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INVESTMENT SECURITIES (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities |  |  |  |
Proceeds from sales | $ 623,689 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities |  | $ 663,569 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | $ 1,230,134 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gross realized gains | 10,978 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |  | 13,904 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 28,211 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses | 127 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | [1] | 1,815 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | 27,454 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Related tax expense | 4,557 ewbc_TaxExpenseOnSaleOfAvailableForSaleInvestmentSecurities |  | 5,077 ewbc_TaxExpenseOnSaleOfAvailableForSaleInvestmentSecurities | 318 ewbc_TaxExpenseOnSaleOfAvailableForSaleInvestmentSecurities
MetroCorp |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Gross realized losses | $ 127 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
[1] | The gross $127 thousand of losses resulted from the investment securities acquired from MetroCorp which were sold immediately after the acquisition closed.

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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