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Stock Based Compensation Plans Stock Based Compensation Plans (Details 1) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,129,445us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber     1,108,505us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Vesting period of time-based restricted stock, lower limit 3 years      
Vesting period of time-based restricted stock, higher limit 4 years      
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 19,686,565us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= pacw_PacWest2003StockIncentivePlanMember
     
Share-based compensation arrangement, number of Shares Authorized due to CapitalSource, Inc Plan 10,686,565pacw_SharebasedcompensationarrangementnumberofSharesAuthorizedduetoCapitalSourceIncPlan
/ us-gaap_PlanNameAxis
= pacw_PacWest2003StockIncentivePlanMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 13,510,779us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= pacw_PacWest2003StockIncentivePlanMember
     
Share-based compensation arrangement, Number of Shares Available for Grant due to CapitalSource, Inc Compensation Plan 10,082,099pacw_SharebasedcompensationarrangementNumberofSharesAvailableforGrantduetoCapitalSourceIncCompensationPlan
/ us-gaap_PlanNameAxis
= pacw_PacWest2003StockIncentivePlanMember
     
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options 34.6us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Restricted Stock [Member] | Vesting Based On Service [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense 3.1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember
$ 2.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember
$ 1.6us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember