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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 6) (Non-covered loans, USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
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Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012
Troubled debt restructuring disclosures |  |  |
Number of notes into which A/B notes are split | 2 ewbc_FinancingReceivableRestructuredNoteSplitNumber |  |
CRE |  |  |
Troubled debt restructuring disclosures |  |  |
Loan balance of restructured loans | 8,600 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | $ 17,500 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | $ 9,200 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
C&I |  |  |
Troubled debt restructuring disclosures |  |  |
Loan balance of restructured loans | 3,200 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 15,600 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 5,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Residential |  |  |
Troubled debt restructuring disclosures |  |  |
Loan balance of restructured loans | 12,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 1,100 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 33,700 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Consumer |  |  |
Troubled debt restructuring disclosures |  |  |
Loan balance of restructured loans | 504 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | $ 639 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | $ 108 us-gaap_FinancingReceivableModificationsRecordedInvestment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember

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- Definition The number of notes the original note is split into in an A/B note restructuring. + References No definition available. + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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