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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 9) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restructured loans disclosures      
Period for which restructured loans remains on nonaccrual status, to demonstrate that the borrower can perform under the restructured terms 6 months    
Non-covered loans      
Restructured loans disclosures      
Period for which restructured loans remains on nonaccrual status, to demonstrate that the borrower can perform under the restructured terms 6 months    
Performing loan | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 68,300us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 $ 71,800us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
Performing loan | A/B Note Splits | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 2,900us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= ewbc_ABNoteSplitsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 4,300us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= ewbc_ABNoteSplitsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
Nonperforming loan | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 20,700us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 11,100us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
CRE | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 8,600us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 17,500us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 9,200us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
CRE | Performing loan | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 28,400us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 37,600us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
CRE | Nonperforming loan | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 8,200us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 3,400us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
C&I | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 3,200us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 15,600us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 5,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
C&I | Performing loan | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 16,200us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 16,700us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
C&I | Nonperforming loan | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 5,500us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 3,500us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
Residential | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 12,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 1,100us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 33,700us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
Residential | Performing loan | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 22,500us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 17,400us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
Residential | Nonperforming loan | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 7,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 3,600us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
Consumer | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 504us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 639us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 108us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
Consumer | Performing loan | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 1,200us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 108us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
Consumer | Nonperforming loan | Non-covered loans      
Restructured loans disclosures      
Loan balance of restructured loans 0us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 $ 639us-gaap_FinancingReceivableModificationsRecordedInvestment
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember