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Loans (Schedule of Composition of Loans) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | $ 469,820 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 444,273 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Less: Allowance for loan losses | 5,080 us-gaap_LoansAndLeasesReceivableAllowance | 5,488 us-gaap_LoansAndLeasesReceivableAllowance
Net Loans | 464,740 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 438,785 us-gaap_LoansAndLeasesReceivableNetReportedAmount
Construction and land development [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 25,887 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_ConstructionAndLandDevelopmentFinancingReceivableMember | 27,047 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_ConstructionAndLandDevelopmentFinancingReceivableMember
Secured by farmland [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 10,602 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_SecuredByFarmlandFinancingReceivablesMember | 9,886 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_SecuredByFarmlandFinancingReceivablesMember
Secured by 1-4 family residential properties [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 224,694 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_SecuredByOneToFourFamilyResidentialPropertiesFinancingReceivablesMember | 218,633 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_SecuredByOneToFourFamilyResidentialPropertiesFinancingReceivablesMember
Multifamily [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 3,016 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_MultifamilyFinancingReceivablesMember | 2,850 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_MultifamilyFinancingReceivablesMember
Commercial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 161,299 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 148,166 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Loans to farmers [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 957 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_LoansToFarmersFinancingReceivablesMember | 1,321 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_LoansToFarmersFinancingReceivablesMember
Commercial and industrial loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 28,132 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_CommercialAndIndustrialLoansFinancingReceivablesMember | 20,865 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_CommercialAndIndustrialLoansFinancingReceivablesMember
Consumer installment loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | 13,874 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_ConsumerInstallmentLoansFinancingReceivablesMember | 13,785 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_ConsumerInstallmentLoansFinancingReceivablesMember
All other loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans | $ 1,359 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_AllOtherLoansExcludingLoansToFarmersMember | $ 1,720 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_AllOtherLoansExcludingLoansToFarmersMember

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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