Stockholders' Equity - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)	Dec. 31, 2022 $ / shares shares	Jun. 06, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Amortization | $	$ 300,000	$ 9,500,000	$ 12,900,000	$ 26,100,000
Unvested restricted shares (shares)	1,380,848		1,380,848		2,405,878
Vesting period of time-based restricted stock, lower limit			3 years
Preferred stock issued (shares)	513,250		513,250		513,250	20,530,000
Preferred Stock, Liquidation Preference Per Share | $ / shares	$ 1,000		$ 1,000		$ 1,000	$ 1,000
Preferred Stock Depository Share | $	$ 25.00		$ 25.00
Preferred stock par value (usd per share) | $ / shares	$ 0.01		$ 0.01		$ 0.01
1/40th Ownership Interest						0.025
Preferred Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Investment Interest Rate						7.75%
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)	656,049		656,049
Vesting term			3 years
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			0.00%
Performance Shares, Two | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			200.00%
PacWest 2017 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (shares)	2,032,871		2,032,871
Unrecognized share based compensation expense | $	$ 49,400,000		$ 49,400,000
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)	1,380,848		1,380,848
PacWest 2017 Revised Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (shares)	6,650,000		6,650,000