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Allowance for Loan Losses (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	$ 455,946efsi_CreditQualityLoansAndLeasesReceivableGrossCarryingAmount	$ 430,488efsi_CreditQualityLoansAndLeasesReceivableGrossCarryingAmount
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	3,506efsi_CreditQualityLoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember	21,622efsi_CreditQualityLoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	2,956efsi_CreditQualityLoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember	3,616efsi_CreditQualityLoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	13,620efsi_CreditQualityLoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember	14,125efsi_CreditQualityLoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Consumer [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans		1efsi_CreditQualityLoansAndLeasesReceivablesNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Financing receivables		3efsi_CreditQualityLoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Consumer [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans		1efsi_CreditQualityLoansAndLeasesReceivablesNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
Financing receivables		$ 6efsi_CreditQualityLoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember

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