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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Credit Extensions |  |
Allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision | $ 19,700 | $ 12,700
Undisbursed Loan Commitments |  |
Credit Extensions |  |
Loan commitments | 3,275,323 | 3,872,223
Commercial and Standby Letters of Credit |  |
Credit Extensions |  |
Commercial and standby letters of credit ("SBLCs") | $ 1,502,351 | $ 1,253,066

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- Definition Represents the allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision of the entity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
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Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: |
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- Details
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