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SECURITIES PURCHASED UNDER RESALE AGREEMENTS AND SOLD UNDER REPURCHASE AGREEMENTS (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Resale agreements    
Total $ 1,425,000,000us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross $ 1,400,000,000us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross
Maturities in 2015 875,000,000ewbc_SecuritiesPurchasedUnderAgreementsToResellGrossMaturitiesInYearOne  
Maturities in 2016 0ewbc_SecuritiesPurchasedUnderAgreementsToResellGrossMaturitiesInYearTwo  
Maturities in 2017 0ewbc_SecuritiesPurchasedUnderAgreementsToResellGrossMaturitiesInYearThree  
Maturities in 2018 50,000,000ewbc_SecuritiesPurchasedUnderAgreementsToResellGrossMaturitiesInYearFour  
Maturities in 2019 0ewbc_SecuritiesPurchasedUnderAgreementsToResellGrossMaturitiesInYearFive  
Maturities in 2020 and thereafter $ 500,000,000ewbc_SecuritiesPurchasedUnderAgreementsToResellGrossMaturitiesInYearSixAndThereafter  
Weighted average interest rates 1.55%ewbc_AssetsPurchasedUnderAgreementsToResellInterestRate 1.44%ewbc_AssetsPurchasedUnderAgreementsToResellInterestRate