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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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