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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Credit Extensions |  |
Allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision | $ 11.0 | $ 10.0
Undisbursed Loan Commitments |  |
Credit Extensions |  |
Loan | 2,190.0 | 1,890.0
Mortgage and commercial loan applications in process |  |
Credit Extensions |  |
Loan | 305.6 | 349.9
Commercial and Standby Letters of Credit |  |
Credit Extensions |  |
Commercial and standby letters of credit issued | $ 1,640.0 | $ 768.8

X
- 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

X
- 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

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

X
- 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