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DERIVATIVE FINANCIAL INSTRUMENTS AND BALANCE SHEET OFFSETTING (Details 2) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2013 Receive-fixed, Pay-variable Interest Rate Swaps item | Jun. 30, 2013 Receive-fixed, Pay-variable Interest Rate Swaps item | Jun. 30, 2013 Equity swap agreements | Dec. 31, 2007 Equity swap agreements item | Jun. 30, 2013 Foreign exchange options | Dec. 31, 2012 Foreign exchange options
Derivative |  |  |  |  |  |
Number of instruments entered into during the period | 3 | 3 |  | 2 |  |
Number of hedged certificates of deposit | 3 | 3 |  |  |  |
Notional amount of each individual derivative entered into during the period | $ 30,000,000 | $ 30,000,000 |  |  |  |
Amount of each individual certificate of deposit hedged by a derivative | 30,000,000 | 30,000,000 |  |  |  |
Term of contract |  |  | 5 years |  | 5 years |
Net reduction recognized in expense related to hedge ineffectiveness | 215,000 | 303,000 |  |  |  |
Net reduction to interest expense related to net settlements of derivatives | 513,000 | 899,000 |  |  |  |
Collateral delivered by the entity in the form of securities to counterparty institutions |  |  |  |  |  | $ 940,000

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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
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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_
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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
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The aggregate fair value of assets that are pledged, at the end of the reporting period, as collateral for derivative instruments. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The term of the contract (in years) associated with the derivative instrument. + References No definition available. + Details
Name: | ewbc_TermOfContract
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Balance Type: | na
Period Type: | duration

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- Definition Aggregate notional 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 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
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- Details
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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=7476318&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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Balance Type: | credit
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- 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 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: 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=7476318&loc=SL5580258-113959 + Details
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