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BUSINESS COMBINATION (Details) (USD $) | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Jan. 17, 2014 item | Jan. 17, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business combination |  |  |  |  |  |
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 |  |  |  |  |
Goodwill recorded as a result of the business combination | 469,433,000 us-gaap_Goodwill |  |  | 469,433,000 us-gaap_Goodwill | 337,438,000 us-gaap_Goodwill | 337,438,000 us-gaap_Goodwill
MetroCorp |  |  |  |  |  |
Business combination |  |  |  |  |  |
Number of branches |  | 19 ewbc_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |  |
Number of subsidiaries |  | 2 ewbc_NumberOfSubsidiaries / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |  |
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 |  |  |
Amount given for warrant's assumed as part of consideration transferred |  |  | 8,800,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Goodwill recorded as a result of the business combination | 132,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 121,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 121,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 132,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |
Fair value of assets acquired |  | 1,700,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 1,700,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Cash and due from banks |  | 230,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 230,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Investment securities available for sale |  | 64,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 64,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
FHLB stock |  | 2,700,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankStock / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 2,700,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankStock / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Loans receivable |  | 1,190,000,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivable / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 1,190,000,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivable / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Fixed assets |  | 8,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 8,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Premiums on deposits acquired |  | 8,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 8,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
OREO |  | 9,400,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherRealEstateOwned / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 9,400,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherRealEstateOwned / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Bank owned life insurance |  | 30,000,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 30,000,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Deferred tax assets |  | 13,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 13,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Other assets |  | 16,700,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 16,700,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Fair value of liabilities acquired |  | 1,410,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 1,410,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Deposits |  | 1,320,000,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 1,320,000,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
FHLB advances |  | 10,000,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankAdvances / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 10,000,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankAdvances / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Repurchase agreements |  | 25,900,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRepurchaseAgreements / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 25,900,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRepurchaseAgreements / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Junior subordinated debts |  | 29,100,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedJuniorSubordinatedDebts / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 29,100,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedJuniorSubordinatedDebts / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Other liabilities |  | 22,700,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLiabilities / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember | 22,700,000 ewbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLiabilities / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |
Information relating to the acquisition of MetroCorp | 11,000,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  | 11,000,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |
Pro forma information |  |  |  |  |  |
Net interest income and noninterest loss | 1,028,796,000 ewbc_BusinessAcquisitionProFormaNetInterestIncomeAndNonInterestLoss / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |  | 934,207,000 ewbc_BusinessAcquisitionProFormaNetInterestIncomeAndNonInterestLoss / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
Net income after tax | 338,730,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |  | 299,625,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |
MetroCorp | Bank Owned Life Insurance |  |  |  |  |  |
Business combination |  |  |  |  |  |
Information relating to the acquisition of MetroCorp | 700,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember / us-gaap_StatementScenarioAxis = ewbc_BankOwnedLifeInsuranceMember |  |  | 700,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember / us-gaap_StatementScenarioAxis = ewbc_BankOwnedLifeInsuranceMember |  |
MetroCorp | Additional Tax Adjustments |  |  |  |  |  |
Business combination |  |  |  |  |  |
Information relating to the acquisition of MetroCorp | $ 10,300,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember / us-gaap_StatementScenarioAxis = ewbc_AdditionalTaxAdjustmentsMember |  |  | $ 10,300,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember / us-gaap_StatementScenarioAxis = ewbc_AdditionalTaxAdjustmentsMember |  |

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