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COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 5) (Covered Loans, USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | $ 1,604,940 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered | [1] | $ 2,461,560 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered | [2]
PCI Covered Loans |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Principal Balance | 61,600 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_PurchasedCreditImpairedCoveredLoansMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 129,700 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ewbc_PurchasedCreditImpairedCoveredLoansMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Pass/Watch |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 1,357,240 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 2,003,632 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Special Mention |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 27,428 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 43,604 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Substandard |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 220,272 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 406,855 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Doubtful |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 7,469 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 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 |
CRE | Pass/Watch |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 597,223 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 899,223 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | Special Mention |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 21,090 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 37,323 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | Substandard |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 133,406 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 323,451 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | Doubtful |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 7,366 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | CRE |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 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 |
CRE | CRE | Pass/Watch |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 579,133 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialAndIndustrialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 857,376 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialAndIndustrialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | CRE | Special Mention |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 12,575 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialAndIndustrialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 27,851 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialAndIndustrialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | CRE | Substandard |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 113,957 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialAndIndustrialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 211,835 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialAndIndustrialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | CRE | Doubtful |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialAndIndustrialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 6,468 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialAndIndustrialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | Construction and land |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 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 |
CRE | Construction and land | Pass/Watch |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 18,090 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ConstructionAndLandMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 41,847 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ConstructionAndLandMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | Construction and land | Special Mention |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 8,515 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ConstructionAndLandMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 9,472 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ConstructionAndLandMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | Construction and land | Substandard |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 19,449 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ConstructionAndLandMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 111,616 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ConstructionAndLandMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
CRE | Construction and land | Doubtful |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ConstructionAndLandMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 898 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ConstructionAndLandMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
C&I |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 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 |
C&I | Pass/Watch |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 217,975 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 378,086 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
C&I | Special Mention |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 5,723 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 4,635 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
C&I | Doubtful |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 103 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
C&I | Commercial business | Substandard |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 29,288 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 43,797 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Residential |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 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 |
Residential | Pass/Watch |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 480,032 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 654,270 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Residential | Special Mention |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 474 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 1,518 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Residential | Substandard |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 56,743 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 37,815 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Residential | Single-family |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 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 |
Residential | Single-family | Pass/Watch |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 232,139 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 281,246 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Residential | Single-family | Special Mention |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 474 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 733 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Residential | Single-family | Substandard |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 8,037 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 8,116 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Residential | Multifamily |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 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 |
Residential | Multifamily | Pass/Watch |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 247,893 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 373,024 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Residential | Multifamily | Special Mention |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 785 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Residential | Multifamily | Substandard |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 48,706 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 29,699 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Consumer | Other Consumer |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 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 |
Consumer | Other Consumer | Pass/Watch |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 62,010 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 72,053 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Consumer | Other Consumer | Special Mention |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | 141 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 128 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Consumer | Other Consumer | Substandard |  |  |  |
Carrying Amounts And Composition Of Covered Loans |  |  |  |
Total principal balance | $ 835 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | $ 1,792 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / 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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- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524 + Details
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