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Foreclosed Assets Foreclosed Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Real Estate Owned Net $ 35,423pacw_OtherRealEstateOwnedNet $ 51,837pacw_OtherRealEstateOwnedNet    
Other Foreclosed Assets 8,298pacw_ForeclosedAssetsCoveredandNonCovered 4,054pacw_ForeclosedAssetsCoveredandNonCovered    
Foreclosed assets, net 43,721pacw_OtherRealEstateOwnedNetCoveredandNoncoveredincludingForeclosedAssets [1] 55,891pacw_OtherRealEstateOwnedNetCoveredandNoncoveredincludingForeclosedAssets [1] 56,414pacw_OtherRealEstateOwnedNetCoveredandNoncoveredincludingForeclosedAssets 81,918pacw_OtherRealEstateOwnedNetCoveredandNoncoveredincludingForeclosedAssets
NonCovered [Member] | Commercial Real Estate [Member]        
Other Real Estate Owned Net 2,449pacw_OtherRealEstateOwnedNet
/ us-gaap_FairValueByAssetClassAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
     
NonCovered [Member] | Construction and Land Development [Member]        
Other Real Estate Owned Net 24,759pacw_OtherRealEstateOwnedNet
/ us-gaap_FairValueByAssetClassAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pacw_ConstructionandLandDevelopmentMember
     
NonCovered [Member] | Multi Family [Member]        
Other Real Estate Owned Net 4,823pacw_OtherRealEstateOwnedNet
/ us-gaap_FairValueByAssetClassAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pacw_MultiFamilyMember
     
NonCovered [Member] | Residential Mortgage [Member]        
Other Real Estate Owned Net 3,392pacw_OtherRealEstateOwnedNet
/ us-gaap_FairValueByAssetClassAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
     
Covered [Member] | Commercial Real Estate [Member]        
Other Real Estate Owned Net   15,753pacw_OtherRealEstateOwnedNet
/ us-gaap_FairValueByAssetClassAxis
= pacw_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
   
Covered [Member] | Construction and Land Development [Member]        
Other Real Estate Owned Net   35,063pacw_OtherRealEstateOwnedNet
/ us-gaap_FairValueByAssetClassAxis
= pacw_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pacw_ConstructionandLandDevelopmentMember
   
Covered [Member] | Multi Family [Member]        
Other Real Estate Owned Net   835pacw_OtherRealEstateOwnedNet
/ us-gaap_FairValueByAssetClassAxis
= pacw_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pacw_MultiFamilyMember
   
Covered [Member] | Residential Mortgage [Member]        
Other Real Estate Owned Net   186pacw_OtherRealEstateOwnedNet
/ us-gaap_FairValueByAssetClassAxis
= pacw_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
   
Covered [Member]        
Foreclosed assets, net $ 9,300pacw_OtherRealEstateOwnedNetCoveredandNoncoveredincludingForeclosedAssets
/ pacw_LoanBalanceAmountTypeAxis
= pacw_CoveredMember
$ 9,000pacw_OtherRealEstateOwnedNetCoveredandNoncoveredincludingForeclosedAssets
/ pacw_LoanBalanceAmountTypeAxis
= pacw_CoveredMember
   
[1] (1)As of December 31, 2014 and 2013, the amounts of covered foreclosed assets were $9.3 million and $9.0 million.