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FEDERAL HOME LOAN BANK ADVANCES AND LONG-TERM DEBT (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Advances from FHLB    
Total outstanding FHLB advances $ 317,241,000us-gaap_FederalHomeLoanBankAdvancesLongTerm $ 315,092,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
Weighted average interest rates (as a percent) 0.58%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate 0.61%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
Maturities in 2015 0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate  
Maturities in 2016 0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate  
Maturities in 2017 0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate  
Maturities in 2018 0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate  
Maturities in 2019 79,400,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearFive  
Maturities in 2020 and after 237,800,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate  
Interest rate, low end of range (as a percent) 0.40%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateRangeFrom  
Interest rate, high end of range (as a percent) 0.64%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateRangeTo  
Outstanding overnight FHLB borrowings $ 0ewbc_FederalHomeLoanBankAdvancesOutstandingOvernightBorrowings $ 0ewbc_FederalHomeLoanBankAdvancesOutstandingOvernightBorrowings