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Capital Requirements (Schedule of Capital Requirements) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
The Company [Member]
Capital [Abstract]
Total Capital to Risk Weighted Assets, Actual, Amount	$ 83,923us-gaap_Capital / dei_LegalEntityAxis = efsi_CompanyMember	$ 78,426us-gaap_Capital / dei_LegalEntityAxis = efsi_CompanyMember
Total Capital to Risk Weighted Assets, Minimum Capital Requirement, Amount	35,222us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_CompanyMember	34,062us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_CompanyMember
Tier One Risk Based Capital [Abstract]
Tier 1 Capital Risk Weighted Assets, Actual, Amount	78,817us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = efsi_CompanyMember	73,101us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = efsi_CompanyMember
Tier 1 Capital Risk Weighted Assets, Minimum Capital Requirement, Amount	17,611us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_CompanyMember	17,031us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_CompanyMember
Tier One Leverage Capital [Abstract]
Tier 1 Capital to Average Assets, Actual, Amount	78,817us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = efsi_CompanyMember	73,101us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = efsi_CompanyMember
Tier 1 Capital to Average Assets, Minimum Capital Requirement, Amount	24,515us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_CompanyMember	23,435us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_CompanyMember
Risk Based Ratios [Abstract]
Total Capital to Risk Weighted Assets, Actual, Ratio	19.06%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = efsi_CompanyMember	18.42%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = efsi_CompanyMember
Total Capital to Risk Weighted Assets, Minimum Capital Requirement, Ratio	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = efsi_CompanyMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = efsi_CompanyMember
Tier 1 Capital Risk Weighted Assets, Actual, Ratio	17.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = efsi_CompanyMember	17.17%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = efsi_CompanyMember
Tier 1 Capital Risk Weighted Assets, Minimum Capital Requirement, Ratio	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = efsi_CompanyMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = efsi_CompanyMember
Tier 1 Capital to Average Assets, Actual, Ratio	12.86%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = efsi_CompanyMember	12.48%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = efsi_CompanyMember
Tier 1 Capital to Average Assets, Minimum Capital Requirement, Ratio	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = efsi_CompanyMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = efsi_CompanyMember
The Bank [Member]
Capital [Abstract]
Total Capital to Risk Weighted Assets, Actual, Amount	80,035us-gaap_Capital / dei_LegalEntityAxis = efsi_BankMember	74,595us-gaap_Capital / dei_LegalEntityAxis = efsi_BankMember
Total Capital to Risk Weighted Assets, Minimum Capital Requirement, Amount	35,107us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_BankMember	33,879us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_BankMember
Total Capital to Risk Weighted Assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	43,883us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = efsi_BankMember	42,349us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = efsi_BankMember
Tier One Risk Based Capital [Abstract]
Tier 1 Capital Risk Weighted Assets, Actual, Amount	74,929us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = efsi_BankMember	69,299us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = efsi_BankMember
Tier 1 Capital Risk Weighted Assets, Minimum Capital Requirement, Amount	17,553us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_BankMember	16,940us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_BankMember
Tier 1 Capital Risk Weighted Assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	26,330us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = efsi_BankMember	25,409us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = efsi_BankMember
Tier One Leverage Capital [Abstract]
Tier 1 Capital to Average Assets, Actual, Amount	74,929us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = efsi_BankMember	69,299us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = efsi_BankMember
Tier 1 Capital to Average Assets, Minimum Capital Requirement, Amount	24,416us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_BankMember	23,313us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = efsi_BankMember
Tier 1 Capital to Average Assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 30,520us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = efsi_BankMember	$ 29,141us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = efsi_BankMember
Risk Based Ratios [Abstract]
Total Capital to Risk Weighted Assets, Actual, Ratio	18.24%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember	17.61%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember
Total Capital to Risk Weighted Assets, Minimum Capital Requirement, Ratio	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember
Total Capital to Risk Weighted Assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember
Tier 1 Capital Risk Weighted Assets, Actual, Ratio	17.07%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember	16.36%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember
Tier 1 Capital Risk Weighted Assets, Minimum Capital Requirement, Ratio	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember
Tier 1 Capital Risk Weighted Assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = efsi_BankMember
Tier 1 Capital to Average Assets, Actual, Ratio	12.28%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = efsi_BankMember	11.89%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = efsi_BankMember
Tier 1 Capital to Average Assets, Minimum Capital Requirement, Ratio	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = efsi_BankMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = efsi_BankMember
Tier 1 Capital to Average Assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = efsi_BankMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = efsi_BankMember

X

- Definition

The amount of total capital as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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