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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 13) (Non-covered loans, USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Recorded investment in total loans receivable related to each balance in the allowance for loan losses |  |
Individually evaluated for impairment | $ 154,120 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | $ 183,477 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Collectively evaluated for impairment | 19,997,601 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment | 15,494,840 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Acquired with deteriorated credit quality | 97,730 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality |
Ending balance | 20,249,451 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | 15,678,317 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
CRE |  |
Recorded investment in total loans receivable related to each balance in the allowance for loan losses |  |
Individually evaluated for impairment | 65,393 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 84,436 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Collectively evaluated for impairment | 5,977,437 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 4,500,641 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Acquired with deteriorated credit quality | 91,216 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Ending balance | 6,134,046 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 4,585,077 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
C&I |  |
Recorded investment in total loans receivable related to each balance in the allowance for loan losses |  |
Individually evaluated for impairment | 36,543 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 39,527 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Collectively evaluated for impairment | 7,796,239 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 5,320,666 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Acquired with deteriorated credit quality | 5,312 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Ending balance | 7,838,094 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 5,360,193 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Residential |  |
Recorded investment in total loans receivable related to each balance in the allowance for loan losses |  |
Individually evaluated for impairment | 50,925 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 56,287 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Collectively evaluated for impairment | 4,768,541 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 4,129,022 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Acquired with deteriorated credit quality | 1,202 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Ending balance | 4,820,668 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 4,185,309 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Consumer |  |
Recorded investment in total loans receivable related to each balance in the allowance for loan losses |  |
Individually evaluated for impairment | 1,259 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 3,227 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Collectively evaluated for impairment | 1,455,384 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 1,544,511 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Acquired with deteriorated credit quality | 0 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Ending balance | $ 1,456,643 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | $ 1,547,738 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember

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- Definition The balance of financing receivables that were acquired with deteriorated credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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