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Troubled Debt Restructurings (Loans By Class of Financing Receivable Modified as TDRs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 contract	Dec. 31, 2013 contract
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts	5efsi_TroubledDebtRestructuringModificationsNumberOfContracts	5efsi_TroubledDebtRestructuringModificationsNumberOfContracts
Troubled Debt Restructurings Within Previous Twelve Months [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts	1efsi_TroubledDebtRestructuringModificationsNumberOfContracts / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember	2efsi_TroubledDebtRestructuringModificationsNumberOfContracts / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Recorded Investment	79efsi_TroubledDebtRestructuringModificationsRecordedInvestment / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember	1,614efsi_TroubledDebtRestructuringModificationsRecordedInvestment / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Construction And Farmland Commercial [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts	1efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember	2efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember
Construction And Farmland Commercial [Member] | Troubled Debt Restructurings Within Previous Twelve Months [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts	1efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember	2efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Recorded Investment	79efsi_TroubledDebtRestructuringModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember	1,614efsi_TroubledDebtRestructuringModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Residential Single Family Financing Receivable [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts	1efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember	2efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember

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