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Income Taxes Income Taxes (Details Textuals) (USD $)
 12 Months Ended
Dec. 31, 2014
Apr. 07, 2014
Dec. 31, 2013
Dec. 31, 2012
Increase related to CapitalSource Inc. merger $ 18,724,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition      
Statutory Federal Income Tax Rate 35.00%pacw_StatutoryFederalIncomeTaxRate      
Income Taxes Receivable 18,300,000us-gaap_IncomeTaxReceivable   39,600,000us-gaap_IncomeTaxReceivable  
Deferred Tax Assets, Valuation Allowance 130,282,000us-gaap_DeferredTaxAssetsValuationAllowance 130,700,000us-gaap_DeferredTaxAssetsValuationAllowance 0us-gaap_DeferredTaxAssetsValuationAllowance  
Unused Federal operating loss carryforwards 446,400,000pacw_UnusedFederaloperatinglosscarryforwards      
Unused State operating loss carryforwards 936,300,000pacw_UnusedStateoperatinglosscarryforwards      
Unused Federal capital loss carryforwards 135,800,000pacw_UnusedFederalcapitallosscarryforwards      
Low Income Housing Tax Credit carryforwards 3,300,000pacw_LowIncomeHousingTaxCreditcarryforwards      
Tax Credit Carryforward, Expiration Date Dec. 31, 2034      
Unrecognized Tax Benefits 20,501,000us-gaap_UnrecognizedTaxBenefits   0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 2,400,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 2,000,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 200,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 3,300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued      
Minimum [Member]        
Unused Federal operating loss carryforward expiration date 1/1/2030      
State operating loss carryforwards expiration date 2015-12-31      
Federal capital loss carryforward expiration date 1-1-2015      
Foreign tax credit carryforward expiration date Jan. 01, 2016      
Open Tax Year 2006      
Maximum [Member]        
Unused Federal operating loss carryforward expiration date 12/31/2031      
State operating loss carryforwards expiration date 2033-12-31      
Federal capital loss carryforward expiration date 12-31-2019      
Foreign tax credit carryforward expiration date Dec. 31, 2021      
Open Tax Year 2013      
CapitalSource Inc. [Member]        
Unused Federal capital loss carryforwards 132,400,000pacw_UnusedFederalcapitallosscarryforwards
/ us-gaap_BusinessAcquisitionAxis
= pacw_CapitalSourceInc.MemberMember		      
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 28,600,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
/ us-gaap_BusinessAcquisitionAxis
= pacw_CapitalSourceInc.MemberMember		      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 3,100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
/ us-gaap_BusinessAcquisitionAxis
= pacw_CapitalSourceInc.MemberMember		      
State and Local Jurisdiction [Member] | Minimum [Member]        
Income Tax Examination, Year under Examination 2006      
State and Local Jurisdiction [Member] | Maximum [Member]        
Income Tax Examination, Year under Examination 2012      
Internal Revenue Service (IRS) [Member] | Minimum [Member]        
Income Tax Examination, Year under Examination 2008      
Internal Revenue Service (IRS) [Member] | Maximum [Member]        
Income Tax Examination, Year under Examination 2012