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

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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))

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-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

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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

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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-Publisher FASB

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-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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+ References

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-Publisher FASB

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-Topic 310

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-Paragraph 2

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-Subparagraph (SX 210.9-03.7)

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