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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
Amount of securities sold under repurchase agreements
Total	$ 995,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross	$ 995,000us-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	245,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesInYearOneMember
Maturities in 2016
Amount of securities sold under repurchase agreements
Total	250,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesInYearTwoMember
Maturities in 2017
Amount of securities sold under repurchase agreements
Total	50,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesInYearThreeMember
Maturities in 2018
Amount of securities sold under repurchase agreements
Total	0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesInYearFourMember
Maturities in 2019
Amount of securities sold under repurchase agreements
Total	0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesInYearFiveMember
Maturities in 2020 and thereafter
Amount of securities sold under repurchase agreements
Total	$ 450,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = ewbc_MaturitiesThereafterMember

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- Definition

Interest rate associated with the assets sold under agreements to repurchase.

+ References

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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

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