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DERIVATIVES (Details 2) (Interest rate swaps on certificates of deposits, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Values of Derivative Instruments |  |  |
Gains (Losses) recognized on interest rate swaps | $ 6,885 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 | $ (9,255)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 | $ (1,076)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
Net amount recognized on fair value hedges (ineffective portion) | 101 us-gaap_DerivativeNetHedgeIneffectivenessGainLoss | 420 us-gaap_DerivativeNetHedgeIneffectivenessGainLoss | 3,610 us-gaap_DerivativeNetHedgeIneffectivenessGainLoss
Net interest expense recognized on interest rate swaps | (6,703)us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet | (3,153)us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet | (3,793)us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet
Certificates of deposits |  |  |
Fair Values of Derivative Instruments |  |  |
Gains (Losses) recognized on interest rate swaps | $ (6,784)us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_IncomeStatementLocationAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember | $ 9,675 us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_IncomeStatementLocationAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember | $ 4,686 us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_IncomeStatementLocationAxis = ewbc_InterestRateSwapsOnCertificatesOfDepositsMember

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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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