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STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jan. 17, 2014
Dec. 31, 2014
Jan. 16, 2014
Class of Stock          
Final consideration (in shares)   5,583,093us-gaap_StockIssuedDuringPeriodSharesAcquisitions      
Quarterly Dividends          
Dividends for common stock declared (in dollars per share) $ 0.20us-gaap_CommonStockDividendsPerShareDeclared $ 0.18us-gaap_CommonStockDividendsPerShareDeclared      
MetroCorp          
Class of Stock          
Final consideration (in shares)     5,583,093us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
   
Final consideration in cash     $ 89.4us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
   
Fair value of warrants assumed     8.8us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
   
Cash paid to option holders     2.4ewbc_BusinessCombinationConsiderationTransferredAmountToAcquireeStockOptionHolders
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
   
Number of warrants exercised 0ewbc_WarrantsExercised
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
       
MetroCorp          
Class of Stock          
Number of shares under warrant         771,429us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= ewbc_MetroCorpMember
Common Stock          
Class of Stock          
Amount of stock repurchase approved by the Board of Directors 100.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Quarterly Dividends          
Dividends for common stock declared (in dollars per share) $ 0.20us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
    $ 0.18us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
 
Increase from prior quarterly dividend (in dollars per share) $ 0.02ewbc_CommonStockAmountOfIncreaseInQuarterlyDividendDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Increase from prior quarterly dividend (as a percent) 11.00%ewbc_CommonStockPercentageIncreaseInQuarterlyDividendDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Common stock cash dividends paid $ 28.9us-gaap_PaymentsOfDividendsCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 25.9us-gaap_PaymentsOfDividendsCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
Common Stock | MetroCorp          
Class of Stock          
Final consideration (in shares)     5,583,093us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
   
Number of shares under warrant     230,282us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember