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STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 5) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Unrealized gains on available-for-sale investment securities: |  |  |  |
Net unrealized gains arising during period, before-tax amount | $ 20,482 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax |  | $ 26,590 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax |
Less: reclassification adjustment for gains included in net income, before-tax amount | (4,404)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | [1] | (3,418)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | [1]
Net unrealized gains, before-tax amount | 16,078 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent |  | 23,172 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent |
Unrealized losses on other investments: |  |  |  |
Net unrealized losses arising during period, before-tax amount | (12)ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax |  | (29)ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax |
Net unrealized losses, before-tax amount | (12)ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentBeforeTaxPortionAttributableToParent |  | (29)ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentBeforeTaxPortionAttributableToParent |
Other comprehensive income, before-tax amount | 16,066 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent |  | 23,143 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent |
Unrealized gains on available-for-sale investment securities: |  |  |  |
Net unrealized gains arising during period, tax expense or benefit | (8,603)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax |  | (11,168)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax |
Less: reclassification adjustment for gains included in net income, tax expense or benefit | 1,850 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax | [1] | 1,435 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax | [1]
Net unrealized gains, tax expense or benefit | (6,753)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent |  | (9,733)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent |
Unrealized losses on other investments: |  |  |  |
Net unrealized losses arising during period, tax expense or benefit | 5 ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossTax |  | 12 ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossTax |
Net unrealized losses, tax expense or benefit | 5 ewbc_OtherComprehensiveIncomeOtherInvestmentsTaxPortionAttributableToParent |  | 12 ewbc_OtherComprehensiveIncomeOtherInvestmentsTaxPortionAttributableToParent |
Other comprehensive income, tax expense or benefit | (6,748)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 |  | (9,721)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 |
Unrealized gains on available-for-sale investment securities: |  |  |  |
Net unrealized gains arising during period, net-of-tax amount | 11,879 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  | 15,422 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |
Less: reclassification adjustment for gains included in net income, net-of-tax amount | (2,554)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | [1] | (1,983)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | [1]
Net unrealized gains, net-of-tax amount | 9,325 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |  | 13,439 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |
Unrealized losses on other investments: |  |  |  |
Net unrealized losses arising during period, net-of-tax amount | (7)ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax |  | (17)ewbc_OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax |
Net unrealized losses, net-of-tax amount | (7)ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentNetOfTaxPortionAttributableToParent |  | (17)ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentNetOfTaxPortionAttributableToParent |
Other comprehensive income | $ 9,318 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  | $ 13,422 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |
[1] | The pretax amount is reported in net gains on sales of available-for-sale investment securities in the consolidated statements of income.

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