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AVAILABLE-FOR-SALE INVESTMENT SECURITIES (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Schedule of Available-for-sale Investment Securities |  |  |
Proceeds from sales | $ 180,501 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | $ 330,231 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities |
Gross realized gains | 4,404 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 3,545 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |
Gross realized losses |  | 127 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | [1]
Related tax expense | 1,850 ewbc_TaxExpenseOnSaleOfAvailableForSaleInvestmentSecurities | 1,436 ewbc_TaxExpenseOnSaleOfAvailableForSaleInvestmentSecurities |
MetroCorp |  |  |
Schedule of Available-for-sale Investment Securities |  |  |
Gross realized losses |  | $ 127 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
[1] | The gross $127 thousand of losses resulted from the available-for-sale 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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- Definition This item represents the gross loss 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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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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