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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |  |
Net income | $ 100,027 us-gaap_NetIncomeLoss | $ 74,171 us-gaap_NetIncomeLoss | [1]
Other comprehensive income, net of tax: |  |  |
Net change in unrealized gains on available-for-sale investment securities | 9,325 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | 13,439 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |
Net change in unrealized losses on other investments | (7)ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentNetOfTaxPortionAttributableToParent | (17)ewbc_OtherComprehensiveIncomeOtherInvestmentsAdjustmentNetOfTaxPortionAttributableToParent |
Other comprehensive income | 9,318 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 13,422 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |
COMPREHENSIVE INCOME | $ 109,345 us-gaap_ComprehensiveIncomeNetOfTax | $ 87,593 us-gaap_ComprehensiveIncomeNetOfTax | [1]
[1] | Prior periods were restated to reflect the retrospective application of adopting the new accounting guidance related to the Company?s investments in qualified affordable housing projects Accounting Standard Update ("ASU") 2014-01. See Note 10 of the Notes to Consolidated Financial Statements for additional information.

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