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Troubled Debt Restructurings (Loans By Class Of Financing Receivable Modified As TDRs) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 contract | Mar. 31, 2014 contract
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |
Number of Contracts | 0 efsi_TroubledDebtRestructuringModificationsNumberOfContracts | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts
Troubled Debt Restructurings Within Previous Twelve Months [Member] |  |
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |
Number of Contracts | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember | 2 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Recorded Investment | 66 efsi_TroubledDebtRestructuringModificationsRecordedInvestment / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember | 1,613 efsi_TroubledDebtRestructuringModificationsRecordedInvestment / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Construction And Farmland Commercial [Member] | Troubled Debt Restructurings Within Previous Twelve Months [Member] |  |
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |
Number of Contracts |  | 2 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Recorded Investment |  | 1,613 efsi_TroubledDebtRestructuringModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ConstructionAndFarmlandCommercialFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember
Residential Equity Lines [Member] | Troubled Debt Restructurings Within Previous Twelve Months [Member] |  |
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |
Number of Contracts | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember |
Recorded Investment | 66 efsi_TroubledDebtRestructuringModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember / efsi_TroubledDebtRestructuringCreditorSubsequentPeriodsAxis = efsi_TroubledDebtRestructuringsWithinPreviousTwelveMonthsMember |

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- Definition Troubled debt restructuring modifications number of contracts. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Troubled debt restructuring modifications recorded investment. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |