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STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | 143,582,229 us-gaap_CommonStockSharesOutstanding |  |  |  | 137,630,896 us-gaap_CommonStockSharesOutstanding |  |  |  | 143,582,229 us-gaap_CommonStockSharesOutstanding | 137,630,896 us-gaap_CommonStockSharesOutstanding |
Earnings per share calculations |  |  |  |  |  |  |  |  |  |  |
Net income | $ 92,998 us-gaap_NetIncomeLoss | $ 88,756 us-gaap_NetIncomeLoss | $ 83,988 us-gaap_NetIncomeLoss | $ 76,741 us-gaap_NetIncomeLoss | $ 75,782 us-gaap_NetIncomeLoss | $ 73,157 us-gaap_NetIncomeLoss | $ 74,015 us-gaap_NetIncomeLoss | $ 72,091 us-gaap_NetIncomeLoss | $ 342,483 us-gaap_NetIncomeLoss | $ 295,045 us-gaap_NetIncomeLoss | $ 281,650 us-gaap_NetIncomeLoss
Less: Preferred stock dividends |  |  |  |  |  |  | (1,714)us-gaap_PreferredStockDividendsAndOtherAdjustments | (1,714)us-gaap_PreferredStockDividendsAndOtherAdjustments |  | (3,428)us-gaap_PreferredStockDividendsAndOtherAdjustments | (6,857)us-gaap_PreferredStockDividendsAndOtherAdjustments
Less: Earnings allocated to participating securities |  |  |  |  |  |  |  |  | (502)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic | (1,692)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic | (3,279)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Basic EPS - income allocated to common stockholders |  |  |  |  |  |  |  |  | 341,981 ewbc_NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities | 289,925 ewbc_NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities | 271,514 ewbc_NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  | 287 ewbc_AmountOfDilutiveSecuritiesRestrictiveStockAwards | 196 ewbc_AmountOfDilutiveSecuritiesRestrictiveStockAwards | 47 ewbc_AmountOfDilutiveSecuritiesRestrictiveStockAwards
Convertible preferred stock |  |  |  |  |  |  |  |  |  | 3,428 ewbc_AmountOfDilutiveSecuritiesConvertiblePreferredStock | 6,857 ewbc_AmountOfDilutiveSecuritiesConvertiblePreferredStock
Diluted EPS - income allocated to common stockholders |  |  |  |  |  |  |  |  | $ 342,268 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 293,549 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 278,418 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Number of Shares |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding |  |  |  |  |  |  |  |  | 142,952,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 137,342,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 141,457,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities on weighted average shares outstanding |  |  |  |  |  |  |  |  |  |  |
Stock options (in shares) |  |  |  |  |  |  |  |  | 67,000 ewbc_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions | 71,000 ewbc_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions | 29,000 ewbc_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions
Restricted stock units (in shares) |  |  |  |  |  |  |  |  | 398,000 ewbc_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock | 327,000 ewbc_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock | 118,000 ewbc_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock
Convertible preferred stock (in shares) |  |  |  |  |  |  |  |  |  | 1,834,000 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | 5,571,000 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Warrants (in shares) |  |  |  |  |  |  |  |  | 146,000 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |  |
Total weighted average diluted shares outstanding |  |  |  |  |  |  |  |  | 143,563,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 139,574,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 147,175,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per Share Amounts |  |  |  |  |  |  |  |  |  |  |
Basic EPS - income allocated to common stockholders (in dollars per share) | $ 0.65 us-gaap_EarningsPerShareBasic | $ 0.62 us-gaap_EarningsPerShareBasic | $ 0.59 us-gaap_EarningsPerShareBasic | $ 0.54 us-gaap_EarningsPerShareBasic | $ 0.55 us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.52 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 2.39 us-gaap_EarningsPerShareBasic | $ 2.11 us-gaap_EarningsPerShareBasic | $ 1.92 us-gaap_EarningsPerShareBasic
Diluted EPS - Income available to common stockholders (in dollars per share) | $ 0.65 us-gaap_EarningsPerShareDiluted | $ 0.62 us-gaap_EarningsPerShareDiluted | $ 0.58 us-gaap_EarningsPerShareDiluted | $ 0.54 us-gaap_EarningsPerShareDiluted | $ 0.55 us-gaap_EarningsPerShareDiluted | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.52 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ 2.38 us-gaap_EarningsPerShareDiluted | $ 2.10 us-gaap_EarningsPerShareDiluted | $ 1.89 us-gaap_EarningsPerShareDiluted

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