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Stockholders' Equity - Narrative (Details) - USD ($)		3 Months Ended				9 Months Ended
	Nov. 30, 2023	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 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		$ 5,900,000			$ 5,200,000	$ 17,300,000	$ 13,300,000
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)		150,826,212				150,826,212				158,346,529
Common stock, issued (in shares)		150,904,772				150,904,772				158,557,735
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 24.60				$ 24.60
Term of warrants		7 years				7 years
Common shares purchased under Dividend Reinvestment Plan		$ 35,882,000	$ 112,914,000	$ 38,931,000
Shares Acquired, Cost Per Share		$ 16.38
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of time-based restricted stock, higher limit						4 years
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased (in shares)		10,000
Conversion of non-voting common stock equivalents to Voting Common Stock		45,000
Stock Repurchase Plan - March 17, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share 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
Share Repurchase Program, Remaining Authorized, Amount		$ 114,500,000				$ 114,500,000
Stock Repurchase Plan - April 23, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Repurchase Program, Authorized, Amount								$ 300,000,000.0
Stock repurchased (in shares)		2,153,792	8,809,814			13,648,429
Stock repurchased (in dollars per share)		$ 16.48	$ 12.65			$ 13.59
Common shares purchased under Dividend Reinvestment Plan		$ 35,500,000	$ 111,500,000			$ 185,500,000
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				158,346,529				150,826,212
Common Stock, Shares Authorized		446,863,844				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				27,000,000
Common stock, outstanding (in shares)		4,140,600				4,140,600
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				477,321
Common Stock, Shares Authorized		3,136,156				3,136,156
Common stock, issued (in shares)		477,321				477,321				477,321
Nonvoting Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, issued (in shares)		4,140,600				4,140,600				9,790,600
Nonvoting Common Stock | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of non-voting common stock equivalents to Voting Common Stock		(1,150,000)
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted shares (shares)		2,426,262				2,426,262
PacWest 2018 Amended and Revised Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (shares)		10,717,882				10,717,882
Number of shares available for grant (shares)		3,392,919				3,392,919
Unrecognized share based compensation expense		$ 49,800,000				$ 49,800,000
PacWest 2018 Amended and Revised Stock Incentive Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted shares (shares)		2,611,113				2,611,113
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)		78,656				78,656

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