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Fair Value Measurements (Level 3 Financial Assets Measured at Estimated Fair Value on a Nonrecurring Basis) (Details) (Nonrecurring [Member], Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Impaired Loans [Member] |
Fair Value, Assets Measured on Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
Balance - beginning of period | $ 1,407 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Sales proceeds | 0 efsi_SalesProceedsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Valuation allowance | 0 efsi_ValuationAllowanceFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
(Loss) on disposition | 0 efsi_GainLossOnDispositionOfAssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Transfers into Level 3 | 1,740 efsi_TransfersIntoLevelThreeFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Transfers out of Level 3 | (2,890)efsi_TransfersOutOfLevelThreeFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Balance - end of period | 257 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Other Real Estate Owned [Member] |
Fair Value, Assets Measured on Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
Balance - beginning of period | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Sales proceeds | 0 efsi_SalesProceedsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Valuation allowance | 0 efsi_ValuationAllowanceFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
(Loss) on disposition | 0 efsi_GainLossOnDispositionOfAssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Transfers into Level 3 | 488 efsi_TransfersIntoLevelThreeFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Transfers out of Level 3 | (488)efsi_TransfersOutOfLevelThreeFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Balance - end of period | $ 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember

X
- Details
Name: | efsi_FairValueAssetsMeasuredonNonrecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix: | efsi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gain Loss On Disposition Of Assets Fair Value Disclosure Nonrecurring + References No definition available. + Details
Name: | efsi_GainLossOnDispositionOfAssetsFairValueDisclosureNonrecurring
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sales Proceeds Fair Value Disclosure Nonrecurring + References No definition available. + Details
Name: | efsi_SalesProceedsFairValueDisclosureNonrecurring
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Transfers Into Level Three Fair Value Disclosure Nonrecurring + References No definition available. + Details
Name: | efsi_TransfersIntoLevelThreeFairValueDisclosureNonrecurring
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Transfers Out Of Level Three Fair Value Disclosure Nonrecurring + References No definition available. + Details
Name: | efsi_TransfersOutOfLevelThreeFairValueDisclosureNonrecurring
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Valuation Allowance Fair Value Disclosure Nonrecurring + References No definition available. + Details
Name: | efsi_ValuationAllowanceFairValueDisclosureNonrecurring
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant