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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 6) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Quantitative information |  |  |  |
OREO | 1,676 ewbc_OtherRealEstateOwnedFairValueDisclosure |  | 17,521 ewbc_OtherRealEstateOwnedFairValueDisclosure |
Significant Unobservable Inputs (Level 3) |  |  |  |
Quantitative information |  |  |  |
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 |
OREO | Appraisal | Significant Unobservable Inputs (Level 3) |  |  |  |
Quantitative information |  |  |  |
OREO | 1,676 ewbc_OtherRealEstateOwnedFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ewbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ValuationTechniqueAxis = ewbc_AppraisalValuationTechniqueMember |  | 17,521 ewbc_OtherRealEstateOwnedFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ewbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ValuationTechniqueAxis = ewbc_AppraisalValuationTechniqueMember |
OREO | Appraisal | Significant Unobservable Inputs (Level 3) | Weighted Average |  |  |  |
Quantitative information |  |  |  |
Selling cost (as a percent) | 8.00%ewbc_FairValueInputsSellingCost / us-gaap_FairValueByAssetClassAxis = ewbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ewbc_AppraisalValuationTechniqueMember |  | 8.00%ewbc_FairValueInputsSellingCost / us-gaap_FairValueByAssetClassAxis = ewbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ewbc_AppraisalValuationTechniqueMember |
Loans Receivable | Non-PCI loans |  |  |  |
Quantitative information |  |  |  |
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 | Significant Unobservable Inputs (Level 3) |  |  |  |
Quantitative information |  |  |  |
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 |
Loans Receivable | Non-PCI loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) |  |  |  |
Quantitative information |  |  |  |
Impaired loans | 3,578 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 / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |  | 11,499 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 / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |
Loans Receivable | Non-PCI loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Minimum |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |  | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |
Loans Receivable | Non-PCI loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Maximum |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 86.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |  | 81.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |
Loans Receivable | Non-PCI loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Weighted Average |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 58.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |  | 49.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |
Loans Receivable | Non-PCI loans | Market comparables | Significant Unobservable Inputs (Level 3) |  |  |  |
Quantitative information |  |  |  |
Impaired loans | 35,839 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 / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |  | 56,312 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 / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |
Loans Receivable | Non-PCI loans | Market comparables | Significant Unobservable Inputs (Level 3) | Minimum |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1] | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1]
Loans Receivable | Non-PCI loans | Market comparables | Significant Unobservable Inputs (Level 3) | Maximum |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 100.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1] | 100.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1]
Loans Receivable | Non-PCI loans | Market comparables | Significant Unobservable Inputs (Level 3) | Weighted Average |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 7.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1] | 4.00%us-gaap_FairValueInputsDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1]
[1] | Discount rate is adjusted for factors such as liquidation cost of collateral and selling cost.

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- Definition Fair value portion of other real estate owned. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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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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