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Securities (Restricted Investments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Carrying Value Qualitative Disclosures Related To Election [Line Items]
Restricted Investments	$ 1,946us-gaap_RestrictedInvestments	$ 2,808us-gaap_RestrictedInvestments
Federal Reserve Bank Stock [Member]
Carrying Value Qualitative Disclosures Related To Election [Line Items]
Restricted Investments	344us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = efsi_FederalReserveBankStockMember	344us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = efsi_FederalReserveBankStockMember
Federal Home Loan Bank Stock [Member]
Carrying Value Qualitative Disclosures Related To Election [Line Items]
Restricted Investments	1,462us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = us-gaap_InvestmentInFederalHomeLoanBankStockMember	2,324us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = us-gaap_InvestmentInFederalHomeLoanBankStockMember
Community Bankers' Bank Stock [Member]
Carrying Value Qualitative Disclosures Related To Election [Line Items]
Restricted Investments	$ 140us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = efsi_CommunityBankersBankStockMember	$ 140us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = efsi_CommunityBankersBankStockMember

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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