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DERIVATIVES (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Designated as Hedging Instrument |  |  |  |
Fair Values of Derivative Instruments |  |  |  |
Notional amount | $ 132,667 invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | $ 135,000 invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Derivative liabilities | 9,922 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [1] | 16,906 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [1]
Designated as Hedging Instrument | Interest rate swaps on certificates of deposits |  |  |  |
Fair Values of Derivative Instruments |  |  |  |
Notional amount | 132,667 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | 135,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Derivative liabilities | 9,922 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [1] | 16,906 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | [1]
Derivative instruments not designated as hedging instruments |  |  |  |
Fair Values of Derivative Instruments |  |  |  |
Notional amount | 5,672,472 invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 4,606,619 invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Derivative assets | 55,793 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 40,549 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Derivative liabilities | 54,342 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | 33,356 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Derivative instruments not designated as hedging instruments | Foreign exchange options |  |  |  |
Fair Values of Derivative Instruments |  |  |  |
Notional amount | 85,614 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 85,614 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Derivative assets | 6,136 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 6,290 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Derivative instruments not designated as hedging instruments | Embedded derivatives liabilities |  |  |  |
Fair Values of Derivative Instruments |  |  |  |
Notional amount | 47,838 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 51,505 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Derivative liabilities | 3,392 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | 3,655 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Derivative instruments not designated as hedging instruments | Interest rate swaps and caps |  |  |  |
Fair Values of Derivative Instruments |  |  |  |
Notional amount | 4,858,391 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapAndCapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 3,834,072 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapAndCapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Derivative assets | 41,534 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapAndCapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 28,078 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapAndCapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Derivative liabilities | 41,779 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapAndCapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | 26,352 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapAndCapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Derivative instruments not designated as hedging instruments | Foreign exchange contracts |  |  |  |
Fair Values of Derivative Instruments |  |  |  |
Notional amount | 680,629 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 635,428 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Derivative assets | 8,123 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 6,181 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Derivative liabilities | $ 9,171 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | $ 3,349 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
[1] | Derivative assets are included in other assets. Derivative liabilities are included in other liabilities and deposits.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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