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Trust Preferred Capital Notes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 20, 2007
Trust Preferred Capital Notes [Line Items]      
Common stock issued $ 8,621,000us-gaap_CommonStockValue $ 8,482,000us-gaap_CommonStockValue  
Trust preferred capital notes 7,217,000efsi_PreferredCapitalNotesOfTrust 7,217,000efsi_PreferredCapitalNotesOfTrust  
Portion of trust preferred securities in Tier 1 capital, percentage (not to exceed 25%) 25.00%efsi_PortionOfTrustPreferredSecuritiesInTierOneCapitalPercentage    
Trust II [Member]      
Trust Preferred Capital Notes [Line Items]      
Trust preferred securities issued by subsidiary trust 7,000,000efsi_TrustPreferredSecuritiesIssuedBySubsidiaryTrust
/ dei_LegalEntityAxis
= efsi_TrustIiMember		   7,000,000efsi_TrustPreferredSecuritiesIssuedBySubsidiaryTrust
/ dei_LegalEntityAxis
= efsi_TrustIiMember
Common stock issued     217,000us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= efsi_TrustIiMember
Trust preferred capital notes     $ 7,200,000efsi_PreferredCapitalNotesOfTrust
/ dei_LegalEntityAxis
= efsi_TrustIiMember
Floating rate of interest 1.86%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ dei_LegalEntityAxis
= efsi_TrustIiMember