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NON COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES, Restructured Loans (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
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Restructured Loans [Abstract] |  |
Amount of restructured loans that are performing according to new terms and conditions | $ 60.1 | $ 122.1
Amount of nonperforming restructured loans that are on nonaccrual status | $ 11.9 | $ 42.1

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- Definition The amount of the outstanding recorded investment related to financing receivables that has been restructured and is not performing according to new terms and conditions and is in nonaccrual status. + Details
Name: | ewbc_FinancingReceivableRestructuredRecordedInvestmentNonperforming
Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the outstanding recorded investment related to financing receivables that has been restructured and is performing according to new terms and conditions. + Details
Name: | ewbc_FinancingReceivableRestructuredRecordedInvestmentPerforming
Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ewbc_RestructuredLoansAbstract
Namespace Prefix: | ewbc
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration