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DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2010 | Mar. 31, 2015 | Dec. 31, 2014
Foreign exchange options |  |  |
Derivatives |  |  |
Term of contract | 5 years |  |
Interest rate swaps and caps |  |  |
Derivatives |  |  |
Notional amount of derivative assets |  | $ 2,600,000,000 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_InterestRateSwapAndCapMember | $ 2,450,000,000 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_InterestRateSwapAndCapMember
Notional amount of derivative liabilities |  | 2,600,000,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_InterestRateSwapAndCapMember | 2,400,000,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_InterestRateSwapAndCapMember
Short-term foreign exchange contracts |  |  |
Derivatives |  |  |
Notional Amount |  | 1,040,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember | 680,600,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember
Fair value of derivative asset |  | 13,300,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember | 8,100,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember
Fair value of derivative liability |  | $ 13,100,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember | $ 9,200,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember

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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 Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + 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 Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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