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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 10) (Non-covered loans, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Performing loan    
Restructured loans disclosures    
Allowance for troubled debt restructurings loans receivable $ 13,100ewbc_AllowanceForTroubledDebtRestructuringsLoansReceivable
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 $ 13,000ewbc_AllowanceForTroubledDebtRestructuringsLoansReceivable
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
Nonperforming loan    
Restructured loans disclosures    
Allowance for troubled debt restructurings loans receivable $ 1,900ewbc_AllowanceForTroubledDebtRestructuringsLoansReceivable
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 $ 836ewbc_AllowanceForTroubledDebtRestructuringsLoansReceivable
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember