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SECURITIES PURCHASED UNDER RESALE AGREEMENTS AND SOLD UNDER REPURCHASE AGREEMENTS (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Assets, Resale Agreements |  |  |  |
Gross Amounts of Recognized Assets | $ 1,850,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross |  | $ 1,425,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross |
Gross Amounts Offset on the Consolidated Balance Sheet | (300,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability |  | (200,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability |
Net Amounts of Assets Presented | 1,550,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResell |  | 1,225,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResell |
Gross Amounts Not Offset on the Consolidated Balance Sheet |  |  |  |
Financial Instruments | (350,000)ewbc_SecuritiesPurchasedUnderAgreementsToResellNotOffset | [1] | (425,000)ewbc_SecuritiesPurchasedUnderAgreementsToResellNotOffset | [1]
Collateral Received | (1,195,203)us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities | [2] | (797,172)us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities | [2]
Net Amount | 4,797 us-gaap_SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral |  | 2,828 us-gaap_SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral |
Liabilities, Repurchase Agreements |  |  |  |
Gross Amounts of Recognized Liabilities | 995,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross |  | 995,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross |
Gross Amounts Offset on the Consolidated Balance Sheet | (300,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset |  | (200,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset |
Net Amounts of Liabilities Presented | 695,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase |  | 795,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase |
Gross Amounts Not Offset on the Consolidated Balance Sheet |  |  |  |
Financial Instruments | (350,000)ewbc_SecuritiesSoldUnderAgreementsToRepurchaseNotOffset | [1] | (425,000)ewbc_SecuritiesSoldUnderAgreementsToRepurchaseNotOffset | [1]
Collateral Posted | $ (345,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities | [3] | $ (370,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities | [3]
[1] | Includes financial instruments subject to enforceable master netting arrangements that are not permitted to be offset under ASC 210-20-45 but would be eligible for offsetting to the extent an event of default has occurred.
[2] | Represents the fair value of securities the Company has received under resale agreements, limited for table presentation purposes to the amount of the recognized asset due from each counterparty.
[3] | Represents the fair value of securities the Company has pledged under repurchase agreements, limited for table presentation purposes to the amount of the recognized liability owed to each counterparty.

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