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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 6) (Fair Value, Measurements, Nonrecurring, Significant Unobservable Inputs (Level 3), USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Quantitative information |  |  |  |
Non-covered impaired loans | 67,811 ewbc_LoansReceivableNoncoveredFairValueDisclosure |  | 57,751 ewbc_LoansReceivableNoncoveredFairValueDisclosure |
Non-covered impaired loans | Discounted cash flow |  |  |  |
Quantitative information |  |  |  |
Non-covered impaired loans | 11,499 ewbc_LoansReceivableNoncoveredFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |  |  |
Non-covered impaired loans | Discounted cash flow | Minimum |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |  |  |
Non-covered impaired loans | Discounted cash flow | Maximum |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 81.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |  |  |
Non-covered impaired loans | Discounted cash flow | Weighted Average |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 49.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ewbc_DiscountedCashFlowValuationTechniqueMember |  |  |
Non-covered impaired loans | Market comparables |  |  |  |
Quantitative information |  |  |  |
Non-covered impaired loans | 56,312 ewbc_LoansReceivableNoncoveredFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |  | 57,751 ewbc_LoansReceivableNoncoveredFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |
Non-covered impaired loans | Market comparables | Minimum |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1] | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1]
Non-covered impaired loans | Market comparables | Maximum |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 100.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1] | 100.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1]
Non-covered impaired loans | Market comparables | Weighted Average |  |  |  |
Quantitative information |  |  |  |
Discount rate (as a percent) | 4.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1] | 13.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredImpairedLoanMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1]
Non-covered OREO |  |  |  |
Quantitative information |  |  |  |
Non-covered OREO | 15,735 ewbc_OtherRealEstateOwnedNoncoveredFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember |  | 13,031 ewbc_OtherRealEstateOwnedNoncoveredFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember |
Non-covered OREO | Appraisal |  |  |  |
Quantitative information |  |  |  |
Non-covered OREO | 15,735 ewbc_OtherRealEstateOwnedNoncoveredFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember / us-gaap_ValuationTechniqueAxis = ewbc_AppraisalValuationTechniqueMember |  | 13,031 ewbc_OtherRealEstateOwnedNoncoveredFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember / us-gaap_ValuationTechniqueAxis = ewbc_AppraisalValuationTechniqueMember |
Selling cost (as a percent) | 8.00%ewbc_FairValueInputsSellingCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember / us-gaap_ValuationTechniqueAxis = ewbc_AppraisalValuationTechniqueMember |  | 8.00%ewbc_FairValueInputsSellingCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember / us-gaap_ValuationTechniqueAxis = ewbc_AppraisalValuationTechniqueMember |
Non-covered OREO | Appraisal | Weighted Average |  |  |  |
Quantitative information |  |  |  |
Selling cost (as a percent) | 8.00%ewbc_FairValueInputsSellingCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ewbc_AppraisalValuationTechniqueMember |  | 8.00%ewbc_FairValueInputsSellingCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ewbc_AppraisalValuationTechniqueMember |
Covered OREO |  |  |  |
Quantitative information |  |  |  |
Covered OREO | 1,786 ewbc_OtherRealEstateOwnedCoveredFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CoveredOREOMember |  | 17,284 ewbc_OtherRealEstateOwnedCoveredFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CoveredOREOMember |
[1] | Discount rate is adjusted for factors such as liquidation cost of collateral and selling cost.

X
- Definition Represents selling cost used as an input to measure fair value. + References No definition available. + Details
Name: | ewbc_FairValueInputsSellingCost
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents non-covered loans receivable for which there was a gain or loss recognized in the current period. + References No definition available. + Details
Name: | ewbc_LoansReceivableNoncoveredFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents covered other real estate owned resulting from acquisitions for which the company entered into shared-loss agreements in the current period. + References No definition available. + Details
Name: | ewbc_OtherRealEstateOwnedCoveredFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents non-covered other real estate owned in the current period. + References No definition available. + Details
Name: | ewbc_OtherRealEstateOwnedNoncoveredFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration