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Commitments and Contingencies (Details Textual) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Long-term Purchase Commitment [Line Items]    
Commitment To Contribute Capital $ 11.0pacw_CommitmentToContributeCapital $ 11.0pacw_CommitmentToContributeCapital
Private Equity Funds [Member]    
Long-term Purchase Commitment [Line Items]    
Purchase Commitment, Remaining Minimum Amount Committed   $ 2.9us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_PrivateEquityFundsMember
Number of funds   11pacw_Numberoffunds
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_PrivateEquityFundsMember