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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements For Certain Financial Assets) (Details)	3 Months Ended
	Mar. 31, 2015
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative information about level 3 nonrecurring basis	17.00%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
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_RangeAxis = us-gaap_MaximumMember
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_RangeAxis = us-gaap_MaximumMember
Minimum [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative information about level 3 nonrecurring basis	10.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative information about level 3 nonrecurring basis	6.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember

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- Definition

Quantitative Information Level Three Nonrecurring Basis Range

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