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

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- Definition Credit Quality Loans And Leases Receivable Gross Carrying Amount + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Credit Quality Loans And Leases Receivables Number Of Loans + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |