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Troubled Debt Restructurings (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 contract | Dec. 31, 2013 contract
Financing Receivable, Modifications [Line Items] |  |
Number of troubled debt restructured loans | 25 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 20 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Total troubled debt restructured loans | $ 7.8 us-gaap_FinancingReceivableModificationsRecordedInvestment | $ 6.4 us-gaap_FinancingReceivableModificationsRecordedInvestment
Number of contracts in nonaccrual status | 8 efsi_FinancingReceivableModificationsNonaccrualNumberofContracts | 5 efsi_FinancingReceivableModificationsNonaccrualNumberofContracts
Total of loans in nonaccrual status | $ 1.4 efsi_FinancingReceivableModificationsNonaccrualRecordedInvestment | $ 1.7 efsi_FinancingReceivableModificationsNonaccrualRecordedInvestment
Number of contracts | 5 efsi_TroubledDebtRestructuringModificationsNumberOfContracts | 5 efsi_TroubledDebtRestructuringModificationsNumberOfContracts
Loan is considered payment default | 30 days |
Commercial - Non Real Estate Commercial And Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 2 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_CommercialNonRealEstateCommercialAndIndustrialFinancingReceivableMember |
Number of contracts modified by reducing the payment amount | 2 efsi_TroubledDebtRestructuringModificationsPaymentReductionNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_CommercialNonRealEstateCommercialAndIndustrialFinancingReceivableMember |
Construction And Farmland Commercial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember | 2 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember
Number of contracts modified by extending the term loan and interest payments only |  | 1 efsi_TroubledDebtRestructuringModificationsLoanExtensionInterestOnlyPaymentsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember
Number of contracts modified by granting a lower interest rate |  | 1 efsi_TroubledDebtRestructuringModificationsInterestRateNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember
Number of contracts modified by forgiving a portion of the loan | 1 efsi_TroubledDebtRestructuringModificationsLoanForgivenessNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember |
Residential Single Family Financing Receivable [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember | 2 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember
Number of contracts modified by reducing the payment amount | 1 efsi_TroubledDebtRestructuringModificationsPaymentReductionNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember |
Number of contracts modified by changing the amortization period and lowering the interest rate |  | 1 efsi_TroubledDebtRestructuringModificationsAmortizationandInterestRateNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember
Number of contracts modified by forgiving a portion of the loan |  | 1 efsi_TroubledDebtRestructuringModificationsLoanForgivenessNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialSingleFamilyFinancingReceivableMember
Residential Equity Lines [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember
Number of contracts modified by changing payments to interest only | 1 efsi_TroubledDebtRestructuringModificationsInterestOnlyNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember | 1 efsi_TroubledDebtRestructuringModificationsInterestOnlyNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember

X
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- Definition Troubled Debt Restructuring Modifications Interest Only Number Of Contracts + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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