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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Non-Covered loans receivable disclosures |  |  |  |
Allowance for loan losses on non-covered loans | $ (258,174)us-gaap_LoansAndLeasesReceivableAllowance |  | $ (241,930)us-gaap_LoansAndLeasesReceivableAllowance |
Non-covered loans receivable, excluding covered loans, net | 19,994,081 us-gaap_LoansAndLeasesReceivableNetReportedAmount |  | 15,412,715 us-gaap_LoansAndLeasesReceivableNetReportedAmount |
Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 20,249,451 ewbc_NoncoveredLoansReceivableGross / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | [1] | 15,678,317 ewbc_NoncoveredLoansReceivableGross / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | [1]
Unearned fees, premiums and discounts, net | 2,804 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | (23,672)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Allowance for loan losses on non-covered loans | (258,174)us-gaap_LoansAndLeasesReceivableAllowance / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | (241,930)us-gaap_LoansAndLeasesReceivableAllowance / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Non-covered loans receivable, excluding covered loans, net | 19,994,081 us-gaap_LoansAndLeasesReceivableNetReportedAmount / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 15,412,715 us-gaap_LoansAndLeasesReceivableNetReportedAmount / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 6,134,046 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 4,585,077 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Income producing | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 5,611,485 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 4,301,030 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_IncomeProducingFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Construction | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 313,811 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 140,186 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
CRE | Land | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 208,750 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_LandCommercialRealEstateMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 143,861 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_LandCommercialRealEstateMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 7,838,094 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 5,360,193 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Commercial business | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 7,031,350 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 4,637,056 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_CommercialBusinessMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
C&I | Trade finance | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 806,744 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_TradeFinanceMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 723,137 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_TradeFinanceMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 4,820,668 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 4,185,309 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Single-family | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 3,642,978 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 3,192,875 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Residential | Multifamily | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 1,177,690 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 992,434 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialMultifamilyMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | 1,456,643 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | 1,547,738 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Student loans | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans |  |  | 679,220 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_StudentLoansMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
Consumer | Other Consumer | Non-covered loans |  |  |  |
Non-Covered loans receivable disclosures |  |  |  |
Non-Covered Loans | $ 1,456,643 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |  | $ 868,518 ewbc_NoncoveredLoansReceivableGross / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember |
[1] | Loans net of ASC 310-30 discount.

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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