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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES (Details 5) (Loans Receivable, USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
contract
Dec. 31, 2014
Loans Modified as TDRs      
Period beyond which a TDR generally becomes delinquent 90 days    
Non-PCI loans
     
Loans Modified as TDRs      
Number of contracts modified as TDRs that subsequently defaulted 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
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Performing loan | A/B Note Splits      
Loans Modified as TDRs      
Loan balance of restructured loans 2,300,000us-gaap_FinancingReceivableModificationsRecordedInvestment
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  $ 2,900,000us-gaap_FinancingReceivableModificationsRecordedInvestment
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CRE | Non-PCI loans      
Loans Modified as TDRs      
Number of contracts modified as TDRs that subsequently defaulted   1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
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Balance of loans modified as TDRs that subsequently defaulted   2,700,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
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= us-gaap_CommercialRealEstatePortfolioSegmentMember
 
CRE | Non-PCI loans | Income producing      
Loans Modified as TDRs      
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Pre-Modification Outstanding Recorded Investment 828,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ewbc_IncomeProducingFinancingReceivableMember
   
Post-Modification Outstanding Recorded Investment 833,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
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= ewbc_IncomeProducingFinancingReceivableMember
[1]    
C&I | Non-PCI loans      
Loans Modified as TDRs      
Number of contracts modified as TDRs that subsequently defaulted   1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
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Balance of loans modified as TDRs that subsequently defaulted   570,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
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/ ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
 
C&I | Non-PCI loans | Commercial business      
Loans Modified as TDRs      
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
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5us-gaap_FinancingReceivableModificationsNumberOfContracts2
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Pre-Modification Outstanding Recorded Investment 167,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
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1,721,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
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Post-Modification Outstanding Recorded Investment 164,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
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/ us-gaap_FairValueByAssetClassAxis
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[1] 1,691,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
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[1]  
Financial Impact (32,000)us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
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[2] 1,248,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
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[2]  
Residential | Non-PCI loans | Single-family      
Loans Modified as TDRs      
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
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3us-gaap_FinancingReceivableModificationsNumberOfContracts2
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Pre-Modification Outstanding Recorded Investment 281,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
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5,823,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
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Post-Modification Outstanding Recorded Investment 281,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
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[1] 5,804,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
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[1]  
Financial Impact (2,000)us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
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[2]    
[1] Includes subsequent payments after modification and reflects the balance as of March 31, 2015 and 2014.
[2] The financial impact includes charge-offs and specific reserves recorded at modification date.