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Trust Preferred Capital Notes (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 20, 2007
Trust Preferred Capital Notes [Line Items]      
Trust preferred capital notes $ 7,217,000efsi_PreferredCapitalNotesOfTrust $ 7,217,000efsi_PreferredCapitalNotesOfTrust  
Redemption date of securities September 1, 2037    
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 equity issued by subsidiary trust     217,000efsi_CommonStockIssuedBySubsidiaryTrust
/ dei_LegalEntityAxis
= efsi_TrustIiMember
Trust preferred capital notes     $ 7,200,000efsi_PreferredCapitalNotesOfTrust
/ dei_LegalEntityAxis
= efsi_TrustIiMember
Floating rate of interest 1.88%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ dei_LegalEntityAxis
= efsi_TrustIiMember		    
Maximum [Member]      
Trust Preferred Capital Notes [Line Items]      
Portion of trust preferred securities in Tier 1 capital, percentage 25.00%efsi_PortionOfTrustPreferredSecuritiesInTierOneCapitalPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember