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BUSINESS COMBINATION (Details) (USD $) | 3 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 entity | Mar. 31, 2014 entity | Jan. 17, 2014 | Dec. 31, 2014
Business combination |  |  |  |
Number of business combinations | 0 us-gaap_NumberOfBusinessesAcquired | 1 us-gaap_NumberOfBusinessesAcquired |  |
Purchase consideration |  |  |  |
Consideration transferred in the acquisition (in shares) |  | 5,583,093 us-gaap_StockIssuedDuringPeriodSharesAcquisitions |  |
Issuance of 5,583,093 shares pursuant to MetroCorp acquisition |  | $ 190,830,000 us-gaap_StockIssuedDuringPeriodValueAcquisitions |  |
Assets acquired and liabilities assumed |  |  |  |
Goodwill recorded as a result of the business combination | 469,433,000 us-gaap_Goodwill | 458,467,000 us-gaap_Goodwill |  | 469,433,000 us-gaap_Goodwill
MetroCorp |  |  |  |
Purchase consideration |  |  |  |
Percentage of purchase consideration satisfied in stock |  |  | 66.67%ewbc_BusinessCombinationPercentageOfConsiderationTransferredInStock / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Percentage of purchase consideration satisfied in cash |  |  | 33.33%ewbc_BusinessCombinationPercentageOfConsiderationTransferredInCash / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Fair value of the consideration transferred |  |  | 291,400,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Consideration transferred in the acquisition (in shares) |  |  | 5,583,093 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Issuance of 5,583,093 shares pursuant to MetroCorp acquisition |  |  | 190,800,000 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Consideration transferred in cash |  |  | 89,400,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Additional cash given to acquiree's stock option holders as part of consideration transferred |  |  | 2,400,000 ewbc_BusinessCombinationConsiderationTransferredAmountToAcquireeStockOptionHolders / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Fair value of warrants assumed as part of consideration transferred |  |  | 8,800,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Assets acquired and liabilities assumed |  |  |  |
Fair value of assets acquired |  |  | 1,700,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Fair value of liabilities acquired |  |  | 1,410,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Goodwill recorded as a result of the business combination |  |  | 121,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 132,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember
MetroCorp | Adjustments |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Deferred tax assets |  |  |  | (10,300,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Bank owned life insurance |  |  |  | $ (700,000)ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember

X
- Definition Represents the amount given to acquiree's stock option holders by the acquirer as part of consideration transferred in a business combination. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of deferred tax asset attributable to deductible temporary differences and carryforwards that are expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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