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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 14) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Allowance for Unfunded Loan Commitments, Off-Balance Sheet Credit Exposures and Recourse Provisions |  |
Allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision | $ 12,700,000 ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision | $ 11,300,000 ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision
Non-covered loans |  |
Allowance for Unfunded Loan Commitments, Off-Balance Sheet Credit Exposures and Recourse Provisions |  |
Allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision | 12,700,000 ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 11,300,000 ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Off-balance sheet loans serviced for others | 1,190,000,000 us-gaap_DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | 1,350,000,000 us-gaap_DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember
Portion of allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provisions related to off-balance sheet loans sold and securitized | $ 2,200,000 ewbc_PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansSoldAndSecuritized / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember | $ 3,200,000 ewbc_PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansSoldAndSecuritized / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_NonCoveredLoansMember

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- Definition Represents the allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision of the entity. + References No definition available. + Details
Name: | ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ewbc_AllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsAbstract
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The portion of the allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provisions specifically related to off-balance sheet loans sold and securitized. + References No definition available. + Details
Name: | ewbc_PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansSoldAndSecuritized
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 + Details
Name: | us-gaap_DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |