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COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 4) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
FDIC indemnification asset activity |  |  |  |
Balance at beginning of period | $ 511,135,000 |  | $ 792,133,000 |
(Amortization) Accretion | (10,071,000) |  | (18,277,000) |
Reductions | (40,968,000) | [1] | (56,596,000) | [1]
Estimate of FDIC repayment | (2,831,000) | [2] |  |
Balance at end of period | 457,265,000 |  | 717,260,000 |
FDIC Receivable |  |  |  |
FDIC loss sharing receivable | $ 85,700,000 |  | $ 76,600,000 |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00% |  |  |
Percentage of reimbursable expenses that are loan-related and OREO expenses that are recorded as non-interest expense | 100.00% |  |  |
Percentage of any reimbursable expense recorded as noninterest income | 80.00% |  |  |
Percentage of actual expense paid by the Company | 20.00% |  |  |
Percentage of Recoveries received | 80.00% |  |  |
[1] | Reductions relate to cash flows received from principal amortization, partial prepayments, loan payoffs and loan sales.
[2] | This represents the change in the calculated estimate the company will be required to pay the FDIC at the end of the FDIC loss share agreements, due to lower thresholds of losses.

X
- Definition (Amortization) accretion related to the FDIC indemnification asset. + References No definition available. + Details
Name: | ewbc_Accretion
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net present value of the amount expected to be received from the FDIC in relation to the related loss share agreement. + References No definition available. + Details
Name: | ewbc_FdicIndemnificationAsset
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The carrying amount as of the balance sheet date of the FDIC loss sharing receivable which represents the amounts reimbursable from the FDIC that have not yet been received. + References No definition available. + Details
Name: | ewbc_FdicLossSharingReceivable
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Represents the decrease in the FDIC indemnification asset due to estimated repayments. + References No definition available. + Details
Name: | ewbc_FdicRepayments
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of the actual expenses paid by the Company representing the net of the reimbursable expenses recorded in noninterest expense over the reimbursable expenses recorded in noninterest income. + References No definition available. + Details
Name: | ewbc_PercentageOfActualExpensePaid
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of any reimbursable expense (chargeoffs, loan related expenses and OREO related expenses) that is recorded as noninterest income on the Condensed Consolidated Statement of Income. + References No definition available. + Details
Name: | ewbc_PercentageOfAnyReimbursableExpenseRecordedAsNoninterestIncome
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of eligible losses for which the FDIC is obligated to reimburse the Company pursuant to the shared-loss agreements. + References No definition available. + Details
Name: | ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage share of FDIC in recoveries received. + References No definition available. + Details
Name: | ewbc_PercentageOfFdicInRecoveriesReceived
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of reimbursable expenses (loan related and OREO expenses) recorded as non-interest expense on the Condensed Consolidated Statements of Income. + References No definition available. + Details
Name: | ewbc_PercentageOfLoanRelatedAndOreoExpensesRecordedAsNonInterestExpense
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reductions in the FDIC indemnification asset. + References No definition available. + Details
Name: | ewbc_Reductions
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration