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INVESTMENTS IN QUALIFIED AFFORDABLE HOUSING PARTNERSHIPS, NET, TAX CREDIT AND OTHER INVESTMENTS (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Impact of new accounting guidance |  |  |  |  |
Investment in qualified affordable housing partnerships, net | $ 182,719 ewbc_InvestmentInAffordableHousingPartnerships |  |  | $ 178,962 ewbc_InvestmentInAffordableHousingPartnerships | [1]
Other assets - Deferred tax assets |  |  |  | 389,601 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Retained earnings | 1,675,234 us-gaap_RetainedEarningsAccumulatedDeficit |  |  | 1,604,141 us-gaap_RetainedEarningsAccumulatedDeficit | [1]
Noninterest expense - Amortization of tax credit and other investments | 6,299 ewbc_NoninterestExpenseAmortizationOfTaxCreditInvestments | 1,492 ewbc_NoninterestExpenseAmortizationOfTaxCreditInvestments | [1] |  |
Income before taxes | 146,826 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 116,163 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | [1] |  |
Provision for income taxes | 46,799 us-gaap_IncomeTaxExpenseBenefit | 41,992 us-gaap_IncomeTaxExpenseBenefit | [1] |  |
Net income | 100,027 us-gaap_NetIncomeLoss | 74,171 us-gaap_NetIncomeLoss | [1] |  |
EARNINGS PER SHARE |  |  |  |  |
BASIC (in dollars per share) | $ 0.70 us-gaap_EarningsPerShareBasic | $ 0.52 us-gaap_EarningsPerShareBasic | [1] |  |
DILUTED (in dollars per share) | $ 0.69 us-gaap_EarningsPerShareDiluted | $ 0.52 us-gaap_EarningsPerShareDiluted | [1] |  |
Previously Reported |  |  |  |  |
Impact of new accounting guidance |  |  |  |  |
Investment in qualified affordable housing partnerships, net |  |  |  | 178,652 ewbc_InvestmentInAffordableHousingPartnerships / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Other assets - Deferred tax assets |  |  |  | 384,367 us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Retained earnings |  |  |  | 1,598,598 us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Noninterest expense - Amortization of tax credit and other investments |  | 5,964 ewbc_NoninterestExpenseAmortizationOfTaxCreditInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |
Income before taxes |  | 111,690 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |
Provision for income taxes |  | 34,949 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |
Net income |  | $ 76,741 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |
EARNINGS PER SHARE |  |  |  |  |
BASIC (in dollars per share) |  | $ 0.54 us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |
DILUTED (in dollars per share) |  | $ 0.54 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |
[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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- Definition Investments in limited partnership interests in affordable housing projects for lower income tenants, which have related tax credits. The initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received, and the amortization is recognized in the income statement as a component of income tax expense. + References No definition available. + Details
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- Definition Amortization of investments in projects that qualify for Community Reinvestment Act ("CRA") and other tax credits, included as a component of noninterest expense. + References No definition available. + Details
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