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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Credit Extensions    
Allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision $ 15,600,000ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision $ 12,700,000ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision
Undisbursed Loan Commitments    
Credit Extensions    
Loan 3,710,000,000ewbc_LoansAndLeasesReceivableCommitments
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 3,870,000,000ewbc_LoansAndLeasesReceivableCommitments
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Commercial and Standby Letters of Credit    
Credit Extensions    
Commercial and standby letters of credit issued $ 1,440,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_FinancialInstrumentAxis
= ewbc_CommercialAndStandbyLettersOfCreditMember		 $ 1,250,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_FinancialInstrumentAxis
= ewbc_CommercialAndStandbyLettersOfCreditMember