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Stock-Based Compensation Stock-Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Expense, Tax Benefit $ 6,600 $ 6,000 $ 5,800
Vesting period of time-based restricted stock, lower limit 3 years    
Vesting period of time-based restricted stock, higher limit 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 26,400 $ 26,700 $ 13,100
Equity Instruments Other than Options, Nonvested, Number 2,405,878 2,312,080  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 31.63 $ 37.65 $ 20.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 2,200 $ 800 $ 2,700
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period 3 years    
Share-Based Compensation Arrangement By Share-based Payment Award, Performance Target, Minimum 0.00%    
Granted 994,185    
Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 29.81    
Granted 28,439    
Restricted Stock-Based Compensation      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Benefits and Share-based Compensation $ 845 859 627
Restricted Stock [Member] | Vesting Based On Service [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Expense 33,900 $ 31,400 $ 23,700
Restricted Stock Awards And Performance Based Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 64,600    
PRSU      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity Instruments Other than Options, Nonvested, Number 582,287 512,863  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 37.95 $ 32.19 $ 36.20
Granted 150,007    
PacWest 2003 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,120,291    
PacWest 2003 Stock Incentive Plan [Member] | Time-Based Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity Instruments Other than Options, Nonvested, Number 2,405,878    
PacWest 2017 Total Amended and Restated Stock Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 6,650,000    
Outstanding at Year-End [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 1 year 3 months 18 days    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Arrangement By Share-based Payment Award, Performance Target, Maxium 150.00%    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Arrangement By Share-based Payment Award, Performance Target, Maxium 200.00%