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Nature of Banking Activities and Significant Accounting Policies (Narrative) (Details)
12 Months Ended
Dec. 31, 2014
Jun. 19, 2013
Dec. 31, 2003
Property, Plant and Equipment [Line Items]      
Ownership percentage in subsidiaries 100.00%efsi_ConsolidatedFinancialOwnershipWhollyOwnedSubsidiaryPercentage    
Period interest on mortgage and commercial loans is discontinued 90 days    
Credit card loans and other personal loans are charged off 180 days    
Limit of the estimated appraised value of the furnished home 80.00%efsi_PercentageLimitOfEstimatedAppraisedValueOfHome    
Authorized issuance of shares of common stock     300,000efsi_CommonStockSharesAuthorizedCompensationPlan
"More likely than not" threshold 50.00%efsi_PercentageToRepresentMoreLikelyThanNot    
Number of shares of common stock able to be repurchased   150,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased  
Maximum numbers of shares that may yet be purchased under plan 134,337us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased    
Building [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 39 years    
Building [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 10 years    
Furniture and equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 10 years    
Furniture and equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 3 years