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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Credit Extensions |  |
Allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision | $ 15,600,000 ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision | $ 12,700,000 ewbc_AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision
Undisbursed Loan Commitments |  |
Credit Extensions |  |
Loan | 3,710,000,000 ewbc_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember | 3,870,000,000 ewbc_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Commercial and Standby Letters of Credit |  |
Credit Extensions |  |
Commercial and standby letters of credit issued | $ 1,440,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_FinancialInstrumentAxis = ewbc_CommercialAndStandbyLettersOfCreditMember | $ 1,250,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_FinancialInstrumentAxis = ewbc_CommercialAndStandbyLettersOfCreditMember

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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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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at fixed and variable interest rates. + References No definition available. + Details
Name: | ewbc_LoansAndLeasesReceivableCommitments
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentAxis=ewbc_CommercialAndStandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |