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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 14) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Allowance for Unfunded Loan Commitments, Off-Balance Sheet Credit Exposures and Recourse Provisions    
Allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision $ 12,700,000ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision $ 11,300,000ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision
Non-covered loans    
Allowance for Unfunded Loan Commitments, Off-Balance Sheet Credit Exposures and Recourse Provisions    
Allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision 12,700,000ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 11,300,000ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
Off-balance sheet loans serviced for others 1,190,000,000us-gaap_DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 1,350,000,000us-gaap_DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
Portion of allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provisions related to off-balance sheet loans sold and securitized $ 2,200,000ewbc_PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansSoldAndSecuritized
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 $ 3,200,000ewbc_PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansSoldAndSecuritized
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember