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Securities (Restricted Investments) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Carrying Value Qualitative Disclosures Related To Election [Line Items] |  |
Restricted securities | $ 2,808 us-gaap_RestrictedInvestments | $ 2,192 us-gaap_RestrictedInvestments
Federal Reserve Bank Stock [Member] |  |
Carrying Value Qualitative Disclosures Related To Election [Line Items] |  |
Restricted securities | 344 us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = efsi_FederalReserveBankStockMember | 344 us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = efsi_FederalReserveBankStockMember
Federal Home Loan Bank Stock [Member] |  |
Carrying Value Qualitative Disclosures Related To Election [Line Items] |  |
Restricted securities | 2,324 us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = us-gaap_InvestmentInFederalHomeLoanBankStockMember | 1,708 us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = us-gaap_InvestmentInFederalHomeLoanBankStockMember
Community Bankers' Bank Stock [Member] |  |
Carrying Value Qualitative Disclosures Related To Election [Line Items] |  |
Restricted securities | $ 140 us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = efsi_CommunityBankersBankStockMember | $ 140 us-gaap_RestrictedInvestments / efsi_CarryingValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroupAxis = efsi_CommunityBankersBankStockMember

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- Definition 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. + References No definition available. + Details
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