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COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule Of Covered Assets - disclosures |  |  |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00%ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse | 80.00%ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse | 80.00%ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse
Covered loans (net of allowance for loan losses of $3,505 in 2014 and $7,745 in 2013) | $ 1,474,189,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered | $ 2,187,898,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered |
Covered Loans |  |  |
Schedule Of Covered Assets - disclosures |  |  |
Covered loans (net of allowance for loan losses of $3,505 in 2014 and $7,745 in 2013) | 1,474,189,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember | 2,187,898,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
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 days |  |
Percentage of excess resulting from the calculation of liability to the FDIC | 50.00%ewbc_PercentageOfExcess / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Percentage of the Intrinsic Loss Estimate used in the calculation of the liability to the FDIC | 20.00%ewbc_PercentageOfIntrinsicLossEstimate / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Percentage of the asset discount used in the calculation of the liability to the FDIC | 25.00%ewbc_PercentageOfAssetDiscount / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Percentage of the Cumulative Shared-Loss Payments used in the calculation of the liability to the FDIC | 25.00%ewbc_PercentageOfCumulativeSharedLossPayments / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Estimated liability that will be due to the FDIC based on specific thresholds of losses not being reached | 110,300,000 ewbc_EstimatedLiabilityThatWillBeDueToFdicForSpecificThresholdsOfLossesNotBeingReached / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember | 74,700,000 ewbc_EstimatedLiabilityThatWillBeDueToFdicForSpecificThresholdsOfLossesNotBeingReached / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |
Covered Loans | C&I |  |  |
Schedule Of Covered Assets - disclosures |  |  |
Term of loan shared-loss agreement | 5 years |  |
Term of loss recovery provisions for loans | 8 years |  |
UCB Commercial loans and other assets, net of discount | 1,100,000,000 ewbc_CoveredLoanUcb / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Covered Loans | Single-family |  |  |
Schedule Of Covered Assets - disclosures |  |  |
Term of loan shared-loss agreement | 10 years |  |
Term of loss recovery provisions for loans | 10 years |  |
Effective period to term of loan shared-loss agreement and loss recovery provisions for loans | 10 years |  |
Covered Loans | United Commercial Bank (UCB) |  |  |
Schedule Of Covered Assets - disclosures |  |  |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00%ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse / us-gaap_BusinessAcquisitionAxis = ewbc_UnitedCommercialBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Percentage of eligible losses in excess of a specified amount for which the FDIC is obligated to reimburse the Company | 95.00%ewbc_PercentageOfEligibleLossesInExcessOfCertainAmountForWhichFdicIsObligatedToReimburse / us-gaap_BusinessAcquisitionAxis = ewbc_UnitedCommercialBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Amount of eligible losses over which the FDIC is obligated to reimburse a higher percentage | $ 2,050,000,000 ewbc_AmountOfEligibleLossesOverWhichFdicIsObligatedToReimburseHigherPercentage / us-gaap_BusinessAcquisitionAxis = ewbc_UnitedCommercialBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets | 80.00%ewbc_PercentageObligationToReimburseFdicForEligibleRecoveriesRelatedToCoveredAssets / us-gaap_BusinessAcquisitionAxis = ewbc_UnitedCommercialBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to losses in excess of a specified amount on covered assets | 95.00%ewbc_PercentageObligationToReimburseFdicForEligibleRecoveriesRelatedToLossesInExcessOfCertainAmountOnCoveredAssets / us-gaap_BusinessAcquisitionAxis = ewbc_UnitedCommercialBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Covered Loans | United Commercial Bank (UCB) | C&I |  |  |
Schedule Of Covered Assets - disclosures |  |  |
The period of time for commercial loan shared-loss agreements are in effect | 3 years |  |
Covered Loans | United Commercial Bank (UCB) | Single-family |  |  |
Schedule Of Covered Assets - disclosures |  |  |
The period of time for commercial loan shared-loss agreements are in effect | 10 years |  |
Covered Loans | Washington First International Bank (WFIB) |  |  |
Schedule Of Covered Assets - disclosures |  |  |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00%ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse / us-gaap_BusinessAcquisitionAxis = ewbc_WashingtonFirstInternationalBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Percentage of eligible losses in excess of a specified amount for which the FDIC is obligated to reimburse the Company | 95.00%ewbc_PercentageOfEligibleLossesInExcessOfCertainAmountForWhichFdicIsObligatedToReimburse / us-gaap_BusinessAcquisitionAxis = ewbc_WashingtonFirstInternationalBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets | 80.00%ewbc_PercentageObligationToReimburseFdicForEligibleRecoveriesRelatedToCoveredAssets / us-gaap_BusinessAcquisitionAxis = ewbc_WashingtonFirstInternationalBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to losses in excess of a specified amount on covered assets | 95.00%ewbc_PercentageObligationToReimburseFdicForEligibleRecoveriesRelatedToLossesInExcessOfCertainAmountOnCoveredAssets / us-gaap_BusinessAcquisitionAxis = ewbc_WashingtonFirstInternationalBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
The period of time for commercial loan shared-loss agreements are in effect | 3 years |  |
Covered Loans | Washington First International Bank (WFIB) | Minimum |  |  |
Schedule Of Covered Assets - disclosures |  |  |
Percentage of loans receivable acquired covered by shared-loss agreements | 99.00%ewbc_PercentageOfLoansOriginatedByAcquireeCoveredBySharedLossAgreements / us-gaap_BusinessAcquisitionAxis = ewbc_WashingtonFirstInternationalBankMember / us-gaap_RangeAxis = us-gaap_MinimumMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Covered Loans | Washington First International Bank (WFIB) | Single-family |  |  |
Schedule Of Covered Assets - disclosures |  |  |
The period of time for commercial loan shared-loss agreements are in effect | 10 years |  |

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
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- Definition The balance of the UCB commercial loans and other assets, net of discount + References No definition available. + Details
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- Definition Represents the effective period to the term of loan shared-loss agreement and loss recovery provisions from the acquisition date. + References No definition available. + Details
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- 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 Bank (WFIB) and United Commercial Bank (UCB). This liability is based on specific thresholds of losses no. + References No definition available. + Details
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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
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- 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
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- Definition Percentage obligation to reimburse the FDIC for eligible recoveries related to losses in excess of a certain amount on covered assets pursuant to the shared-loss agreements. + References No definition available. + Details
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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
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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
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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
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- 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
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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
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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
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X
- Definition Percentage of loans receivable acquired covered by shared-loss agreements with the FDIC. + References No definition available. + Details
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- Definition The period of time for commercial loan shared-loss agreements will extend. + References No definition available. + Details
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- Details
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- Definition Term of loan shared-loss agreement from the acquisition date. + References No definition available. + Details
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- Definition Term of loss recovery provisions from the acquisition date for loans pursuant to the shared-loss agreements. + References No definition available. + Details
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- Definition Net carrying amount of loans and leases receivable covered by loss sharing agreements. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Details
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