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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Other Commitments |  |
Other Commitments | $ 87.4 | $ 86.0
Loans Sold or Securitized with Recourse |  |
Guarantees |  |
Principal amount of loans sold or securitized | 561.2 | 589.9
Recourse reserve related to loan sales and securitizations totaled | 6.0 | 4.4
Loans Sold or Securitized with Recourse | Single-family Loans with Full Recourse |  |
Guarantees |  |
Principal amount of loans sold or securitized | 53.3 | 54.5
Loans Sold or Securitized with Recourse | Multi-family Loans with Limited Recourse |  |
Guarantees |  |
Principal amount of loans sold or securitized | 507.9 | 535.4
Recourse provision limitation, maximum percentage of the top loss on the underlying loans | 4.00% |
Loans Sold without Recourse |  |
Guarantees |  |
Principal amount of loans sold or securitized | 1,160.0 | 1,230.0
Loans Securitized without Recourse |  |
Guarantees |  |
Principal amount of loans sold or securitized | $ 266.3 | $ 273.7

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- Definition The carrying amount as of the balance sheet date of commitments to invest in affordable housing funds, and other investments qualifying for community reinvestment tax credits. + References No definition available. + Details
Name: | ewbc_OtherCommitments
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The maximum percentage of the top loss on the underlying loans to which the recourse provision on multifamily loans is limited. + References No definition available. + Details
Name: | ewbc_PercentageLimitOfRecourseOnLoans
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This is the principal amount outstanding for sold or securitized loans only (across all types of loans). + References No definition available. + Details
Name: | ewbc_PrincipalAmountOutstandingOnLoansSoldOrSecuritized
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Allowance for uncollectible accounts on receivables sold with recourse at the end of the period. + References No definition available. + Details
Name: | ewbc_RecourseReserveRelatedToLoanSalesAndSecuritizations
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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