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Stock-Based Compensation Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Payment Arrangement, Expense, Tax Benefit | $ 3,600 | $ 3,900 | $ 6,600
Share-Based Payment Arrangement, Weighted Average Period, Amortization Expense | 2 years 9 months 18 days |  |
Vesting period of time-based restricted stock, lower limit | 3 years |  |
Vesting period of time-based restricted stock, higher limit | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 41.49 | $ 48.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  | $ 600 | $ 2,200
Restricted Stock-Based Compensation |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee Benefits and Share-based Compensation | $ 944 | 1,305 | 845
Restricted Stock [Member] | Vesting Based On Service [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Payment Arrangement, Expense | 14,500 | $ 27,400 | $ 33,900
Restricted Stock Awards And Performance Based Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 45,100 |  |
Time-Based Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity Instruments Other than Options, Nonvested, Number | 211,206 | 861,403 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 0 |  |
PRSU |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity Instruments Other than Options, Nonvested, Number | 2,283,531 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 9.00 | $ 48.41 | $ 57.78
TRSA |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 6,000 | $ 14,000 | $ 26,400
RSU |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 3,800 |  |
PacWest 2017 Total Amended and Restated Stock Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 10,717,882 |  |
PacWest 2018 Stock Incentive Plan | Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity Instruments Other than Options, Nonvested, Number | 1,759,335 |  |
PacWest 2003 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 4,955,607 |  |
PacWest 2003 Stock Incentive Plan [Member] | Time-Based Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity Instruments Other than Options, Nonvested, Number | 211,206 |  |

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