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Commitments and Contingencies (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Credit Extensions |  |
Loan commitments | $ 4,956,515 | $ 5,077,869
Commercial letters of credit and SBLCs | 1,757,648 | 1,525,613
Commercial Letters of Credit |  |
Credit Extensions |  |
Commercial letters of credit and SBLCs | 59,100 |
Standby Letters of Credit |  |
Credit Extensions |  |
Commercial letters of credit and SBLCs | 1,700,000 |
Accrued Expenses and Other Liabilities |  |
Credit Extensions |  |
Allowance for unfunded credit reserves | $ 14,000 | $ 15,700

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- Definition Reflects the Allowance for Unfunded Loan Commitments and Letters of Credit + References No definition available. + Details
Name: | ewbc_AllowanceforUnfundedLoanCommitmentsandLettersofCredit
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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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Balance Type: | credit
Period Type: | instant

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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