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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 | $ 2,391 efsi_OtherRealEstateGross | $ 2,102 efsi_OtherRealEstateGross |  |
Less valuation allowance | 0 us-gaap_RealEstateOwnedValuationAllowance | 0 us-gaap_RealEstateOwnedValuationAllowance |  |
Total | 2,391 us-gaap_OtherRealEstate | 2,102 us-gaap_OtherRealEstate | 1,809 us-gaap_OtherRealEstate | 1,646 us-gaap_OtherRealEstate
Construction and Farmland |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Other real estate, gross | 1,531 efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_ConstructionAndFarmlandFinancingReceivableMember | 1,531 efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = efsi_ConstructionAndFarmlandFinancingReceivableMember |  |
Residential Real Estate |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Other real estate, gross | 455 efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 166 efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |  |
Mortgage loans in process of foreclosure | 185 efsi_MortgageLoansonRealEstateInProcessOfForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 0 efsi_MortgageLoansonRealEstateInProcessOfForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |  |
Commercial Real Estate |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Other real estate, gross | $ 405 efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | $ 405 efsi_OtherRealEstateGross / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  |

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- Definition Mortgage Loans on Real Estate, In Process Of Foreclosure + References No definition available. + Details
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- Definition Other Real Estate, Gross + References No definition available. + Details
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- 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 + Details
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- 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 + Details
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