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Financial Instruments with Off-Balance-Sheet Risk (Schedule of Financial Instruments) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Commitments to extend credit $ 7,001,000efsi_FinancialInstrumentsCommitmentsToExtendCredit $ 17,574,000efsi_FinancialInstrumentsCommitmentsToExtendCredit
Unfunded commitments under lines of credit 86,588,000efsi_FinancialInstrumentsUnfundedCommitmentsUnderLinesOfCredit 81,049,000efsi_FinancialInstrumentsUnfundedCommitmentsUnderLinesOfCredit
Commercial and standby letters of credit 4,067,000efsi_FinancialInstrumentsCommercialAndStandbyLettersOfCredit 4,358,000efsi_FinancialInstrumentsCommercialAndStandbyLettersOfCredit
Excess of insurance limits held in cash accounts $ 1,200,000efsi_ExcessOfInsuranceLimitsHeldInCashAccountsInOtherCommercialBanks