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

X

- 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)

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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)

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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



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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

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