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SECURITIES PURCHASED UNDER RESALE AGREEMENTS AND SOLD UNDER REPURCHASE AGREEMENTS (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Amount of securities sold under repurchase agreements |  |
Total | $ 995,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross | $ 995,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Interest rate on securities sold under repurchase agreements |  |
Total (as a percent) | 3.70%ewbc_AssetsSoldUnderAgreementsToRepurchaseInterestRateCustom | 4.06%ewbc_AssetsSoldUnderAgreementsToRepurchaseInterestRateCustom
Maturities in 2015 |  |
Amount of securities sold under repurchase agreements |  |
Total | 245,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesInYearOneMember |
Maturities in 2016 |  |
Amount of securities sold under repurchase agreements |  |
Total | 250,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesInYearTwoMember |
Maturities in 2017 |  |
Amount of securities sold under repurchase agreements |  |
Total | 50,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesInYearThreeMember |
Maturities in 2018 |  |
Amount of securities sold under repurchase agreements |  |
Total | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesInYearFourMember |
Maturities in 2019 |  |
Amount of securities sold under repurchase agreements |  |
Total | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesInYearFiveMember |
Maturities in 2020 and thereafter |  |
Amount of securities sold under repurchase agreements |  |
Total | $ 450,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesThereafterMember |

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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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