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COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Carrying Amounts And Composition Of Covered Loans |  |  |  |
Allowance for loan losses on covered loans | $ (3,505)us-gaap_LoansAndLeasesReceivableAllowanceCovered |  | $ (7,745)us-gaap_LoansAndLeasesReceivableAllowanceCovered |
Total covered loans, net | 1,474,189 us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered |  | 2,187,898 us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered |
Covered Loans |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 1,604,940 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember | [1] | 2,461,560 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember | [2]
Covered discount | (127,246)ewbc_CoveredDiscount / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | (265,917)ewbc_CoveredDiscount / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Net valuation of loans | 1,477,694 ewbc_NetValuationOfLoans / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 2,195,643 ewbc_NetValuationOfLoans / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Allowance for loan losses on covered loans | (3,505)us-gaap_LoansAndLeasesReceivableAllowanceCovered / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | (7,745)us-gaap_LoansAndLeasesReceivableAllowanceCovered / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Total covered loans, net | 1,474,189 us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 2,187,898 us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Collectively evaluated for impairment | 253,312 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember | [1] | 320,185 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember | [2]
Acquired with deteriorated credit quality | 1,224,382 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 1,875,458 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | Covered Advances |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 253,300 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 320,200 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Collectively evaluated for impairment | 253,300 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 320,200 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | CRE |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 751,719 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 1,267,363 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | CRE | Covered Advances |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 59,400 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 46,700 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Collectively evaluated for impairment | 59,400 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 46,700 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | CRE | CRE |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 705,665 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialAndIndustrialRealEstateMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 1,103,530 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialAndIndustrialRealEstateMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | CRE | Construction and land |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 46,054 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ConstructionAndLandMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 163,833 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ConstructionAndLandMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | C&I |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 252,986 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 426,621 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | C&I | Covered Advances |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 154,800 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 230,600 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Collectively evaluated for impairment | 154,800 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 230,600 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | Residential |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 537,249 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 693,603 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | Residential | Covered Advances |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 11,800 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 12,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Collectively evaluated for impairment | 11,800 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 12,000 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | Residential | Single-family |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 240,650 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 290,095 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | Residential | Multifamily |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 296,599 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 403,508 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | Consumer | Covered Advances |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | 27,300 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 30,900 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Collectively evaluated for impairment | 27,300 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 30,900 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_CoveredAdvancesMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | Consumer | Other Consumer |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total covered loans | $ 62,986 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | $ 73,973 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
[1] | Includes $253.3 million of covered advances comprised of $154.8 million, $59.4 million, $27.3 million and $11.8 million of C&I, CRE, consumer and residential loans, respectively.
[2] | Includes $320.2 million of covered advances comprised of $230.6 million, $46.7 million, $30.9 million and $12.0 million of C&I, CRE, consumer and residential loans, respectively.

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