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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 8) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 contract | Dec. 31, 2013 contract | Dec. 31, 2012 contract
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Period beyond which a TDR generally becomes delinquent | 90 days |  |
CRE | Income producing | Non-covered loans |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Number of contracts modified as TDRs that subsequently defaulted |  |  | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Balance of loans modified as TDRs that subsequently defaulted |  |  | $ 271 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
C&I | Commercial business | Non-covered loans |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Number of contracts modified as TDRs that subsequently defaulted | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 2 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Balance of loans modified as TDRs that subsequently defaulted | 957 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 570 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 33 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Residential | Single-family | Non-covered loans |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Number of contracts modified as TDRs that subsequently defaulted |  |  | 2 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Balance of loans modified as TDRs that subsequently defaulted |  |  | 2,830 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Residential | Multifamily | Non-covered loans |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Number of contracts modified as TDRs that subsequently defaulted |  |  | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Balance of loans modified as TDRs that subsequently defaulted |  |  | 378 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Consumer | Other Consumer | Non-covered loans |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Number of contracts modified as TDRs that subsequently defaulted |  | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Balance of loans modified as TDRs that subsequently defaulted |  | $ 639 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |

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