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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $) | Mar. 31, 2015 | Dec. 18, 2014 | Dec. 31, 2014
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F&F, LLC and 618 Investment, Inc. v. East West Bank | East West Bank |  |  |
Litigation |  |  |
Interim adjusted amount of the verdict |  | $ 36,600,000 us-gaap_LossContingencyEstimateOfPossibleLoss / dei_LegalEntityAxis = ewbc_EastWestBankMember / us-gaap_LitigationCaseAxis = ewbc_FAndFLLCAnd618InvestmentIncVEastWestBankMember |
Litigation accrual | 32,600,000 us-gaap_LossContingencyAccrualAtCarryingValue / dei_LegalEntityAxis = ewbc_EastWestBankMember / us-gaap_LitigationCaseAxis = ewbc_FAndFLLCAnd618InvestmentIncVEastWestBankMember |  |
Loans Sold or Securitized with Recourse |  |  |
Guarantees |  |  |
Principal amount of loans sold or securitized | 237,700,000 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / us-gaap_GuaranteeObligationsByNatureAxis = ewbc_LoansSoldOrSecuritizedWithRecourseMember |  | 249,800,000 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / us-gaap_GuaranteeObligationsByNatureAxis = ewbc_LoansSoldOrSecuritizedWithRecourseMember
Recourse reserve | 673,000 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = ewbc_LoansSoldOrSecuritizedWithRecourseMember |  | 2,200,000 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = ewbc_LoansSoldOrSecuritizedWithRecourseMember
Loans Sold or Securitized with Full Recourse | Residential | Single-family |  |  |
Guarantees |  |  |
Principal amount of loans sold or securitized | 34,300,000 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_GuaranteeObligationsByNatureAxis = ewbc_LoansSoldOrSecuritizedWithFullRecourseMember |  | 35,500,000 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_GuaranteeObligationsByNatureAxis = ewbc_LoansSoldOrSecuritizedWithFullRecourseMember
Loans Sold or Securitized with Limited Recourse | Residential | Multifamily |  |  |
Guarantees |  |  |
Principal amount of loans sold or securitized | $ 203,400,000 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_GuaranteeObligationsByNatureAxis = ewbc_LoansSoldOrSecuritizedWithLimitedRecourseMember |  | $ 214,300,000 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_GuaranteeObligationsByNatureAxis = ewbc_LoansSoldOrSecuritizedWithLimitedRecourseMember
Recourse provision limitation, maximum percentage of the top loss on the multifamily loans | 4.00%ewbc_PercentageLimitOfRecourseOnMultiFamilyLoans / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_GuaranteeObligationsByNatureAxis = ewbc_LoansSoldOrSecuritizedWithLimitedRecourseMember |  |

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- Definition Represents the maximum percentage of the top loss on the multifamily loans with limited recourse. + References No definition available. + Details
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- Definition This is the principal amount outstanding for sold or securitized loans only (across all types of loans). + References No definition available. + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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