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Foreclosed Assets Foreclosed Assets Textuals (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Real Estate Owned Net Covered and NonCovered Including Foreclosed Assets [Abstract]        
Foreclosed assets, net $ 43,721pacw_OtherRealEstateOwnedNetCoveredandNoncoveredincludingForeclosedAssets [1] $ 55,891pacw_OtherRealEstateOwnedNetCoveredandNoncoveredincludingForeclosedAssets [1] $ 56,414pacw_OtherRealEstateOwnedNetCoveredandNoncoveredincludingForeclosedAssets $ 81,918pacw_OtherRealEstateOwnedNetCoveredandNoncoveredincludingForeclosedAssets
Covered [Member]        
Other Real Estate Owned Net Covered and NonCovered Including Foreclosed Assets [Abstract]        
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.