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Change in Accumulated Other Comprehensive Income (Changes To Accumulated Other Comprehensive Income By Components) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 1,315us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ 305us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income (loss) before reclassifications	694us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	1,074us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
Reclassifications from other comprehensive (loss) income	(74)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
Tax effect of current period changes	(212)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges	(364)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges
Total other comprehensive income (loss)	408us-gaap_OtherComprehensiveIncomeLossNetOfTax	710us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending balance	1,723us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	1,015us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Unrealized Gains And Losses On Available For Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,466us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	547us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Other comprehensive income (loss) before reclassifications	677us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	1,035us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Reclassifications from other comprehensive (loss) income	(74)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Tax effect of current period changes	(206)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	(351)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Total other comprehensive income (loss)	397us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	684us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Ending balance	1,863us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	1,231us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Change In Fair Value Of Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(190)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember	(286)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember
Other comprehensive income (loss) before reclassifications	17us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember	39us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember
Tax effect of current period changes	(6)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember	(13)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember
Total other comprehensive income (loss)	11us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember	26us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember
Ending balance	(179)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember	(260)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember
Change In Benefit Obligations And Plan Assets For The Post Retirement Benefit Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			39us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	44us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Ending balance	$ 39us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	$ 44us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	$ 39us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	$ 44us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

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Other Comprehensive Income (Loss), Tax Effect Of Current Period Changes

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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