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FAIR VALUE, Valuation Methodologies (Details) (USD $) | 9 Months Ended
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Sep. 30, 2011
Valuation Methodologies [Abstract] |
Minimum number of quoted market prices used in determining fair value of available-for-sale investment securities | 2
Number of trust preferred securities included in Level 3 available-for-sale securities | 4
Percentage of total available-for-sale securities represented by Level 3 available-for-sale securities (in hundredths) | 1.00%
Minimum number of quoted market prices traditionally used in determining fair value of level 3 available-for-sale securities | 2
Non-covered OREO | $ 21,200,000
Covered OREO | 87,300,000
Foreign Exchange Options [Member] |
Valuation Methodologies [Abstract] |
Valuation adjustment due to counterparty credit risk | 300,000
Term of contract (in years) | 5Y
Interest Rate Swaps [Member] |
Valuation Methodologies [Abstract] |
Valuation adjustment due to counterparty credit risk | $ 1,100,000
Equity Swap Agreements [Member] |
Valuation Methodologies [Abstract] |
Term of contract (in years) | 5Y

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the total of all covered other real estate owned resulting from acquisitions for which the company entered into shared-loss agreements. + Details
Name: | ewbc_CoveredOtherRealEstateOwnedFairValueDisclosure
Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The minimum number of quoted market prices obtained from independent external brokers or prices obtained from independent external pricing service providers that are used in determining the fair value of available-for-sale securities. Fair values are generally determined by reference to the average of at least two independent broker prices obtained. + Details
Name: | ewbc_MinimumNumberOfQuotedMarketPricesUsedInDeterminingFairValueOfAvailableForSaleInvestmentSecurities
Namespace Prefix: | ewbc
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the total of all non-covered other real estate owned. + Details
Name: | ewbc_NoncoveredOtherRealEstateOwnedFairValueDisclosure
Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The minimum number of quoted market prices obtained from independent external brokers that have traditionally been used in determining the fair values of level 3 available-for-sale securities. + Details
Name: | ewbc_NumberOfQuotedMarketPricesTraditionallyUsedInDeterminingFairValueOfPrivateLabelMortgageBackedSecuritiesAndPooledTrustPreferredSecurities
Namespace Prefix: | ewbc
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of trust preferred securities included in the Company's Level 3 available-for-sale securities. + Details
Name: | ewbc_NumberOfTrustPreferredSecuritiesIncludedInLevel3AvailableForSaleSecurities
Namespace Prefix: | ewbc
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of total available-for-sale securities represented by the Company's Level 3 available-for-sale securities. + Details
Name: | ewbc_PercentageOfTotalAvailableForSaleSecuritiesRepresentedByLevel3AvailableForSaleSecurities
Namespace Prefix: | ewbc
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The term of the contract (in years) associated with the derivative instrument. + Details
Name: | ewbc_TermOfContract
Namespace Prefix: | ewbc
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | instant

X
- Definition The adjustment made in the income statement for the counterparty's change in credit risk during the period. + Details
Name: | ewbc_ValuationAdjustmentDueToCounterpartyCreditRisk
Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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