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CUSTOMER DEPOSIT ACCOUNTS (Details 3) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Time deposits: |  |
Time deposits within the Certificate of Deposit Account Registry Service (CDARS) program | $ 180.0 ewbc_TimeDepositsWithinCertificateOfDepositAccountRegistryServiceProgram | $ 203.3 ewbc_TimeDepositsWithinCertificateOfDepositAccountRegistryServiceProgram

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- Definition Represents the time deposits within the Certificate of Deposit Account Registry Service (CDARS) program that allows customers with deposits in excess of FDIC-insured limits to obtain full coverage on time deposits through a network of banks within the CDARS program. + References No definition available. + Details
Name: | ewbc_TimeDepositsWithinCertificateOfDepositAccountRegistryServiceProgram
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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