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Stockholders' Equity - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2023 | Apr. 21, 2025 | Apr. 21, 2025 | Mar. 31, 2025 | Mar. 31, 2024 | Apr. 23, 2025 | Mar. 17, 2025 | Dec. 31, 2024 | Jun. 06, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted Stock Amortization |  |  |  | $ 5,200,000 | $ 4,400,000 |  |  |  |
Vesting period of time-based restricted stock, lower limit |  |  |  | 3 years |  |  |  |  |
Preferred stock issued (shares) |  |  |  | 513,250 |  |  |  |  |
Preferred Stock, Shares Authorized | 50,000,000 |  |  |  |  |  |  |  |
Common stock, outstanding (in shares) |  |  |  | 155,947,503 |  |  |  | 158,346,529 |
Common stock, issued (in shares) |  |  |  | 156,135,165 |  |  |  | 158,557,735 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 24.60 |  |  |  |  |
Term of warrants |  |  |  | 7 years |  |  |  |  |
Common shares purchased under Dividend Reinvestment Plan |  |  |  | $ 38,931,000 |  |  |  |  |
Stock Repurchase Plan - March 17, 2025 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 150,000,000.0 |  |
Stock repurchased (in shares) |  |  |  | 2,684,823 |  |  |  |  |
Stock repurchased (in dollars per share) |  |  |  | $ 14.36 |  |  |  |  |
Common shares purchased under Dividend Reinvestment Plan |  |  |  | $ 38,500,000 |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 111,500,000 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 300,000,000.0 |  |  |
Stock repurchased (in shares) |  | 8,809,814 | 11,494,637 |  |  |  |  |  |
Stock repurchased (in dollars per share) |  | $ 12.65 | $ 13.05 |  |  |  |  |  |
Common shares purchased under Dividend Reinvestment Plan |  | $ 111,500,000 | $ 150,000,000.0 |  |  |  |  |  |
Centerbridge Investor |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Warrants Issued, Per Share Price | $ 15.375 |  |  |  |  |  |  |  |
BANC |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock, outstanding (in shares) |  |  |  | 158,346,529 |  |  |  | 155,947,503 |
Common Stock, Shares Authorized |  |  |  | 446,863,844 |  |  |  | 446,863,844 |
Preferred Class A | Pacific Western Bank |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Investment Interest Rate |  |  |  |  |  |  |  |  | 7.75%
NVCE Non-voting Share Class |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  | 27,000,000 |  |  |  | 27,000,000 |
Common stock, outstanding (in shares) |  |  |  | 9,790,600 |  |  |  |  |
NVCE Non-voting Share Class | Centerbridge Investor |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock, issued (in shares) | 3,048,780 |  |  |  |  |  |  |  |
NVCE Non-voting Share Class | Warburg Investors |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock, issued (in shares) | 15,853,659 |  |  |  |  |  |  |  |
Class B Nonvoting |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock, outstanding (in shares) |  |  |  | 477,321 |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 3,136,156 |  |  |  |  |
Common stock, issued (in shares) |  |  |  | 477,321 |  |  |  | 477,321 |
Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period of time-based restricted stock, higher limit |  |  |  | 4 years |  |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unvested restricted shares (shares) |  |  |  | 2,478,485 |  |  |  |  |
PacWest 2017 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares available for grant (shares) |  |  |  | 3,290,653 |  |  |  |  |
Unrecognized share based compensation expense |  |  |  | $ 58,200,000 |  |  |  |  |
PacWest 2017 Stock Incentive Plan [Member] | Time-Based Restricted Stock Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unvested restricted shares (shares) |  |  |  | 189,495 |  |  |  |  |
PacWest 2017 Revised Stock Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized (shares) |  |  |  | 10,717,882 |  |  |  |  |
PacWest 2003 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unvested restricted shares (shares) |  |  |  | 2,785,335 |  |  |  |  |

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