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COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 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% |
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% |
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 | $ 35,300,000 | $ 27,700,000
Prepayment on the ASC 310-30 nonaccrual loan pools | 0 |
Commercial |  |
Schedule Of Covered Assets - disclosures |  |
Term of loan shared-loss agreement | 5 years |
Term of loss recovery provisions for loans | 8 years |
Residential Single-family |  |
Schedule Of Covered Assets - disclosures |  |
Term of loan shared-loss agreement | 10 years |
Term of loss recovery provisions for loans | 10 years |
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% |
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 | Minimum |  |
Schedule Of Covered Assets - disclosures |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets | 80.00% |
United Commercial Bank | Maximum |  |
Schedule Of Covered Assets - disclosures |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets | 95.00% |

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
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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 Bank (WFIB) and United Commercial Bank (UCB). This liability is based on specific thresholds of losses no. + References No definition available. + Details
Name: | ewbc_EstimatedLiabilityThatWillBeDueToFdicForSpecificThresholdsOfLossesNotBeingReached
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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
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Period Type: | duration

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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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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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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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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
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Namespace Prefix: | ewbc_
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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
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- 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
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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
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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
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Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of prepayment on the ASC 310-30 nonaccrual loan pools. + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- 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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