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Goodwill and Other Intangible Assets (Details Textual) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Goodwill, Impairment Loss $ (6,645,000)us-gaap_GoodwillImpairmentLoss      
Impairment of Intangible Assets, Finite-lived 804,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years 6 months 20 days      
Aggregate Amortization Expense 2015 6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths      
Aggregate Amortization Expense 2016 4,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo      
Aggregate Amortization Expense 2017 2,300,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree      
Aggregate Amortization Expense 2018 2,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour      
Aggregate Amortization Expense 2019 1,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive      
CDI and CRI [Member]        
Impairment of Intangible Assets, Finite-lived 1,300,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
 
CDI and CRI [Member] | Celtic Capital Corporation [Member]        
Impairment of Intangible Assets, Finite-lived       $ 500,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ pacw_FullyAmortizedPortionOfIntangiblesAxis
= pacw_CDIandCRIMember
/ dei_LegalEntityAxis
= pacw_CelticCapitalCorporationMember