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FAIR VALUE (Details 5) (USD $)	3 Months Ended
	Mar. 31, 2012 marketprices trust
Valuation Methodologies
Minimum number of quoted market prices used in determining fair value of available-for-sale investment securities	2
Number of trust preferred securities included in Level 3 available-for-sale securities	4
Percentage of total available-for-sale securities represented by Level 3 available-for-sale securities, maximum	1.00%
Minimum number of quoted market prices traditionally used in determining fair value of level 3 available-for-sale securities	2
Non-covered OREO	$ 46,300,000
Covered OREO	55,600,000
Equity swap agreements
Valuation Methodologies
Term of contract	5 years
Foreign exchange options
Valuation Methodologies
Term of contract	5 years
Valuation adjustment due to counterparty credit risk	200,000
Interest rate swaps
Valuation Methodologies
Valuation adjustment due to counterparty credit risk	$ 300,000

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the total of all covered other real estate owned resulting from acquisitions for which the company entered into shared-loss agreements.

+ References

No definition available.

+ Details

Name:	ewbc_CoveredOtherRealEstateOwnedFairValueDisclosure
Namespace Prefix:	ewbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The minimum number of quoted market prices obtained from independent external brokers or prices obtained from independent external pricing service providers that are used in determining the fair value of available-for-sale securities. Fair values are generally determined by reference to the average of at least two independent broker prices obtained.

+ References

No definition available.

+ Details

Name:	ewbc_MinimumNumberOfQuotedMarketPricesUsedInDeterminingFairValueOfAvailableForSaleInvestmentSecurities
Namespace Prefix:	ewbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the total of all non-covered other real estate owned.

+ References

No definition available.

+ Details

Name:	ewbc_NoncoveredOtherRealEstateOwnedFairValueDisclosure
Namespace Prefix:	ewbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The minimum number of quoted market prices obtained from independent external brokers that have traditionally been used in determining the fair values of level 3 available-for-sale securities.

+ References

No definition available.

+ Details

Name:	ewbc_NumberOfQuotedMarketPricesTraditionallyUsedInDeterminingFairValueOfPrivateLabelMortgageBackedSecuritiesAndPooledTrustPreferredSecurities
Namespace Prefix:	ewbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of trust preferred securities included in the Company's Level 3 available-for-sale securities.

+ References

No definition available.

+ Details

Name:	ewbc_NumberOfTrustPreferredSecuritiesIncludedInLevel3AvailableForSaleSecurities
Namespace Prefix:	ewbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The maximum percentage of total available-for-sale securities represented by the Company's Level 3 available-for-sale securities.

+ References

No definition available.

+ Details

Name:	ewbc_PercentageOfTotalAvailableForSaleSecuritiesRepresentedByLevel3AvailableForSaleSecurities
Namespace Prefix:	ewbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The term of the contract (in years) associated with the derivative instrument.

+ References

No definition available.

+ Details

Name:	ewbc_TermOfContract
Namespace Prefix:	ewbc_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The adjustment made in the income statement for the counterparty's change in credit risk during the period.

+ References

No definition available.

+ Details

Name:	ewbc_ValuationAdjustmentDueToCounterpartyCreditRisk
Namespace Prefix:	ewbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueByBalanceSheetGroupingMethodologyAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration