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Troubled Debt Restructurings (Loans By Class Of Financing Receivable Modified As TDRs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 contract	Mar. 31, 2014 contract
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts	0efsi_TroubledDebtRestructuringModificationsNumberOfContracts	1efsi_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	66efsi_TroubledDebtRestructuringModificationsRecordedInvestment / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember	1,613efsi_TroubledDebtRestructuringModificationsRecordedInvestment / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Construction And Farmland Commercial [Member] | Troubled Debt Restructurings Within Previous Twelve Months [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts		2efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Recorded Investment		1,613efsi_TroubledDebtRestructuringModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Residential Equity Lines [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_ResidentialEquityLinesFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Recorded Investment	66efsi_TroubledDebtRestructuringModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember

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