposits Increase Decrease In Interest Bearing Domestic And Foreign Deposits Increase Decrease In Interest Bearing Domestic And Foreign Deposits Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] CV of loans held for investment by class by performing and nonperforming Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after One through Five Years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after One through Five Years Noninterest-bearing deposits Noninterest-Bearing Deposit Liabilities Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Conversion to Voting Common Shares Conversion to Voting Common Shares Conversion to Voting Common Shares Subordinated Borrowing [Line Items] Subordinated Borrowing [Line Items] Aggregate amortization expense 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Finance Receivable, Loan Modifications, Payment Status Finance Receivable, Loan Modifications, Payment Status [Table Text Block] Finance Receivable, Loan Modifications, Payment Status CDI and CRI Balance, beginning of period CDI and CRI Balance, end of period Finite-Lived Intangible Assets, Gross Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Decrease in accrued interest payable and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Investments [Domain] Investments [Domain] Leased equipment income Lease Equipment Income [Member] Lease Equipment Income [Member] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Origination Date 2026 Origination Date 2025 [Member] Origination Date 2025 Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Contract liabilities, which are included in "Accrued interest payable and other liabilities" Contract With Customer, Liabilities Reclassified to Other Assets Contract With Customer, Liabilities Reclassified to Other Assets Warrant income (loss) Proceeds from Warrant Exercises Net earnings (loss) allocated to common and equivalent shares Undistributed Earnings, Basic 2029 Sales-Type and Direct Financing Leases, Payment to be Received, Rolling Year Four Loan Restructuring and Refinancing Concession Type [Domain] Loan Restructuring and Refinancing Concession Type [Domain] Loan Restructuring and Refinancing Concession Type [Domain] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] NVCE Non-voting Share Class NVCE Non-voting Share Class [Member] NVCE Non-voting Share Class Compensation Labor and Related Expense Shares Repurchased Under Stock Repurchased Program, Including Excise Tax Shares Repurchased Under Stock Repurchased Program, Including Excise Tax Shares Repurchased Under Stock Repurchased Program, Including Excise Tax Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Private label commercial MBS Mortgage-Backed Securities, Issued by Private Enterprises [Member] Unrecognized share based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Entity Listings [Line Items] Entity Listings [Line Items] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Fair Value Hedge Assets Fair Value Hedge Assets Document Quarterly Report Document Quarterly Report Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Long-Term Debt, Fair Value Long-Term Debt, Fair Value Nonaccrual Loans And Leases Benchmark Nonaccrual Loans And Leases Benchmark [Member] Nonaccrual Loans And Leases Benchmark Fair value inputs, assets, quantitative information Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Sales-type and Direct Financing Leases, Lease Receivable, Maturity Sales-Type and Direct Financing Leases, Payment to be Received, Maturity [Table Text Block] Financing Receivable, Nonaccrual Financing Receivable, Nonaccrual [Table Text Block] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Real Estate Construction and Land Real Estate Construction [Member] Real Estate Construction. Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Investment Type [Axis] Investment Type [Axis] Total investment securities Investments Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Fair Value, Equity, Transfers to Level 1, Amount Fair Value, Equity, Transfers to Level 1, Amount Fair Value, Equity, Transfers to Level 1, Amount Interest rate and foreign exchange contracts Other derivative assets, Fair Value Derivative Asset, Fair Value of Collateral Non-voting common stock equivalents ($0.01 par value, 9,790,600 shares issued at March 31, 2025 and 9,790,600 shares issued at December 31, 2024) Non-voting Common Stock Equivalents Non-voting Common Stock Equivalents Current Current [Member] Current Non-PEO NEO Non-PEO NEO [Member] Letters of credit outstanding, amount Letters of Credit Outstanding, Amount Allowance for Credit Loss Allowance for Credit Loss Debt Securities, Available-for-Sale, Allowance for Credit Loss Pacific Western Bank Pacific Western Bank [Member] Pacific Western Bank [Member] Anti-dilutive Shares for Earnings Per Share [Axis] Anti-dilutive Shares for Earnings Per Share [Axis] Anti-dilutive Shares for Earnings Per Share Gain (Loss) on Hedging Activity Gain (Loss) on Hedging Activity Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Allowance for Credit Losses, Balance, beginning of period Allowance for Credit Losses, Balance, end of period Financing Receivable, Allowance for Credit Loss Award Type [Domain] Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Equity Awards Adjustments Equity Awards Adjustments [Member] Federal Home Loan Bank, Advance, Branch of FHLBank Federal Home Loan Bank, Advance, Branch of FHLBank [Table Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Securities available-for-sale, Carrying Amount Securities Available For Sale Including Covered Securities Securities Available For Sale Including Covered Securities Foreign exchange contracts Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] LOCOM HFS adjustment LOCOM HFS adjustment LOCOM HFS Adjustment LOCOM HFS Adjustment Stock Repurchase Plan - March 23, 2026 Stock Repurchase Plan - March 23, 2026 [Member] Stock Repurchase Plan - March 23, 2026 Performing Performing Financial Instruments [Member] Schedule of Investments [Line Items] Schedule of Investments [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] No Finance Receivable Allowance No Finance Receivable Allowance [Member] No Finance Receivable Allowance [Member] Other Assets Other Assets Disclosure [Text Block] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Accumulated other comprehensive loss, net Accumulated Other Comprehensive Income (Loss), Net of Tax Standard & Poor's, No Credit Rating Standard & Poor's, No Credit Rating [Member] Standard & Poor's, No Credit Rating Financial Instruments [Domain] Financial Instruments [Domain] Other comprehensive income, net of tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Performance Shares Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Additional Paid-in Captial [Axis] Additional Paid-in Captial [Axis] Additional Paid-in Captial Minimum Minimum [Member] Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Federal Reserve Bank Advances Federal Reserve Bank Advances [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name 30 TO 89 Days Past Due 30 To 89 Days Past Due [Member] 30 To 89 Days Past Due Income tax benefit (expense) related to change in fair value of credit-linked notes Income Tax Expense Related to Change In Fair Value of Credit-linked Notes Income Tax Expense Related to Change In Fair Value of Credit-linked Notes Total included in earnings Gain (Loss) on Sale of Investments Borrowings and Subordinated Debentures Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Advance due 07/30/2026 Advance due 07/30/2026 [Member] Advance due 07/30/2026 Operating cash flows from operating leases Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 Net earnings available to common and equivalent stockholders, diluted Net earnings (loss) available to common and equivalent stockholders, diluted Net Income (Loss) Available to Common Stockholders, Diluted Tax Period [Axis] Tax Period [Axis] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Weighted average diluted shares outstanding, diluted (usd per share) Weighted Average Number of Shares Outstanding, Diluted Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Collateral-dependent Finance Receivable Collateral-dependent Finance Receivable [Table Text Block] Collateral-dependent Finance Receivable [Table Text Block] Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current Stock Repurchase Plan - March 17, 2025 Stock Repurchase Plan - March 17, 2025 [Member] Stock Repurchase Plan - March 17, 2025 Proceeds from BOLI death benefit Proceeds from Life Insurance Policy Entity Small Business Entity Small Business Restricted Cash And Restricted Cash Equivalents Restricted Cash And Restricted Cash Equivalents Restricted Cash And Restricted Cash Equivalents Preferred stock outstanding (shares) Preferred Stock, Shares Outstanding Document Transition Report Document Transition Report Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Underlying Securities Award Underlying Securities Amount Advance No. 3 Advance No. 3 [Member] Advance No. 3 Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Less: weighted-average unvested restricted stock outstanding (shares) Weighted Average Number of Shares, Restricted Stock Weighted Average Number of Shares, Restricted Stock Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Short-term lease costs Short-Term Lease, Cost Available-for-sale Investments Classified by Contractual Maturity Date Available-for-sale Investments Classified by Contractual Maturity Date [Table Text Block] Available-for-sale Investments Classified by Contractual Maturity Date Stock repurchased (in dollars per share) Shares Acquired, Average Cost Per Share Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Reconciliation of Assets from Segment to Consolidated Reconciliation of Assets from Segment to Consolidated [Table Text Block] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] 30-89 Days Past Due Receivable, 30-89 days past due Financing Receivable Recorded Investment Thirty to Eighty Nine Days Past Due Financing receivable recorded investment 30 to 89 days past due. Service charges on deposit accounts Total revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Variable costs Variable Lease, Cost Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Axis] Less: Unearned income Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount Changes in Fair Value - Gains (Losses) Changes in Fair Value - Gains (Losses) Changes in Fair Value - Gains (Losses) Statistical Measurement [Axis] Statistical Measurement [Axis] Customer related expense Customer Related Expense Customer Related Expense Reserve for Unfunded Loan Commitments, Recoveries Reserve for Unfunded Loan Commitments, Recoveries Reserve for Unfunded Loan Commitments, Recoveries Common shares purchased under Dividend Reinvestment Plan Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan Share Repurchase Program, Authorized, Amount Share Repurchase Program, Authorized, Amount Reserve for Unfunded Commitments, Provision (negative provision) Reserve for Unfunded Commitments, Provision Reserve for Unfunded Commitments, Provision Voting Common Stock Voting Common Stock [Member] Voting Common Stock Weighted average basic shares and unvested restricted stock outstanding (shares) Weighted Average Number of Shares Issued, Basic Derivative, Fixed Interest Rate Derivative, Fixed Interest Rate Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance Finance Receivable, Loan Restructuring and Refinancing, Amortized Balance Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Schedule of Other Assets Schedule of Other Assets [Table Text Block] Securities loaned, fair value of collateral Securities Loaned, Fair Value of Collateral Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Financing Receivable, Modified, Payment Delay Financing Receivable, Modified, Payment Delay Financing Receivable, Modified, Payment Delay Net earnings available to common and equivalent stockholders, basic Net earnings (loss) available to common and equivalent stockholders, basic Net Income (Loss) Available to Common Stockholders, Basic Share Repurchase Program [Domain] Share Repurchase Program [Domain] Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Extended Maturity and Interest Rate Reduction Extended Maturity and Interest Rate Reduction [Member] Short-Term Debt, Other, Average Rate Paid Short-Term Debt, Percentage Bearing Variable Interest Rate Level 1 Fair Value, Inputs, Level 1 [Member] Long-Term Line of Credit Long-Term Line of Credit Lowest Rate of Spread [Axis] Lowest Rate of Spread [Axis] Lowest Rate of Spread Standard & Poor's, AAA Rating Standard & Poor's, AAA Rating [Member] Other Assets [Abstract] Other Assets [Abstract] Equipment leased to others under operating leases Equipment Leased To Others Under Operating Leases Equipment Leased To Others Under Operating Leases Related Party Transaction [Table] Related Party Transaction [Table] Diluted (usd per share) Diluted net income per share (usd per share) Earnings Per Share, Diluted Insurance and assessments Federal Deposit Insurance Corporation Premium Expense 2030 Lessor, Operating Lease, Payment to be Received, Year Five Advance No. 5 Advance No. 5 [Member] Advance No. 5 Multifamily Multifamily [Member] Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Residential Real Estate Construction Financing Receivable Residential Real Estate Construction Financing Receivable [Member] Residential Real Estate Construction Financing Receivable [Member] Provision for Loan, Leases and Unfunded Loan Commitments Provision for Loan, Leases and Unfunded Loan Commitments Provision for Loan, Leases and Unfunded Loan Commitments Loans HFS Financing Receivable, Held-for-Sale Thereafter Sales-Type and Direct Financing Leases, Payment to be Received, after Rolling Year Five Other equity and CRA investments Equity Investments Without Readily Determinable Fair Value Equity Investments Without Readily Determinable Fair Value Reserve for Unfunded Loan Commitments, Balance, beginning of period Reserve for Unfunded Loan Commitments, Balance, end of period Reserve for Unfunded Loan Commitments Reserve for Unfunded Loan Commitments Reserve for Unfunded Loan Commitments Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Schedule of Supplemental Balance Sheet Information Related to Operating Leases Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Advance due 05/26/2026 Advance due 05/26/2026 [Member] Advance due 05/26/2026 Real Estate Construction, Loan Type [Axis] Real Estate Construction, Loan Type [Axis] Real Estate Construction, Loan Type [Axis] Assets and Liabilities, Lessor Assets and Liabilities, Lessor [Table Text Block] Assets and Liabilities, Lessor [Table Text Block] Advance No. 7 Advance No. 7 [Member] Advance No. 7 Prepaid expenses Prepaid Expense Extended Maturity Extended Maturity [Member] Agency residential CMOs Government agency and government-sponsored enterprise collateralized mortgage obligations [Member] Government agency and government-sponsored enterprise collateralized mortgage obligations [Member] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Products and services transferred over time Product and Services Transferred Over Time Product and Services Transferred Over Time Provision Type [Domain] Provision Type [Domain] [Domain] for Expiring provision Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Cash received for income taxes Income Taxes Paid, Net Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Aggregate amortization expense 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Time-Based Restricted Stock Awards Time-Based Restricted Stock Awards [Member] Time-Based Restricted Stock Awards [Member] Balance Long-Term Debt, Gross Pledged Cash for Derivative Contracts Pledged Cash for Derivative Contracts Pledged Cash for Derivative Contracts Total operating lease liabilities Lessee, Operating Lease, Liability, to be Paid Unrealized net holding (losses) gains on securities AFS arising during the period OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Two Thousand Seven One Term Debt Securitization Trust Preferred Securities Two Thousand Seven Series Two [Member] Trust Preferred Securities Two Thousand Seven Series Two. Loans and leases HFI Loans held for investment, net Loans held for investment, net Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Provision for losses on foreclosed assets Provision For Losses On Foreclosed Assets Provision For Losses On Foreclosed Assets Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class Finance Receivable, Loan Restructuring and Refinancing, Percent of Amortized Loan Portfolio Class Unrealized losses on investment securities available-for-sale Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date Lowest Rate of Spread Lowest Rate of Spread [Member] Lowest Rate of Spread Unobservable Inputs [Domain] Unobservable Inputs [Domain] [Domain] for Unobservable Inputs [Axis] Amortization of unrealized net loss on securities transferred from AFS to HTM, net of tax Amortization of Unrealized Net Loss on Securities Transferred From Available-For-Sale to Held-to-Maturity, net of tax Amortization of Unrealized Net Loss on Securities Transferred From Available-For-Sale to Held-to-Maturity, Net of Tax Class B Non-voting common stock ($0.01 par value, 477,321 shares issued at March 31, 2025 and 477,321 share issued at December 31, 2024) Class B Non-voting Common Stock Class B Non-voting Common Stock Aggregate amortization expense 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Five Restricted Stock-Based Compensation Surrendered Restricted Stock-Based Compensation Surrendered [Member] Restricted Stock-Based Compensation Surrendered Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Restricted stock surrendered Restricted stock surrendered Restricted stock surrendered Premises and equipment, net Property, Plant and Equipment, Net Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Financing Receivable Recorded Investment Total Past Due Financing Receivable Recorded Investment Total Past Due Financing Receivable Recorded Investment Total Past Due Entity Current Reporting Status Entity Current Reporting Status Other Residential Real Estate Other Residential Real Estate [Member] Other Residential Real Estate Receivables [Abstract] Receivables [Abstract] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Loss on sale of premises and equipment Gain (Loss) on Disposition of Property Plant Equipment Trust Preferred Securities Two Thousand Six Series Four Trust Preferred Securities Two Thousand Six Series Four [Member] Trust Preferred Securities Two Thousand Six Series Four. Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Repayments of borrowings Repayments of Debt Current Fiscal Year End Date Current Fiscal Year End Date Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Total deposits Deposits Income tax expense related to amortization of unrealized net loss on securities transferred from AFS to HTM OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), Tax Schedule of composition of loans portfolio Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Number of shares available for grant (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Other professional services Professional Fees FRB and FHLB stock, at cost Investment in FHLB stock, Carrying Amount Federal Home Loan Bank Stock Derivative Liability Derivative Liability Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Other expense Other Noninterest Expense Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Advance No. 8 Advance No. 8 [Member] Advance No. 8 Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Pass Pass [Member] Interest rate contracts Interest Rate Contract [Member] Nonvoting Common Stock Equivalents Nonvoting Common Stock Equivalents [Member] Nonvoting Common Stock Equivalents Trust Preferred Securities Two Thousand Six Series Five Trust Preferred Securities Two Thousand Six Series Five [Member] Trust Preferred Securities Two Thousand Six Series Five. Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Proceeds from maturities and paydowns of securities HTM Proceeds from Maturities and Paydowns of Securities Held-to-maturity Proceeds from Maturities and Paydowns of Securities Held-to-maturity Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Equity Securities, FV-NI Equity Securities, FV-NI, Current Equity Warrants, Measurement Input, Remaining Life Equity Warrants, Measurement Input, Remaining Life Equity Warrants, Measurement Input, Remaining Life Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Delinquent loans in loan portfolio Financing Receivable, Past Due [Table Text Block] Real Estate Construction, Loan Type [Domain] Real Estate Construction, Loan Type [Domain] [Domain] for Real Estate Construction, Loan Type [Axis] Interest-bearing deposits Interest-Bearing Deposit Liabilities Net cash (used in) provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Provision for credit losses Financing Receivable, Credit Loss, Expense (Reversal) Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Aggregate amortization expense, thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five three Largest Loan Relationships Three Largest Loan Relationships [Member] Three Largest Loan Relationships Share Repurchase Program, Remaining Authorized, Amount Share Repurchase Program, Remaining Authorized, Amount Subordinated Debentures, Gross Subordinated Debentures, Gross Subordinated Debentures, Gross Not Part Of Lont-term Liabilities Consumer Consumer Portfolio Segment [Member] Subordinated Debt Trust VI Due September 2033 Subordinated Debt Trust VI Due September 2033 [Member] This element represents the subordinated debentures series Trust VI, due September 2033. Subordinated debt has a lower priority of repayment in liquidation of the entity's assets. Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Stock Repurchase Plan - April 23, 2025 Stock Repurchase Plan - April 23, 2025 [Member] Stock Repurchase Plan - April 23, 2025 Entity Tax Identification Number Entity Tax Identification Number SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] Common stock, issued (in shares) Common stock, issued (in shares) Common Stock, Shares, Issued Subordinated Debt Trust FCBI Due December 2035 Subordinated Debt Trust FCBI Due December 2035 [Member] Subordinated Debt Trust FCBI Due December 2035 [Member] Weighted average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Agency commercial MBS Commercial Mortgage-Backed Securities [Member] Goodwill and Other Intangible Assets, Net Goodwill and Intangible Assets Disclosure [Text Block] Allowance for Loan and Lease Losses [Roll Forward] Allowance for Loan and Lease Losses [Roll Forward] Transfers from loans HFI to loans HFS Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale Restricted Cash [Abstract] Restricted Cash [Abstract] Government agency and government-sponsored enterprise pass through securities Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Trading Arrangement: Trading Arrangement [Axis] Derivatives [Abstract] Derivatives [Abstract] Derivatives [Abstract] Total Shareholder Return Amount Total Shareholder Return Amount Leased equipment income Operating Lease, Lease Income Unrealized gain on derivatives, foreign currencies, and credit-linked notes, net Unrealized Gain (Loss) on Derivatives and Foreign Currencies, Net Unrealized Gain (Loss) on Derivatives and Foreign Currencies, Net Security Exchange Name Security Exchange Name More Than One Day but Less Than Three Months (3) More Than One Day but Less Than Three Months (3) [Member] More Than One Day but Less Than Three Months (3) More Than Twenty-Four (24) Months but Less Than Thirty-Six Months (36) More Than Twenty-Four (24) Months but Less Than Thirty-Six Months (36) [Member] More Than Twenty-Four (24) Months but Less Than Thirty-Six Months (36) 2027 Lessor, Operating Lease, Payment to be Received, Year Two Borrowing capacity description Line of Credit Facility, Maximum Borrowing Capacity Dividends, Preferred Stock Dividends, Preferred Stock Stock Issued During Period, Shares, Dividend Reinvestment Plan Stock Issued During Period, Shares, Dividend Reinvestment Plan Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Stock repurchased (in shares) Stock repurchased (in shares) Stock Repurchased During Period, Shares Asset Class [Domain] Asset Class [Domain] Reclassification, Type [Axis] Reclassification, Type [Axis] Statement [Line Items] Statement [Line Items] Debt Securities, Held-to-Maturity, Restricted Debt Securities, Held-to-Maturity, Restricted Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Subordinated Debt Trust VII Due April 2034 Subordinated Debt Trust VII Due April 2034 [Member] This element represents the subordinated debentures series Trust VII, due April 2034. Subordinated debt has a lower priority of repayment in liquidation of the entity's assets. Credit-linked Notes Long-Term Debt, Percentage Bearing Variable Interest, Amount Total Unused Commitments to Extend Credit Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock Common Stock [Member] Other Short-Term Borrowings Other Short-Term Borrowings Credit-linked notes Credit-Link Notes [Member] Credit-Link Notes Net decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Subordinated Debt Interest Rate, Reedemed Subordinated Debt Interest Rate, Reedemed Subordinated Debt Interest Rate, Reedemed Entity Listings [Table] Entity Listings [Table] Advance No. 4 Advance No. 4 [Member] Advance No. 4 Significant Accounting Policies Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Cash flow hedges in Cash, Fair Value Disclosure, Liabilities Cash flow hedges in Cash, Fair Value Disclosure, Liabilities Cash flow hedges in Cash, Fair Value Disclosure, Liabilities Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Prior [Member] Prior [Member] Prior [Member] Business Assets [Member] Business Assets [Member] Business Assets [Member] Restricted stock surrendered Restricted Stock Award, Forfeitures Related Party Transaction [Axis] Related Party Transaction [Axis] Financing Receivable, Nonaccrual, Interest Income Financing Receivable, Nonaccrual, Interest Income Weighted average interest rate Long-Term Debt, Weighted Average Interest Rate, at Point in Time Asset Class [Axis] Asset Class [Axis] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Interest rate swaps Interest Rate Swap [Member] Total included in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Other Borrowings, Fair Value Disclosure Other Borrowings, Fair Value Disclosure Other Borrowings, Fair Value Disclosure Bank owned life insurance Bank Owned Life Insurance Leases [Abstract] Leases [Abstract] 2029 Lessor, Operating Lease, Payment to be Received, Year Four Direct Financing Lease, Net Investment in Leases [Abstract] Direct Financing Lease, Net Investment in Lease, before Allowance for Credit Loss [Abstract] Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Cash flow hedges in Cash, Fair Value Disclosure, Financial Asset Cash flow hedges in Cash, Fair Value Disclosure, Financial Asset Cash flow hedges in Cash, Fair Value Disclosure, Financial Asset Basic (usd per share) Basic earnings (loss) per share (usd per share) Earnings Per Share, Basic Preferred stock dividends declared per share (usd per share) Preferred Stock, Dividends Per Share, Declared Financing Receivable, Nonaccrual [Table] Financing Receivable, Nonaccrual [Table] Income tax benefit (expense) related to unrealized net holding gains arising during the period OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax Measurement Input, Discount Rate Measurement Input, Discount Rate [Member] Net decrease in noninterest-bearing deposits Increase Decrease In Noninterest Bearing Domestic and Foreign Deposits Increase Decrease In Noninterest Bearing Domestic and Foreign Deposits Deposits, Fair Value Disclosure Deposits, Fair Value Disclosure Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Measurement Input Type [Domain] Measurement Input Type [Domain] Schedule of available-for-sale securities reconciliation Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Reserve for Unfunded Loan Commitments, Net charge-offs Reserve for Unfunded Loan Commitments, Net Charge-offs Reserve for Unfunded Loan Commitments, Net Charge-offs Vesting period of time-based restricted stock, lower limit Vesting period of time-based restricted stock, lower limit Vesting period of time-based restricted stock, lower limit Assets carried at fair value on a nonrecurring basis Fair Value Measurements, Nonrecurring [Table Text Block] Anti-dilutive Shares for Earnings Per Share [Domain] Anti-dilutive Shares for Earnings Per Share [Domain] Anti-dilutive Shares for Earnings Per Share [Domain] Finance Receivable Allowance Finance Receivable Allowance [Member] Finance Receivable Allowance [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Asset-backed Other securities [Member] Other securities [Member] Taxable interest Interest Income, Securities, Operating, Taxable Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Tax Period [Domain] Tax Period [Domain] Goodwill and Intangible Assets 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[Member] 5 Special Mention [Member] Statement [Table] Statement [Table] Restricted Cash Restricted Assets Disclosure [Text Block] Adjustments to reconcile net earnings to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Amortization of unrealized net loss on securities transferred from AFS to HTM OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax1 OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax1 Measurement Input, Risk Free Interest Rate Measurement Input, Risk Free Interest Rate [Member] Contract with Customer, Liability Contract with Customer, Liability Number of note classes Debt Instrument, Number of Classes Debt Instrument, Number of Classes Trust Preferred Securities Two Thousand Five Series Two Trust Preferred Securities Two Thousand Five Series Two [Member] Trust Preferred Securities Two Thousand Five Series Two. Restricted Stock Amortization Restricted Stock Amortization Restricted Stock Amortization All Adjustments to Compensation All Adjustments to Compensation [Member] Commercial Collateralized Financing Receivable Loan Type [Axis] Commercial Collateralized Financing Receivable Loan Type [Axis] Commercial Collateralized Financing Receivable Loan Type [Axis] Amendment Flag Amendment Flag Sale of Stock, Price Per Share Sale of Stock, Price Per Share Loan commitments to extend credit Loans and Leases Commitments To Extend Credit Loans and Leases Commitments To Extend Credit Number of shares authorized (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Spread to 10 Year Treasury Spread to 10 Year Treasury [Member] Spread to 10 Year Treasury Standard & Poor's, AA+ Rating Standard & Poor's, AA+ Rating [Member] Land and Acquisitions and Development Loans Land and Acquisitions and Development Loans Land and Acquisitions and Development Loans Termination Date Trading Arrangement Termination Date Interest-earning deposits in financial institutions Interest-Bearing Deposits in Banks and Other Financial Institutions Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Allowance for loan and lease losses Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Subordinated Debt Obligations, Fair Value Disclosure Subordinated Debt Obligations, Fair Value Disclosure Receivable [Domain] Receivable [Domain] Financing Receivable, Unamortized Purchase Premium Financing Receivable, Unamortized Purchase Premium Financing Receivable, Unamortized Purchase Premium Investor with Common Stock [Domain] Investor with Common Stock [Domain] Investor with Common Stock [Domain] Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Loans and Finance Receivables [Member] Loans and Finance Receivables [Member] Weighted-average basic shares outstanding (shares) Weighted Average Number of Shares Outstanding, Basic Net income per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Related Party Transaction [Domain] Related Party Transaction [Domain] Individually Evaluated Loans and Leases, Weight Average Rate Individually Evaluated Loans and Leases, Weight Average Rate Individually Evaluated Loans and Leases, Weight Average Rate Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Credit-linked ,Variable interest, percentage rate Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate Debt Disclosure [Abstract] Debt Disclosure [Abstract] PacWest 2017 Stock Incentive Plan [Member] PacWest 2017 Stock Incentive Plan [Member] PacWest 2017 Stock Incentive Plan Debt Securities, Available-for-Sale, Realized Gain (Loss) Debt Securities, Available-for-Sale, Realized Gain (Loss) Proceeds from sales of foreclosed assets Proceeds from Sale of Foreclosed Assets Unamortized discount Debt Instrument, Unamortized Discount Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Class Of Warrant Outstanding Class Of Warrant Outstanding Class Of Warrant Outstanding Non-Voting Common Stock, Equivalents Repurchased Non-Voting Common Stock, Equivalents Repurchased Non-Voting Common Stock, Equivalents Repurchased Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Loan expense Loan Expense Loan expenses that include legal fees, collection expenses, credit reports and fees paid to government agencies on recovered assets. Use of Estimates Use of Estimates, Policy [Policy Text Block] Occupancy Occupancy, Net Present value of lease payments Sales-type and Direct Financing Leases, Lease Receivable Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Sales, Equity Warrants Proceeds from Issuance of Warrants Lowest Rate of Spread [Domain] Lowest Rate of Spread [Domain] Lowest Rate of Spread [Domain] Total interest income on investment securities Investment Income, Interest and Dividend Cash and due from banks Cash and Cash Due From Banks Cash and Cash Due From Banks Alternative energy partnerships (HLBV investments) Alternative Energy Partnerships (HLBV Investments) Alternative Energy Partnerships (HLBV Investments) Total liabilities Liabilities Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Products and services transferred at a point in time Revenue, Performance Obligation Satisfied At Point In Time Revenue, Performance Obligation Satisfied At Point In Time - Related to transfer now of transfer later of services Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Net decrease (increase) in loans and leases Payments for (Proceeds from) Loans and Leases Demand, interest checking, money market, and savings deposits Deposits, Savings Deposits Foreclosed assets, net Other Real Estate, Foreclosed Assets, and Repossessed Assets Servicing Rights Servicing Rights Servicing Rights Financing Receivable, Allowance for Receivable Charge-offs and Recoveries [Line Items] Financing Receivable, Allowance for Receivable Charge-offs and Recoveries [Line Items] Financing Receivable, Allowance for Receivable Charge-offs and Recoveries [Line Items] Asset-backed securities Asset-Backed Securities [Member] Subordinated debt Interest Expense, Subordinated Notes and Debentures Securities held-to-maturity, at amortized cost, net of allowance for credit losses (fair value of $2,227,000 and $2,246,526, respectively)(ACL of $695 and $695, respectively) Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,857,903 and $2,646,414, respectively) Fair Value Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt securities Corporate Debt Securities [Member]