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SUMMARY OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 4) | 12 Months Ended
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Dec. 31, 2013
Long-Term Debt |
Number of statutory business trusts | 6
Minimum |
Information on Federal funds purchased |
Federal funds maturity period | 1 day
Maximum |
Information on Federal funds purchased |
Federal funds maturity period | 6 months

X
- Definition Represents the maturity period of federal funds purchased. + References No definition available. + Details
Name: | ewbc_FederalFundsMaturityPeriod
Namespace Prefix: | ewbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of statutory business trusts of the entity. + References No definition available. + Details
Name: | ewbc_NumberOfStatutoryBusinessTrusts
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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