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FAIR VALUE (Details 4) (Discount cash flow) | 3 Months Ended
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Mar. 31, 2013
Derivative Payable | Low end of range |
Quantitative unobservable assumptions |
Credit Risk Adjustment | 1.17%
Derivative Payable | High end of range |
Quantitative unobservable assumptions |
Credit Risk Adjustment | 1.25%
Trust Preferred Securities |
Quantitative unobservable assumptions |
Constant prepayment rate for year 1-5 | 0.00%
Constant prepayment rate, thereafter | 1.00%
Constant default rate for year 1-5 | 1.20%
Constant default rate, thereafter | 0.75%
Recovery rate, existing deferral/defaults | 0.00%
Recovery rate, future deferral | 15.00%
Recovery period, future deferral | 60 months

X
- Definition Credit risk adjustment rate used as an input to measure fair value. + References No definition available. + Details
Name: | ewbc_FairValueInputsCreditRiskAdjustmentRate
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of likelihood the underlying collateral will not be repaid and instead default, used as an input to measure fair value after five years. + References No definition available. + Details
Name: | ewbc_FairValueInputsDefaultRateAfterFiveYears
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of likelihood the underlying collateral will not be repaid and instead default, used as an input to measure fair value for first five years. + References No definition available. + Details
Name: | ewbc_FairValueInputsDefaultRateForFirstFiveYears
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rate at which the underlying collateral is expected to prepay, used as an input to measure fair value after five years. + References No definition available. + Details
Name: | ewbc_FairValueInputsPrepaymentRateAfterFiveYears
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rate at which the underlying collateral is expected to prepay, used as an input to measure fair value for first five years. + References No definition available. + Details
Name: | ewbc_FairValueInputsPrepaymentRateForFirstFiveYears
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period at which the underlying collateral is expected to recover, used as an input to measure fair value. + References No definition available. + Details
Name: | ewbc_FairValueInputsRecoveryPeriodForFutureDeferral
Namespace Prefix: | ewbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rate at which the underlying collateral is expected to recover for the existing deferrals, used as an input to measure fair value. + References No definition available. + Details
Name: | ewbc_FairValueInputsRecoveryRateForExistingDeferral
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rate at which the underlying collateral is expected to recover for future deferrals, used as an input to measure fair value. + References No definition available. + Details
Name: | ewbc_FairValueInputsRecoveryRateForFutureDeferral
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration