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SECURITIES PURCHASED UNDER RESALE AGREEMENTS AND SOLD UNDER REPURCHASE AGREEMENTS (Details 3) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Assets, Resale Agreements |  |  |
Gross Amounts of Recognized Assets | $ 1,425,000,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross | $ 1,400,000,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross |
Gross Amounts Offset on the Consolidated Balance Sheet | (200,000,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability |  |
Net Amounts of Assets Presented | 1,225,000,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResell | 1,300,000,000 us-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 | 2,828,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral |  |
Liabilities, Repurchase Agreements |  |  |
Gross Amounts of Recognized Liabilities | 995,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross | 995,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross |
Gross Amounts Offset on the Consolidated Balance Sheets | (200,000,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset |  |
Net Amounts of Liabilities Presented | 795,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | 995,000,000 us-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 |  | $ 100,000,000 ewbc_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.

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