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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 4) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value, Assets Measured on a Nonrecurring Basis |  |
OREO | $ 1,676 ewbc_OtherRealEstateOwnedFairValueDisclosure | $ 17,521 ewbc_OtherRealEstateOwnedFairValueDisclosure
Loans Receivable | Non-PCI loans |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Impaired loans | 39,417 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 67,811 us-gaap_LoansReceivableFairValueDisclosure / 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 |  |
Impaired loans | 13,648 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 26,089 us-gaap_LoansReceivableFairValueDisclosure / 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 |  |
Impaired loans | 11,356 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember | 16,581 us-gaap_LoansReceivableFairValueDisclosure / 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 |  |
Impaired loans | 14,306 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember | 25,034 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Loans Receivable | Non-PCI loans | Consumer |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Impaired loans | 107 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember | 107 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
OREO | 1,676 ewbc_OtherRealEstateOwnedFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 17,521 ewbc_OtherRealEstateOwnedFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI loans |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Impaired loans | 39,417 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 67,811 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI loans | CRE |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Impaired loans | 13,648 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 26,089 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI loans | C&I |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Impaired loans | 11,356 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember | 16,581 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI loans | Residential |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Impaired loans | 14,306 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember | 25,034 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI loans | Consumer |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Impaired loans | $ 107 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember | $ 107 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember

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- Definition Fair value portion of other real estate owned. + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant