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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 18, 2014
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Other Commitments |  |  |
Other Commitments | $ 114.7 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments | $ 73.1 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments |
Loans Sold or Securitized with Recourse |  |  |
Guarantees |  |  |
Principal amount of single-family loans with full recourse sold or securitized | 35.5 ewbc_PrincipalAmountOutstandingOnSingleFamilyLoansWithFullRecourseSoldOrSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember | 42.2 ewbc_PrincipalAmountOutstandingOnSingleFamilyLoansWithFullRecourseSoldOrSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Principal amount of multifamily loans with limited recourse sold or securitized | 214.3 ewbc_PrincipalAmountOutstandingOnMultiFamilyLoansWithLimitedRecourseSoldOrSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember | 296.6 ewbc_PrincipalAmountOutstandingOnMultiFamilyLoansWithLimitedRecourseSoldOrSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Principal amount of loans sold or securitized | 249.8 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember | 338.8 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Recourse provision limitation, maximum percentage of the top loss on the multifamily loans | 4.00%ewbc_PercentageLimitOfRecourseOnMultiFamilyLoans / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |  |
Recourse reserve related to loan sales and securitizations totaled | 2.2 ewbc_PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansSoldAndSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember | 3.2 ewbc_PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansSoldAndSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |
Commitment to repurchase the loan | 0 us-gaap_OtherCommitment / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |  |
Loans Sold without Recourse |  |  |
Guarantees |  |  |
Principal amount of loans sold or securitized | 781.4 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = ewbc_LoansSoldWithoutRecourseMember | 818.2 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = ewbc_LoansSoldWithoutRecourseMember |
Loans Securitized without Recourse |  |  |
Guarantees |  |  |
Principal amount of loans sold or securitized | 162.8 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = ewbc_LoansSecuritizedWithoutRecourseMember | 193.8 ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized / us-gaap_LossContingenciesByNatureOfContingencyAxis = ewbc_LoansSecuritizedWithoutRecourseMember |
F&F, LLC and 618 Investment, Inc. v. East West Bank |  |  |
Litigation |  |  |
Interim adjusted amount of the verdict |  |  | 36.6 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LitigationCaseAxis = ewbc_FAndFLLCAnd618InvestmentIncVEastWestBankMember
East West Bank | F&F, LLC and 618 Investment, Inc. v. East West Bank |  |  |
Litigation |  |  |
Litigation accrual | $ 31.6 us-gaap_LossContingencyAccrualAtCarryingValue / dei_LegalEntityAxis = ewbc_EastWestBankMember / us-gaap_LitigationCaseAxis = ewbc_FAndFLLCAnd618InvestmentIncVEastWestBankMember |  |

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