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DERIVATIVES (Details 3) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2007 item | Dec. 31, 2013
Foreign exchange options |  |  |
Derivative |  |  |
Term of contract | 5 years |  |
Interest rate swaps and caps |  |  |
Derivative |  |  |
Notional amount of derivative assets | 2,450,000,000 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_InterestRateSwapAndCapMember |  | $ 1,920,000,000 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_InterestRateSwapAndCapMember
Notional amount of derivative liabilities | 2,400,000,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_InterestRateSwapAndCapMember |  | 1,910,000,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_InterestRateSwapAndCapMember
Short-term foreign exchange contracts |  |  |
Derivative |  |  |
Notional amount | 680,600,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember |  | 607,900,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember
Fair value of derivative asset | 8,100,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember |  | 6,200,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember
Fair value of derivative liability | 9,200,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember |  | 3,300,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeByNatureAxis = ewbc_ShortTermForeignExchangeMember
Long-term foreign exchange contracts |  |  |
Derivative |  |  |
Notional amount |  |  | 27,500,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = ewbc_LongTermForeignExchangeMember
Fair value of derivative asset |  |  | 200,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = ewbc_LongTermForeignExchangeMember
Fair value of derivative liability |  |  | $ 183,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeByNatureAxis = ewbc_LongTermForeignExchangeMember
Equity swap agreements |  |  |
Derivative |  |  |
Number of instruments entered into during the period |  | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = us-gaap_EquitySwapMember |
Term of contract |  | 5 years |

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