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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 9) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 contract | Mar. 31, 2012 contract
Residential |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Period beyond which a TDR generally becomes delinquent | 90 days |  |
Residential | Residential Single-family |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Number of contracts modified as TDRs that subsequently defaulted | 2 |  |
Balance of loans modified as TDRs that subsequently defaulted | $ 2,830 | [1] |
Residential | Residential Multifamily |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Number of contracts modified as TDRs that subsequently defaulted |  |  | 2
Balance of loans modified as TDRs that subsequently defaulted |  |  | 1,109
Commercial Real Estate ("CRE") |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Period beyond which a TDR generally becomes delinquent | 30 days |  |
Commercial Real Estate ("CRE") | Construction |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Number of contracts modified as TDRs that subsequently defaulted |  |  | 1
Balance of loans modified as TDRs that subsequently defaulted |  |  | 1,509
Commercial and Industrial ("C&I") |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Period beyond which a TDR generally becomes delinquent | 30 days |  |
Commercial and Industrial ("C&I") | Commercial Business |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Number of contracts modified as TDRs that subsequently defaulted | 4 |  | 2
Balance of loans modified as TDRs that subsequently defaulted | $ 817 |  | $ 227
Consumer |  |  |
Disclosures on loans modified as TDRs that subsequently defaulted |  |  |
Period beyond which a TDR generally becomes delinquent | 30 days |  |
[1] | The financial impact includes charge-offs and specific reserves recorded at modification date.

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings and then subsequently defaulted. + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Duration of delinquency related to troubled debt restructuring loans where it becomes a nonaccrual loan and is considered to have defaulted. + References No definition available. + Details
Name: | ewbc_NumberOfDaysTroubledDebtRestructuringsBecomeDelinquent
Namespace Prefix: | ewbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of financing receivables that have been modified by troubled debt restructurings and then subsequently defaulted. + References No definition available. + Details
Name: | ewbc_NumberOfTroubledDebtRestructuringContractsThatSubsequentlyDefaulted
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration