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Troubled Debt Restructurings (Schedule of Troubled Debt Restructurings on Financing Receivables) (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
Pre-Modification Outstanding Recorded Investment	$ 2,746efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment	$ 2,130efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment
Post-Modification Outstanding Recorded Investment	1,974efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment	2,130efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment
Commercial - Non Real Estate Commercial And Industrial [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts	2efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_CommercialNonRealEstateCommercialAndIndustrialFinancingReceivableMember
Pre-Modification Outstanding Recorded Investment	941efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_CommercialNonRealEstateCommercialAndIndustrialFinancingReceivableMember
Post-Modification Outstanding Recorded Investment	639efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_CommercialNonRealEstateCommercialAndIndustrialFinancingReceivableMember
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
Pre-Modification Outstanding Recorded Investment	1,520efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember	1,608efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember
Post-Modification Outstanding Recorded Investment	1,050efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember	1,608efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember
Residential Equity Lines [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts	1efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember	1efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember
Pre-Modification Outstanding Recorded Investment	69efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember	184efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember
Post-Modification Outstanding Recorded Investment	69efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember	184efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember
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
Pre-Modification Outstanding Recorded Investment	216efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember	338efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember
Post-Modification Outstanding Recorded Investment	$ 216efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember	$ 338efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember

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