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STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 3)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Excluded from the computation of diluted EPS (in shares) 20us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
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177us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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340us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
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Restricted stock units      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Excluded from the computation of diluted EPS (in shares) 7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= ewbc_RestrictedStockAwardsMember
10us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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