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Other Real Estate Owned - Major Classifications of Other Real Estate Owned (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Real Estate Properties [Line Items]
Other real estate, gross	$ 2,391efsi_OtherRealEstateGross	$ 2,102efsi_OtherRealEstateGross
Less valuation allowance	0us-gaap_RealEstateOwnedValuationAllowance	0us-gaap_RealEstateOwnedValuationAllowance
Total	2,391us-gaap_OtherRealEstate	2,102us-gaap_OtherRealEstate	1,809us-gaap_OtherRealEstate	1,646us-gaap_OtherRealEstate
Construction and Farmland
Real Estate Properties [Line Items]
Other real estate, gross	1,531efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_ConstructionAndFarmlandFinancingReceivableMember	1,531efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_ConstructionAndFarmlandFinancingReceivableMember
Residential Real Estate
Real Estate Properties [Line Items]
Other real estate, gross	455efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	166efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Mortgage loans in process of foreclosure	185efsi_MortgageLoansonRealEstateInProcessOfForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	0efsi_MortgageLoansonRealEstateInProcessOfForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Commercial Real Estate
Real Estate Properties [Line Items]
Other real estate, gross	$ 405efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	$ 405efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember

X

- Definition

Mortgage Loans on Real Estate, In Process Of Foreclosure

+ References

No definition available.

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X

- Definition

Other Real Estate, Gross

+ References

No definition available.

+ Details

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Namespace Prefix:	efsi_
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X

- Definition

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ 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 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period.

+ 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 210.9-03.10(4))

-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 10

-Subparagraph 4

-Article 9

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