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SECURITIES PURCHASED UNDER RESALE AGREEMENTS AND SOLD UNDER REPURCHASE AGREEMENTS (Details 3) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Assets, Resale Agreements    
Gross Amounts of Recognized Assets $ 1,425,000,000us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross $ 1,400,000,000us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross
Gross Amounts Offset on the Consolidated Balance Sheet (200,000,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability  
Net Amounts of Assets Presented 1,225,000,000us-gaap_SecuritiesPurchasedUnderAgreementsToResell 1,300,000,000us-gaap_SecuritiesPurchasedUnderAgreementsToResell [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets    
Financial Instruments (425,000,000)ewbc_SecuritiesPurchasedUnderAgreementsToResellNotOffset (495,000,000)ewbc_SecuritiesPurchasedUnderAgreementsToResellNotOffset
Collateral Received (797,172,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities (905,000,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities
Net Amount 2,828,000us-gaap_SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral  
Liabilities, Repurchase Agreements    
Gross Amounts of Recognized Liabilities 995,000,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross 995,000,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Gross Amounts Offset on the Consolidated Balance Sheets (200,000,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset  
Net Amounts of Liabilities Presented 795,000,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase 995,000,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Gross Amounts Not Offset in the Consolidated Balance Sheets    
Financial Instruments (425,000,000)ewbc_SecuritiesSoldUnderAgreementsToRepurchaseNotOffset (495,000,000)ewbc_SecuritiesSoldUnderAgreementsToRepurchaseNotOffset
Collateral Posted (370,000,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities (500,000,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Amount recorded in cash and cash equivalents   $ 100,000,000ewbc_SecuritiesPurchasedUnderAgreementsToResellRecordedInCashAndCashEquivalents
[1] Of the $1.40 billion resale agreements as of December 31, 2013, $100.0 million was recorded in cash and cash equivalents and $1.3 billion was recorded in securities under resale agreements in the consolidated balance sheet.