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STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 5) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Unrealized gains (losses) on investment securities available-for-sale:      
Net unrealized gains (losses) arising during period, before-tax amount $ 70,704us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ (48,567)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ 73,910us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less: reclassification adjustment for gains included in net income, before-tax amount (10,851)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1] (12,089)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1] (757)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1]
Net unrealized gains (losses), before-tax amount 59,853us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent (60,656)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent 73,153us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent
Noncredit-related impairment loss on securities     (5,066)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities
Foreign currency translation adjustments, before-tax amount     (1,552)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent
Unrealized gains (losses) on other investment securities:      
Net unrealized (losses) gains arising during period, before-tax amount (167)ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax 579ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax 53ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax
Less: reclassification adjustment for (gains) losses included in income, before-tax amount 136ewbc_OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeBeforeTax [2] (488)ewbc_OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeBeforeTax [2] (23)ewbc_OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeBeforeTax [2]
Net unrealized gains (losses), before-tax amount (31)ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentBeforeTaxPortionAttributableToParent 91ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentBeforeTaxPortionAttributableToParent 30ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentBeforeTaxPortionAttributableToParent
Other comprehensive income (loss), before-tax amount 59,822us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent (60,565)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent 66,565us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Unrealized gains (losses) on investment securities available-for-sale:      
Net unrealized gains (losses) arising during period, tax expense or benefit (29,696)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 20,398us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (31,042)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Less: reclassification adjustment for gains included in net income, tax expense or benefit 4,557us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax [1] 5,077us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax [1] 318us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax [1]
Net unrealized gains (losses), tax expense or benefit (25,139)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent 25,475us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent (30,724)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent
Non credit-related impairment loss on securities, tax effect     2,128us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities
Foreign currency translation adjustments, tax (expense) or benefit     652us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
Unrealized gains (losses) on other investment securities:      
Net unrealized gains (losses) arising during period, tax expense or benefit 70ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossTax (243)ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossTax (22)ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossTax
Less: reclassification adjustment for gains included in net income, tax expense or benefit (57)ewbc_OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeTax [2] 205ewbc_OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeTax [2] 10ewbc_OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeTax [2]
Net unrealized gains (losses), tax expense or benefit 13ewbc_OtherComprehensiveIncomeOtherInvestmentsTaxPortionAttributableToParent (38)ewbc_OtherComprehensiveIncomeOtherInvestmentsTaxPortionAttributableToParent (12)ewbc_OtherComprehensiveIncomeOtherInvestmentsTaxPortionAttributableToParent
Other comprehensive income (loss), tax expense or benefit (25,126)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 25,437us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 (27,956)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Unrealized gains (losses) on investment securities available-for-sale:      
Net unrealized gains (losses) arising during period, net-of-tax amount 41,008us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (28,169)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 42,868us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: reclassification adjustment for gains included in net income, net-of-tax amount (6,294)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1] (7,012)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1] (439)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1]
Net unrealized gains (losses), net-of-tax amount 34,714us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent (35,181)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent 42,429us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Non credit-related impairment loss on securities, net of tax amount     (2,938)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities
Foreign currency translation adjustments     (900)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Unrealized gains (losses) on other investment securities      
Net unrealized gains (losses) arising during period, net-of-tax amount (97)ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax 336ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax 31ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax
Less: reclassification adjustment for gains included in net income, net-of-tax amount 79ewbc_OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeNetOfTax [2] (283)ewbc_OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeNetOfTax [2] (13)ewbc_OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeNetOfTax [2]
Net unrealized gains (losses), net-of-tax amount (18)ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentNetOfTaxPortionAttributableToParent 53ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentNetOfTaxPortionAttributableToParent 18ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentNetOfTaxPortionAttributableToParent
Other comprehensive income (loss) $ 34,696us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent $ (35,128)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent $ 38,609us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
[1] The pretax amount is reported in net gains on sales of investment securities in the consolidated statements of income.
[2] The pretax income is reported in dividend and other investment income in the consolidated statements of income.