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Stockholders' Equity - Narrative (Details) - USD ($)		3 Months Ended
	Nov. 30, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Jun. 06, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Amortization		$ 4,400,000	$ 5,000,000
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)		157,608,893		156,790,349
Common stock, issued (in shares)		158,390,708		157,651,752
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 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		157,608,893
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)		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
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)		296,614
PacWest 2017 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (shares)		6,983,382
Unrecognized share based compensation expense		$ 46,100,000
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)		781,815
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
PacWest 2003 Stock Incentive Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted shares (shares)		1,825,307

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