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Stockholders' Equity - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Jun. 06, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted Stock Amortization |  | $ 3,700,000 | $ 7,700,000 | $ 8,100,000 | $ 12,700,000 |  |
Vesting period of time-based restricted stock, lower limit |  |  |  | 3 years |  |  |
Preferred stock issued (shares) |  | 513,250 |  | 513,250 |  |  |
Preferred Stock, Shares Authorized | 50,000,000 |  |  |  |  |  |
Common stock, outstanding (in shares) |  | 157,941,818 |  | 157,941,818 |  | 156,790,349 |
Common stock, issued (in shares) |  | 158,252,791 |  | 158,252,791 |  | 157,651,752 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 24.60 |  | $ 24.60 |  |  |
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) |  |  |  |  |  | 156,790,349 |
Common Stock, Shares Authorized |  | 446,863,844 |  | 446,863,844 |  | 157,941,818 |
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 |  | 27,000,000 |
Common stock, outstanding (in shares) |  | 10,145,600 |  | 10,145,600 |  | 10,829,990 |
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 |  | 477,321 |  | 477,321 |
Common Stock, Shares Authorized |  | 3,136,156 |  | 3,136,156 |  |  |
Common stock, issued (in shares) |  | 477,321 |  | 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) |  | 2,532,921 |  | 2,532,921 |  |  |
PacWest 2017 Stock Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available for grant (shares) |  | 4,659,072 |  | 4,659,072 |  |  |
Unrecognized share based compensation expense |  | $ 56,900,000 |  | $ 56,900,000 |  |  |
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) |  | 310,973 |  | 310,973 |  |  |
PacWest 2017 Revised Stock Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized (shares) |  | 8,789,197 |  | 8,789,197 |  |  |
PacWest 2003 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unvested restricted shares (shares) |  | 1,861,956 |  | 1,861,956 |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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