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Loans and Credit Quality (Details Textual) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing $ 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing  
Non-PCI nonaccrual loans 139,334,000pacw_NonPCInonaccrualloans 83,621,000pacw_NonPCInonaccrualloans
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due 15,800,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue 18,800,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Financing Receivable Recorded Investment Thirty to Eighty Nine Days Past Due 21,700,000pacw_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue 8,700,000pacw_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
Financing Receivable Recorded Investment Nonaccrual Status Current $ 101,800,000pacw_FinancingReceivableRecordedInvestmentNonaccrualStatusCurrent $ 56,100,000pacw_FinancingReceivableRecordedInvestmentNonaccrualStatusCurrent