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Troubled Debt Restructurings (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
contract
Mar. 31, 2014
contract
Dec. 31, 2014
contract
Financing Receivable, Modifications [Line Items]      
Number of Contracts 0efsi_TroubledDebtRestructuringModificationsNumberOfContracts 1efsi_TroubledDebtRestructuringModificationsNumberOfContracts  
Number of troubled debt restructured loans 25us-gaap_FinancingReceivableModificationsNumberOfContracts2   25us-gaap_FinancingReceivableModificationsNumberOfContracts2
Loan is considered payment default 30 days    
Financing Receivable, Modifications, Nonaccrual, Number of Contracts 4efsi_FinancingReceivableModificationsNonaccrualNumberofContracts   8efsi_FinancingReceivableModificationsNonaccrualNumberofContracts
Financing Receivable, Modifications, Nonaccrual, Recorded Investment $ 947,000efsi_FinancingReceivableModificationsNonaccrualRecordedInvestment   $ 1,400,000efsi_FinancingReceivableModificationsNonaccrualRecordedInvestment
Total troubled debt restructured loans $ 7,700,000us-gaap_FinancingReceivableModificationsRecordedInvestment   $ 7,800,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Residential Equity Lines [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructuring Modifications Interest Only Number Of Contracts   1efsi_TroubledDebtRestructuringModificationsInterestOnlyNumberOfContracts
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= efsi_ResidentialEquityLinesFinancingReceivableMember