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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) |  | 5,583,093 us-gaap_StockIssuedDuringPeriodSharesAcquisitions |  |  |
Quarterly Dividends |  |  |  |  |
Dividends for common stock declared (in dollars per share) | $ 0.20 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.18 us-gaap_CommonStockDividendsPerShareDeclared |  |  |
MetroCorp |  |  |  |  |
Class of Stock |  |  |  |  |
Final consideration (in shares) |  |  | 5,583,093 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |
Final consideration in cash |  |  | $ 89.4 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |
Fair value of warrants assumed |  |  | 8.8 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |
Cash paid to option holders |  |  | 2.4 ewbc_BusinessCombinationConsiderationTransferredAmountToAcquireeStockOptionHolders / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |
Number of warrants exercised | 0 ewbc_WarrantsExercised / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember |  |  |  |
MetroCorp |  |  |  |  |
Class of Stock |  |  |  |  |
Number of shares under warrant |  |  |  |  | 771,429 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / dei_LegalEntityAxis = ewbc_MetroCorpMember
Common Stock |  |  |  |  |
Class of Stock |  |  |  |  |
Amount of stock repurchase approved by the Board of Directors | 100.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |
Quarterly Dividends |  |  |  |  |
Dividends for common stock declared (in dollars per share) | $ 0.20 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  | $ 0.18 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Increase from prior quarterly dividend (in dollars per share) | $ 0.02 ewbc_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 | $ 28.9 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 25.9 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |
Common Stock | MetroCorp |  |  |  |  |
Class of Stock |  |  |  |  |
Final consideration (in shares) |  |  | 5,583,093 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Number of shares under warrant |  |  | 230,282 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_BusinessAcquisitionAxis = ewbc_MetroCorpMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |

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