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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 4) (Non-covered loans, USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 item | Dec. 31, 2013
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Credit Quality Indicators |  |  |  |
Number of grades in the risk rating system utilized by the company to rate credit risk of loans receivable | 8 ewbc_NumberOfGradesRiskRatingSystem |  |  |
Total non-covered loans | $ 20,249,451 ewbc_NoncoveredLoansReceivableGross | [1] | $ 15,678,317 ewbc_NoncoveredLoansReceivableGross | [1]
Pass/Watch |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 19,453,512 ewbc_NoncoveredLoansReceivableGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 14,991,479 ewbc_NoncoveredLoansReceivableGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Special Mention |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 208,175 ewbc_NoncoveredLoansReceivableGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 197,284 ewbc_NoncoveredLoansReceivableGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Substandard |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 587,176 ewbc_NoncoveredLoansReceivableGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 489,554 ewbc_NoncoveredLoansReceivableGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Doubtful |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 533 ewbc_NoncoveredLoansReceivableGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  |  |
Loss |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 55 ewbc_NoncoveredLoansReceivableGross / us-gaap_InternalCreditAssessmentAxis = ewbc_LossMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  |  |
CRE |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 6,134,046 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 4,585,077 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Construction |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 313,811 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 140,186 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Construction | Pass/Watch |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 306,923 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 127,138 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Construction | Special Mention |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans |  |  | 6,160 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Construction | Substandard |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 6,888 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 6,888 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Land |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 208,750 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_LandCommercialRealEstateMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 143,861 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_LandCommercialRealEstateMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Land | Pass/Watch |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 179,319 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_LandCommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 116,000 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_LandCommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Land | Special Mention |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 5,701 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_LandCommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 9,304 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_LandCommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Land | Substandard |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 23,730 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_LandCommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 18,557 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_LandCommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Income producing |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 5,611,485 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 4,301,030 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Income producing | Pass/Watch |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 5,244,022 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 4,032,269 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Income producing | Special Mention |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 54,431 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 56,752 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Income producing | Substandard |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 313,032 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 212,009 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 7,838,094 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 5,360,193 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Commercial business |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 7,031,350 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 4,637,056 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Commercial business | Pass/Watch |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 6,783,051 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 4,400,847 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Commercial business | Special Mention |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 128,578 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 92,315 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Commercial business | Substandard |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 119,133 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 143,894 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Commercial business | Doubtful |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 533 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  |  |
C&I | Commercial business | Loss |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 55 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / us-gaap_InternalCreditAssessmentAxis = ewbc_LossMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  |  |
C&I | Trade finance |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 806,744 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_TradeFinanceMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 723,137 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_TradeFinanceMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Trade finance | Pass/Watch |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 766,575 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_TradeFinanceMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 681,345 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_TradeFinanceMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Trade finance | Special Mention |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 10,193 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_TradeFinanceMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 22,099 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_TradeFinanceMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Trade finance | Substandard |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 29,976 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_TradeFinanceMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 19,693 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_TradeFinanceMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 4,820,668 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 4,185,309 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Single-family |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 3,642,978 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 3,192,875 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Single-family | Pass/Watch |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 3,624,097 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 3,167,337 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Single-family | Special Mention |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 3,143 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 8,331 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Single-family | Substandard |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 15,738 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 17,207 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Multifamily |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 1,177,690 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 992,434 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Multifamily | Pass/Watch |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 1,096,572 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 923,697 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Multifamily | Special Mention |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 5,124 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 1,634 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Multifamily | Substandard |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 75,994 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 67,103 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 1,456,643 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 1,547,738 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Student loans |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans |  |  | 679,220 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_StudentLoansMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Student loans | Pass/Watch |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans |  |  | 677,094 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_StudentLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Student loans | Special Mention |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans |  |  | 445 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_StudentLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Student loans | Substandard |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans |  |  | 1,681 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_StudentLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Other Consumer |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 1,456,643 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 868,518 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Other Consumer | Pass/Watch |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 1,452,953 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 865,752 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Other Consumer | Special Mention |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | 1,005 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 244 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Other Consumer | Substandard |  |  |  |
Credit Quality Indicators |  |  |  |
Total non-covered loans | $ 2,685 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | $ 2,522 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
[1] | Loans net of ASC 310-30 discount.

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