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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 2) (USD $)
In Billions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Non-Covered loans receivable disclosures    
Covered and non-covered loans receivable pledged to secure borrowings from the FHLB and the Federal Reserve Bank 14.66us-gaap_LoansPledgedAsCollateral $ 10.57us-gaap_LoansPledgedAsCollateral
Residential | Single-family | Minimum | Non-covered loans    
Non-Covered loans receivable disclosures    
Number of units of residential property securing fixed and adjustable rate first mortgage loans 1ewbc_NumberOfUnitsForWhichBothFixedAndAdjustableRateFirstMortgageLoansSecured
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ewbc_ResidentialSingleFamilyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
Adjustable rate mortgage, term of initial fixed interest rates 1 year  
Residential | Single-family | Maximum | Non-covered loans    
Non-Covered loans receivable disclosures    
Number of units of residential property securing fixed and adjustable rate first mortgage loans 4ewbc_NumberOfUnitsForWhichBothFixedAndAdjustableRateFirstMortgageLoansSecured
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ewbc_ResidentialSingleFamilyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
Adjustable rate mortgage, term of initial fixed interest rates 3 years  
Residential | Multifamily | Minimum | Non-covered loans    
Non-Covered loans receivable disclosures    
Adjustable rate mortgage, term of initial fixed interest rates 6 months  
Residential | Multifamily | Maximum | Non-covered loans    
Non-Covered loans receivable disclosures    
Adjustable rate mortgage, term of initial fixed interest rates 3 years