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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
Net income $ 342,483us-gaap_NetIncomeLoss $ 295,045us-gaap_NetIncomeLoss $ 281,650us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:      
Net change in unrealized gains (losses) on investment securities available-for-sale 34,714us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax (35,181)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax 42,429us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax
Noncredit-related impairment loss on securities     (2,938)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities
Foreign currency translation adjustments     (900)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Net change in unrealized (losses) gains on other investments (18)ewbc_OtherInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax 53ewbc_OtherInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax 18ewbc_OtherInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax
Other comprehensive income (loss) 34,696us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (35,128)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 38,609us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
COMPREHENSIVE INCOME $ 377,179us-gaap_ComprehensiveIncomeNetOfTax $ 259,917us-gaap_ComprehensiveIncomeNetOfTax $ 320,259us-gaap_ComprehensiveIncomeNetOfTax