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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 5) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Covered OREO |  |  |  |  |  |
Percentage of company's liability for losses under shared loss agreements | 20.00%ewbc_PercentageOfCompanysLiabilityForLossesUnderSharedLossAgreements |  | 20.00%ewbc_PercentageOfCompanysLiabilityForLossesUnderSharedLossAgreements |  | 20.00%ewbc_PercentageOfCompanysLiabilityForLossesUnderSharedLossAgreements |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00%ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse |  | 80.00%ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse |  | 80.00%ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse |
Fair Value, Measurements, Nonrecurring |  |  |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |  |  |
Increase (decrease) in value of assets | (7,035)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | (18,875)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | (28,012)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Company's liability for losses under shared loss agreements | 205 ewbc_PortionOfLossesNotReimbursedToCompanyCoveredOtherRealEstateOwned / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 675 ewbc_PortionOfLossesNotReimbursedToCompanyCoveredOtherRealEstateOwned / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 2,200 ewbc_PortionOfLossesNotReimbursedToCompanyCoveredOtherRealEstateOwned / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Fair Value, Measurements, Nonrecurring | Non-covered OREO |  |  |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |  |  |
Increase (decrease) in value of assets | (1,573)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember |  | (1,438)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember |  | (5,122)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_NonCoveredOREOMember |
Fair Value, Measurements, Nonrecurring | Covered OREO |  |  |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |  |  |
Increase (decrease) in value of assets | (1,027)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CoveredOREOMember | [1] | (3,376)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CoveredOREOMember | [1] | (11,183)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CoveredOREOMember | [1]
Fair Value, Measurements, Nonrecurring | CRE |  |  |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |  |  |
Increase (decrease) in value of assets | 2,196 ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | (4,250)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | (8,405)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Fair Value, Measurements, Nonrecurring | C&I |  |  |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |  |  |
Increase (decrease) in value of assets | (9,169)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | (13,135)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | (14,540)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |
Fair Value, Measurements, Nonrecurring | Residential |  |  |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |  |  |
Increase (decrease) in value of assets | (61)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | (1,378)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | (4,803)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |
Fair Value, Measurements, Nonrecurring | Consumer |  |  |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |  |  |
Increase (decrease) in value of assets | (1)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  | (112)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  | (264)ewbc_GainLossRecognizedInIncomeStatementForAssetsMeasuredOnNonrecurringBasis / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |
[1] | Covered OREO results from the WFIB and UCB FDIC-assisted acquisitions for which the Company entered into shared-loss agreements with the FDIC whereby the FDIC will reimburse the Company for 80% of eligible losses. As such, the Company's liability for losses is 20% of the $1.0 million in losses, or $205 thousand, and 20% of the $3.4 million in losses, or $675 thousand, and 20% of the $11.2 million in losses, or $2.2 million for the years ended December 31, 2014, 2013, and 2012, respectively.

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- Definition Amount of gain (loss) recognized in the income statement for an asset measured on a nonrecurring basis. + References No definition available. + Details
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- Definition The percentage of losses related to other real estate owned for which the company retains liability. + References No definition available. + Details
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- Definition Percentage of eligible losses for which the FDIC is obligated to reimburse the Company pursuant to the shared-loss agreements. + References No definition available. + Details
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- Definition The portion of eligible losses during the period for which the company will not be reimbursed under shared-loss agreements, related to covered other real estate owned. + References No definition available. + Details
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