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STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Earnings per share calculations |  |  |
Net income | $ 100,027 us-gaap_NetIncomeLoss | $ 74,171 us-gaap_NetIncomeLoss | [1]
Less: Earnings allocated to participating securities | (3)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic | (160)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic |
Basic EPS - income allocated to common stockholders | 100,024 ewbc_NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities | 74,011 ewbc_NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities | [1]
Effect of dilutive securities: |  |  |
Restricted stock units | 106 ewbc_AmountOfDilutiveSecuritiesRestrictiveStockAwards | 80 ewbc_AmountOfDilutiveSecuritiesRestrictiveStockAwards |
Diluted EPS - income allocated to common stockholders | $ 100,130 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 74,091 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | [1]
Number of Shares |  |  |
Weighted average shares outstanding | 143,655 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 141,962 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Effect of dilutive securities on weighted average shares outstanding |  |  |
Stock options (in shares) | 6 ewbc_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions | 79 ewbc_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions |
Restricted stock units (in shares) | 533 ewbc_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock | 447 ewbc_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock |
Warrants (in shares) | 155 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 144 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |
Total weighted average diluted shares outstanding | 144,349 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 142,632 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Earnings per share available to common stockholders |  |  |
Basic EPS - income allocated to common stockholders (in dollars per share) | $ 0.70 us-gaap_EarningsPerShareBasic | $ 0.52 us-gaap_EarningsPerShareBasic | [1]
Diluted EPS - income allocated to common stockholders (in dollars per share) | $ 0.69 us-gaap_EarningsPerShareDiluted | $ 0.52 us-gaap_EarningsPerShareDiluted | [1]
[1] | Prior periods were restated to reflect the retrospective application of adopting the new accounting guidance related to the Company?s investments in qualified affordable housing projects Accounting Standard Update ("ASU") 2014-01. See Note 10 of the Notes to Consolidated Financial Statements for additional information.

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