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Stock Based Compensation (Details 1) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 07, 2014
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested restricted shares (shares)   988,825     988,825   1,108,505
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     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    
PacWest 2003 Stock Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized (shares)   19,686,565     19,686,565    
Number of shares available for grant (shares)   13,202,836     13,202,836    
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation not yet recognized   $ 34.8     $ 34.8    
Restricted Stock [Member] | Vesting Based On Service [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense   $ 3.8 $ 4.4 $ 2.9 $ 11.2 $ 6.9  
Capitalsource, Inc. [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Acquisition, Effective Date of Acquisition Apr. 07, 2014