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

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- Definition Weighted average interest rate on the amount to be repaid by the counterparty to the resale agreement. + References No definition available. + Details
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- Definition Amount of maturities, in year five following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount of maturities, in year four following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount of maturities, in year one following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount of maturities, in year six and thereafter following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount of maturities, in year three following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount of maturities, in year two following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets 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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