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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 5) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
OREO |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Increase (decrease) in value of assets | $ (277)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByAssetClassAxis = ewbc_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | $ (526)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByAssetClassAxis = ewbc_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Loans Receivable | Non-PCI loans |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Increase (decrease) in value of assets | (1,868)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | (7,359)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Loans Receivable | Non-PCI loans | CRE |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Increase (decrease) in value of assets | 841 ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | (464)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Loans Receivable | Non-PCI loans | C&I |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Increase (decrease) in value of assets | (2,470)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember | (6,530)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
Loans Receivable | Non-PCI loans | Residential |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Increase (decrease) in value of assets | $ (239)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember | $ (365)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember

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- Details
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