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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements for Certain Financial Assets) (Details)	12 Months Ended
	Dec. 31, 2014
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative information about level 3 nonrecurring basis	16.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember
Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative information about level 3 nonrecurring basis	9.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember
Nonrecurring [Member] | Maximum [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative information about level 3 nonrecurring basis	60.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Nonrecurring [Member] | Maximum [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative information about level 3 nonrecurring basis	13.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Nonrecurring [Member] | Minimum [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative information about level 3 nonrecurring basis	11.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Nonrecurring [Member] | Minimum [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative information about level 3 nonrecurring basis	5.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember

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Quantitative Information Level Three Nonrecurring Basis Range

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