XML 24 R50.htm IDEA: XBRL DOCUMENT
v2.4.0.6

COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details) (USD $) | Mar. 31, 2012 D Y | Dec. 31, 2011
--- | --- | ---
Schedule Of Covered Assets - disclosures |  |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00% |
Term of commercial loan shared-loss agreement (in years) | 5 |
Term of single-family residential mortgage loan shared-loss agreement (in years) | 10 |
Term of loss recovery provisions for commercial loans (in years) | 8 |
Term of loss recovery provisions for single-family residential mortgage loans (in years) | 10 |
Number of days following the 10th anniversary of the acquisition date upon which the Company will be required to pay a calculated amount to the FDIC | 45 |
Percentage of excess resulting from the calculation of liability to the FDIC | 50.00% |
Percentage of the Intrinsic Loss Estimate used in the calculation of the liability to the FDIC | 20.00% |
Percentage of the asset discount used in the calculation of the liability to the FDIC | 25.00% |
Percentage of the Cumulative Shared-Loss Payments used in the calculation of the liability to the FDIC | 25.00% |
Estimated liability that will be due to the FDIC based on specific thresholds of losses not being reached | $ 13,500,000 | $ 10,700,000
Washington First International Bank |  |
Schedule Of Covered Assets - disclosures |  |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00% |
Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets | 80.00% |
Washington First International Bank | Minimum |  |
Schedule Of Covered Assets - disclosures |  |
Percentage of loans receivable acquired covered by shared-loss agreements | 99.00% |
United Commercial Bank |  |
Schedule Of Covered Assets - disclosures |  |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00% |
Percentage of eligible losses in excess of a specified amount for which the FDIC is obligated to reimburse the Company | 95.00% |
Amount of eligible losses over which the FDIC is obligated to reimburse a higher percentage | $ 2,050,000,000 |
United Commercial Bank | Maximum |  |
Schedule Of Covered Assets - disclosures |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets | 95.00% |
United Commercial Bank | Minimum |  |
Schedule Of Covered Assets - disclosures |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets | 80.00% |

X
- Definition Amount of eligible losses for covered assets over which the FDIC is obligated to reimburse a higher percentage pursuant to the shared-loss agreements. + References No definition available. + Details
Name: | ewbc_AmountOfEligibleLossesOverWhichFdicIsObligatedToReimburseHigherPercentage
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The estimated liability that will be due to the FDIC forty-five days after the tenth anniversary of the acquisition of Washington First International Band (WFIB) and United Commercial Bank (UCB). This liability is based on specific thresholds of losses no. + References No definition available. + Details
Name: | ewbc_EstimatedLiabilityThatWillBeDueToFdicForSpecificThresholdsOfLossesNotBeingReached
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of days following the 10th anniversary of the respective acquisition date upon which the Company will be required to pay to the FDIC a calculated amount, based on the specific thresholds of losses not being reached. + References No definition available. + Details
Name: | ewbc_NumberOfDaysFollowingAnniversary
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets pursuant to the shared-loss agreements. + References No definition available. + Details
Name: | ewbc_PercentageObligationToReimburseFdicForEligibleRecoveriesRelatedToCoveredAssets
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of the asset discount, as defined in the shared-loss agreements, used in the calculation of this liability to the FDIC. + References No definition available. + Details
Name: | ewbc_PercentageOfAssetDiscount
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of the Cumulative Shared-Loss Payments, as defined in the shared-loss agreements, used in the calculation of this liability to the FDIC. + References No definition available. + Details
Name: | ewbc_PercentageOfCumulativeSharedLossPayments
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 Percentage of eligible losses for covered assets in excess of a certain amount for which the FDIC is obligated to reimburse the Company pursuant to the shared-loss agreements. + References No definition available. + Details
Name: | ewbc_PercentageOfEligibleLossesInExcessOfCertainAmountForWhichFdicIsObligatedToReimburse
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of excess resulting from the calculation of this liability to the FDIC as stated in the shared-loss agreements. + References No definition available. + Details
Name: | ewbc_PercentageOfExcess
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of the Intrinsic Loss Estimate, as defined in the shared-loss agreements, used in the calculation of this liability to the FDIC. + References No definition available. + Details
Name: | ewbc_PercentageOfIntrinsicLossEstimate
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of loans receivable acquired covered by shared-loss agreements with the FDIC. + References No definition available. + Details
Name: | ewbc_PercentageOfLoansOriginatedByAcquireeCoveredBySharedLossAgreements
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Term of commercial loan shared-loss agreement from the acquisition date. + References No definition available. + Details
Name: | ewbc_TermOfCommercialLoanSharedLossAgreement
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Term of loss recovery provisions from the acquisition date for commercial loans pursuant to the shared-loss agreements. + References No definition available. + Details
Name: | ewbc_TermOfLossRecoveryProvisionsForCommercialLoans
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Term of loss recovery provisions from the acquisition date for single-family residential mortgage loans pursuant to the share-loss agreements. + References No definition available. + Details
Name: | ewbc_TermOfLossRecoveryProvisionsForSingleFamilyResidentialMortgageLoans
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Term of single-family residential mortgage loan shared-loss agreement from the acquisition date. + References No definition available. + Details
Name: | ewbc_TermOfSingleFamilyResidentialMortgageLoanSharedLossAgreement
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant