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Dividend Availability and Regulatory Matters (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets  
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets  
Tier One Leverage Capital $ 1,722,870us-gaap_TierOneLeverageCapital $ 718,800us-gaap_TierOneLeverageCapital
Tier One Leverage Capital to Average Assets 12.34%us-gaap_TierOneLeverageCapitalToAverageAssets 11.22%us-gaap_TierOneLeverageCapitalToAverageAssets
Tier One Leverage Capital Required to be Well Capitalized 698,109us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized 320,405us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Excess Tier One Leverage Capital 1,024,761us-gaap_ExcessTierOneLeverageCapital 398,395us-gaap_ExcessTierOneLeverageCapital
Tier One Risk Based Capital 1,722,870us-gaap_TierOneRiskBasedCapital 718,800us-gaap_TierOneRiskBasedCapital
Tier One Risk Based Capital to Risk Weighted Assets 13.16%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 15.12%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Tier One Risk Based Capital Required to be Well Capitalized 785,781us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized 285,163us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Excess Tier One Risk Based Capital 937,089us-gaap_ExcessTierOneRiskBasedCapital 433,637us-gaap_ExcessTierOneRiskBasedCapital
Capital 2,104,984us-gaap_Capital 778,582us-gaap_Capital
Capital to Risk Weighted Assets 16.07%us-gaap_CapitalToRiskWeightedAssets 16.38%us-gaap_CapitalToRiskWeightedAssets
Capital Required to be Well Capitalized 1,309,635us-gaap_CapitalRequiredToBeWellCapitalized 475,271us-gaap_CapitalRequiredToBeWellCapitalized
Excess Capital 795,349us-gaap_ExcessCapital 303,311us-gaap_ExcessCapital
Pacific Western Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier One Leverage Capital 1,621,546us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 690,440us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Tier One Leverage Capital to Average Assets 11.70%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 10.79%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Tier One Leverage Capital Required to be Well Capitalized 693,174us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 319,999us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Excess Tier One Leverage Capital 928,372us-gaap_ExcessTierOneLeverageCapital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 370,441us-gaap_ExcessTierOneLeverageCapital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Tier One Risk Based Capital 1,621,546us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 690,440us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Tier One Risk Based Capital to Risk Weighted Assets 12.46%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 14.54%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Tier One Risk Based Capital Required to be Well Capitalized 780,834us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 284,825us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Excess Tier One Risk Based Capital 840,712us-gaap_ExcessTierOneRiskBasedCapital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 405,615us-gaap_ExcessTierOneRiskBasedCapital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Capital 1,712,312us-gaap_Capital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 750,152us-gaap_Capital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Capital to Risk Weighted Assets 13.16%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 15.80%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Capital Required to be Well Capitalized 1,301,390us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 474,708us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember
Excess Capital $ 410,922us-gaap_ExcessCapital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember		 $ 275,444us-gaap_ExcessCapital
/ dei_LegalEntityAxis
= pacw_PacificWesternBankMember