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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 10) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Performing loan |  |
Restructured loans disclosures |  |
Allowance for troubled debt restructurings loans receivable | $ 7,400 | $ 8,700
Nonperforming loan |  |
Restructured loans disclosures |  |
Allowance for troubled debt restructurings loans receivable | $ 366 | $ 203

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- Definition The reserve to cover probable credit losses related to financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
Name: | ewbc_AllowanceForTroubledDebtRestructuringsLoansReceivable
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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