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SIGNIFICANT ACCOUNTING POLICIES (Details) | 6 Months Ended
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Jun. 30, 2012
Recent accounting standards |
Minimum percentage of likelihood to determine that it is more likely than not | 50.00%

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- Definition Represents the minimum percentage of likelihood to determine that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. + References No definition available. + Details
Name: | ewbc_MoreLikelyThanNotMinimumLikelihoodPercentage
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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