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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2011 | Dec. 31, 2010
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Undisbursed Loan Commitments [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amount of liability | $ 2,190.0 | $ 1,890.0
Commercial and Standby Letters of Credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amount of liability | 1,700.0 | 768.8
Loans Sold or Securitized with Recourse [Member] |  |
Loss Contingencies [Line Items] |  |
Principal amount of loans sold or securitized | 620.2 | 699.6
Recourse reserve related to loan sales and securitizations totaled | 4.3 | 4.7
Loans Sold or Securitized with Recourse [Member] | Single-family Loans with Full Recourse [Member] |  |
Loss Contingencies [Line Items] |  |
Principal amount of loans sold or securitized | 55.9 | 60.9
Loans Sold or Securitized with Recourse [Member] | Multi-family Loans with Limited Recourse [Member] |  |
Loss Contingencies [Line Items] |  |
Principal amount of loans sold or securitized | 564.3 | 638.7
Recourse provision limitation, maximum percentage of the top loss on the underlying loans (in hundredths) | 4.00% | 4.00%
Loans Sold without Recourse [Member] |  |
Loss Contingencies [Line Items] |  |
Principal amount of loans sold or securitized | 1,280.0 | 1,480.0
Loans Securitized without Recourse [Member] |  |
Loss Contingencies [Line Items] |  |
Principal amount of loans sold or securitized | $ 291.6 | $ 325.5

X
- Definition The maximum percentage of the top loss on the underlying loans to which the recourse provision on multifamily loans is limited. + Details
Name: | ewbc_PercentageLimitOfRecourseOnLoans
Namespace Prefix: | ewbc
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This is the principal amount outstanding for sold or securitized loans only (across all types of loans). + 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. + Details
Name: | ewbc_RecourseReserveRelatedToLoanSalesAndSecuritizations
Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
Name: | us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration