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BASIS OF PRESENTATION (Details) | Jun. 30, 2011
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BASIS OF PRESENTATION [Abstract] |
Number of wholly-owned subsidiaries that are statutory business trusts and are not consolidated | 9

X
- Definition The number of wholly-owned subsidiaries that are statutory business trusts and are not consolidated. + Details
Name: | ewbc_NumberOfWhollyOwnedSubsidiaries
Namespace Prefix: | ewbc
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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