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Stock Based Compensation Plan Stock-based Compensation Plan (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Apr. 07, 2014
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity Instruments Other than Options, Nonvested, Number 1,108,505us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 1,216,524us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 1,698,281us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber   1,675,730us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
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 1,013,377pacw_Awardedsharesofrestrictedcommonstockvestedduetothetriggeringofthechangeofcontrolprovisioncontainedwithinthe2003Plan        
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 $ 26.1pacw_Expenseincurredduetoawardedsharesofrestrictedcommonstockvestedduetothetriggeringofthechangeofcontrolprovisioncontainedwithinthe2003Plan        
Share Price $ 45.46us-gaap_SharePrice [1]        
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity Instruments Other than Options, Nonvested, Number 1,108,505us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 53.4us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
30.9us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
4.5us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options 36.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 1 year 6 months 37 days 1 year 6 months 37 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 9.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember
8.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember
5.7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember
   
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost 26.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember
12.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember
     
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 3.9us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember
$ 3.4us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember
$ 2.2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= pacw_VestingBasedOnServiceMember
   
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 13,531,719us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= pacw_PacWest2003StockIncentivePlanMember
       
Share-based compensation arrangement, Number of Shares Available for Grant due to CapitalSource, Inc Compensation Plan 10,107,039pacw_SharebasedcompensationarrangementNumberofSharesAvailableforGrantduetoCapitalSourceIncCompensationPlan
/ us-gaap_PlanNameAxis
= pacw_PacWest2003StockIncentivePlanMember
       
Capitalsource, Inc. [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Business Acquisition, Effective Date of Acquisition Apr. 07, 2014     Apr. 07, 2014  
[1] (1)Determined using the $45.46 closing price of PacWest common stock on December 31, 2014.