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DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2011 instrument
Derivative |
Number of hedged certificates of deposit | 4
Amount of each individual certificate of deposit hedged by a derivative | $ 50,000,000
Receive-fixed, Pay-variable Interest Rate Swaps |
Derivative |
Number of instruments entered into during the period | 4
Notional amount of each individual derivative entered into during the period | 50,000,000
Net loss recognized in interest expense related to hedge ineffectiveness | (891,000)
Net reduction to interest expense related to net settlements of derivatives | $ 2,500,000
Equity swap agreements |
Derivative |
Number of instruments entered into during the period | 2
Term of contract | 5 years
Foreign exchange options |
Derivative |
Term of contract | 5 years

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- Definition The individual value of each of the certificates of deposit that were hedged with a derivative held by the entity. + References No definition available. + Details
Name: | ewbc_HedgedValueOfCertificatesOfDeposit
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The net (increase) decrease in interest expense related to the net settlements of the derivatives. + References No definition available. + Details
Name: | ewbc_NetReductionToInterestExpenseRelatedToNetSettlementsOfDerivatives
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The number of certificates of deposit that were hedged with a derivative held by the entity. + References No definition available. + Details
Name: | ewbc_NumberOfHedgedCertificatesOfDeposits
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
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

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- Definition Monetary amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeLineItems
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition The portion of a hedge deemed to be ineffective that is reflected in current period results of operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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