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Stock Based Compensation Plan Stock-based Compensation Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Apr. 07, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity Instruments Other than Options, Nonvested, Number   1,211,951 1,108,505 1,216,524 1,698,281
Vesting period of time-based restricted stock, lower limit   3 years      
Vesting period of time-based restricted stock, higher limit   4 years      
Awarded shares of restricted common stock vested due to the triggering of the change of control provision contained within the 2003 Plan   1,013,377      
Expense incurred due to awarded shares of restricted common stock vested due to the triggering of the change of control provision contained within the 2003 Plan     $ 26.1 $ 12.4  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value   $ 14.7 53.4 30.9  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 5.6 $ 3.9 $ 3.4  
Share Price [1]   $ 43.10      
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity Instruments Other than Options, Nonvested, Number   1,211,951      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options   $ 41.1      
Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms   2 years 1 month 20 days 1 year 2 months 20 days 1 year 1 month 20 days  
Restricted Stock [Member] | Vesting Based On Service [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense   $ 15.0 $ 9.8 $ 8.5  
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 Authorized   19,686,565      
Share-based compensation arrangement, number of Shares Authorized due to CapitalSource, Inc Plan   10,686,565      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   12,978,460      
Share-based compensation arrangement, Number of Shares Available for Grant due to CapitalSource, Inc Compensation Plan   9,550,459      
Capitalsource, Inc. [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Business Acquisition, Effective Date of Acquisition Apr. 07, 2014        
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 6 months 20 days      
[1] Determined using the $43.10 closing price of PacWest common stock on December 31, 2015.