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INCOME TAXES (Details 3) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
INCOME TAXES |  |  |
Net operating loss carryforwards | $ 4,000,000 us-gaap_OperatingLossCarryforwards |  |
Activity related to unrecognized tax benefits |  |  |
Ending Balance | 4,677,000 us-gaap_UnrecognizedTaxBenefits | 3,457,000 us-gaap_UnrecognizedTaxBenefits |
Additions for tax positions of prior years | 343,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 232,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |
Additions for tax positions of current year |  | 988,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |
Beginning Balance | 5,020,000 us-gaap_UnrecognizedTaxBenefits | 4,677,000 us-gaap_UnrecognizedTaxBenefits |
Increase in unrecognized tax benefits reserve for the California enterprise zone net interest deduction | 343,000 ewbc_IncreaseInUnrecognizedTaxBenefitsReserveForEnterpriseZoneNetInterestDeduction | 1,200,000 ewbc_IncreaseInUnrecognizedTaxBenefitsReserveForEnterpriseZoneNetInterestDeduction |
Reduction in unrecognized tax benefits reserve for California enterprise zone, net interest deduction | 0 ewbc_DecreaseInUnrecognizedTaxBenefitsReserveForEnterpriseZoneNetInterestDeduction |  |
ASC 740-10 liability | 7,200,000 ewbc_AccountingForUncertaintyInIncomeTaxesAsc74010Liability | 6,300,000 ewbc_AccountingForUncertaintyInIncomeTaxesAsc74010Liability |
Total amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate | 3,300,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 3,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Accrued interest and penalties expense for unrecognized tax positions | 597,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | (744,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 1,200,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Total interest and penalties accrued | $ 2,200,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | $ 1,600,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |

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- Definition Represents the liability recognized as per ASC 740-10 under which the entities are required to identify uncertain tax positions and disclose any potential tax liability on their financial statements. + References No definition available. + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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