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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES (Details 4) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Loans in process of foreclosure    
Other real estate owned, net $ 32,692,000us-gaap_OtherRealEstateAndForeclosedAssets $ 32,111,000us-gaap_OtherRealEstateAndForeclosedAssets
Loans Receivable | PCI loans    
Nonaccrual loans    
Loans on nonaccrual status 53,400,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByAssetClassAxis
= ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember
63,400,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByAssetClassAxis
= ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember
Residential real estate properties    
Loans in process of foreclosure    
Carrying amount of foreclosed residential real estate properties included in total net OREO 4,100,000us-gaap_RealEstateAcquiredThroughForeclosure
/ ewbc_CollateralAxis
= us-gaap_ResidentialRealEstateMember
3,500,000us-gaap_RealEstateAcquiredThroughForeclosure
/ ewbc_CollateralAxis
= us-gaap_ResidentialRealEstateMember
Residential    
Loans in process of foreclosure    
Recorded investment of consumer mortgage loans for which formal foreclosure proceedings are in process $ 16,700,000ewbc_MortgageLoansInProcessOfForeclosureAmount
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
$ 16,900,000ewbc_MortgageLoansInProcessOfForeclosureAmount
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember