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Securities (Restricted Investments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Carrying Value Qualitative Disclosures Related To Election [Line Items]
Restricted securities	$ 2,808us-gaap_RestrictedInvestments	$ 2,192us-gaap_RestrictedInvestments
Federal Reserve Bank Stock [Member]
Carrying Value Qualitative Disclosures Related To Election [Line Items]
Restricted securities	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 securities	2,324us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = us-gaap_InvestmentInFederalHomeLoanBankStockMember	1,708us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = us-gaap_InvestmentInFederalHomeLoanBankStockMember
Community Bankers' Bank Stock [Member]
Carrying Value Qualitative Disclosures Related To Election [Line Items]
Restricted securities	$ 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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