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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 3) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 17, 2014
Loans Held for Sale        
Total loans held for sale $ 45,950,000us-gaap_LoansReceivableHeldForSaleNet $ 204,970,000us-gaap_LoansReceivableHeldForSaleNet    
Write-down of loans transferred from loans held for investment to loans held for sale recorded to allowance for loan losses 5,200,000ewbc_WriteDownsOnLoansHeldForSale 0ewbc_WriteDownsOnLoansHeldForSale    
Loans receivable reclassified to loans held for sale 837,389,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 97,065,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 144,131,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1  
Non-covered loans        
Credit Risk and Concentrations        
Percentage of non-covered commercial real estate loans and non-covered residential loans secured by real properties located in California 80.00%ewbc_NoncoveredCommercialRealEstateLoansAndNoncoveredResidentialLoansSecuredByRealPropertiesLocatedInCaliforniaConcentrationRiskPercentage
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		      
Non-Covered Loans 20,249,451,000ewbc_NoncoveredLoansReceivableGross
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 [1] 15,678,317,000ewbc_NoncoveredLoansReceivableGross
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 [1]    
Purchased Loans        
Loans purchased during the period 113,200,000ewbc_LoansAcquiredDuringPeriod
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 759,300,000ewbc_LoansAcquiredDuringPeriod
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		    
Percentage of purchased loans classified as student loans   63.00%ewbc_PercentageOfPurchasedLoansClassifiedAsStudentLoans
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		    
Loans Held for Sale        
Total loans held for sale 46,000,000us-gaap_LoansReceivableHeldForSaleNet
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 205,000,000us-gaap_LoansReceivableHeldForSaleNet
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		    
Proceeds from the sales of Loans held for sale, including loans reclassified to loans held for sale 1,140,000,000ewbc_ProceedsFromSaleOfLoansHeldForSaleAndReclassified
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 376,400,000ewbc_ProceedsFromSaleOfLoansHeldForSaleAndReclassified
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 428,700,000ewbc_ProceedsFromSaleOfLoansHeldForSaleAndReclassified
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
Net gain from sale of loans held for sale during the period 39,100,000us-gaap_GainLossOnSaleOfLoansAndLeases
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 7,800,000us-gaap_GainLossOnSaleOfLoansAndLeases
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 17,000,000us-gaap_GainLossOnSaleOfLoansAndLeases
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		  
Loans receivable reclassified to loans held for sale 837,400,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 97,100,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		    
MetroCorp        
Acquired Loans        
Loans acquired during the period       1,190,000,000ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivable
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
MetroCorp | Non-covered loans        
Acquired Loans        
Loans acquired during the period       1,190,000,000ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivable
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
Acquired loans accounted (as a percent)       6.00%ewbc_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisitionPercentage
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
PCI loans 50,600,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		      
Residential | Non-covered loans        
Credit Risk and Concentrations        
Non-Covered Loans 4,820,668,000ewbc_NoncoveredLoansReceivableGross
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 4,185,309,000ewbc_NoncoveredLoansReceivableGross
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		    
CRE | Non-covered loans        
Credit Risk and Concentrations        
Non-Covered Loans $ 6,134,046,000ewbc_NoncoveredLoansReceivableGross
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		 $ 4,585,077,000ewbc_NoncoveredLoansReceivableGross
/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember		    
[1] Loans net of ASC 310-30 discount.