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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
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Dec. 31, 2014 contract | Dec. 31, 2013 contract
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |
Number of Contracts | 5 efsi_TroubledDebtRestructuringModificationsNumberOfContracts | 5 efsi_TroubledDebtRestructuringModificationsNumberOfContracts
Pre-Modification Outstanding Recorded Investment | $ 2,746 efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment | $ 2,130 efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment
Post-Modification Outstanding Recorded Investment | 1,974 efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment | 2,130 efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment
Commercial - Non Real Estate Commercial And Industrial [Member] |  |
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |
Number of Contracts | 2 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_CommercialNonRealEstateCommercialAndIndustrialFinancingReceivableMember |
Pre-Modification Outstanding Recorded Investment | 941 efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_CommercialNonRealEstateCommercialAndIndustrialFinancingReceivableMember |
Post-Modification Outstanding Recorded Investment | 639 efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_CommercialNonRealEstateCommercialAndIndustrialFinancingReceivableMember |
Construction And Farmland Commercial [Member] |  |
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |
Number of Contracts | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember | 2 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember
Pre-Modification Outstanding Recorded Investment | 1,520 efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember | 1,608 efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember
Post-Modification Outstanding Recorded Investment | 1,050 efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember | 1,608 efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember
Residential Equity Lines [Member] |  |
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |
Number of Contracts | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember
Pre-Modification Outstanding Recorded Investment | 69 efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember | 184 efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember
Post-Modification Outstanding Recorded Investment | 69 efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember | 184 efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember
Residential Single Family Financing Receivable [Member] |  |
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |
Number of Contracts | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember | 2 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember
Pre-Modification Outstanding Recorded Investment | 216 efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember | 338 efsi_TroubledDebtRestructuringModificationsPreModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember
Post-Modification Outstanding Recorded Investment | $ 216 efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember | $ 338 efsi_TroubledDebtRestructuringModificationsPostModificationRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember

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