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DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (Interest rate swaps on certificates of deposits, USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivatives |  |
Notional amount terminated | $ 3,600,000 ewbc_DerivativeNotionalAmountTerminated |
Interest Expense |  |
Net gains (losses) recognized in the Income Statement |  |
Gains (losses) recognized on interest rate swaps | 3,048,000 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember | 2,704,000 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember
Net amount recognized on fair value hedges (ineffective portion) | 353,000 us-gaap_DerivativeNetHedgeIneffectivenessGainLoss / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember | (233,000)us-gaap_DerivativeNetHedgeIneffectivenessGainLoss / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember
Reduction in interest expense recognized on interest rate swaps | 920,000 us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember | 1,824,000 us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember
Interest Expense | Certificates of deposits |  |
Net gains (losses) recognized in the Income Statement |  |
Gains (losses) recognized on certificates of deposit | $ (2,695,000)us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember | $ (2,937,000)us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_DerivativeInstrumentRiskAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember

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- Definition Aggregate notional amount of derivatives terminated during the period. Expressed as an absolute value. + References No definition available. + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of gain (loss) from the ineffectiveness of the hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Net gain (loss) relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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