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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 | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] [Roll Forward] |  |  |
Beginning balance | $ 305 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ 3,448 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ 2,931 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income (loss) before reclassifications | 2,519 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax | (4,296)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax | 828 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
Reclassifications from other comprehensive income (loss) | (990)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax | (465)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax | (45)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
Tax effect of current period changes | (519)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges | 1,618 efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges | (266)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges
Total other comprehensive income (loss) | 1,010 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (3,143)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 517 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending balance | 1,315 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 305 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 3,448 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Unrealized Gains And Losses On Available For Sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] [Roll Forward] |  |  |
Beginning balance | 547 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 3,822 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 3,262 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Other comprehensive income (loss) before reclassifications | 2,382 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (4,497)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 894 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Reclassifications from other comprehensive income (loss) | (990)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (465)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (45)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Tax effect of current period changes | (473)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 1,687 efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (289)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Total other comprehensive income (loss) | 919 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (3,275)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 560 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Ending balance | 1,466 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 547 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 3,822 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Change In Fair Value Of Interest Rate Swap [Member] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] [Roll Forward] |  |  |
Beginning balance | (286)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember | (418)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember | (382)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember
Other comprehensive income (loss) before reclassifications | 145 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember | 201 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember | (55)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember
Tax effect of current period changes | (49)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember | (69)efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember | 19 efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember
Total other comprehensive income (loss) | 96 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember | 132 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember | (36)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember
Ending balance | (190)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember | (286)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = efsi_ChangeInFairValueOfInterestRateSwapMember | (418)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), Net of Tax [Roll Forward] [Roll Forward] |  |  |
Beginning balance | 44 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 44 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 51 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Other comprehensive income (loss) before reclassifications | (8)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 0 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (11)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Tax effect of current period changes | 3 efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 0 efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 4 efsi_OtherComprehensiveIncomeLossTaxEffectOfCurrentPeriodChanges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Total other comprehensive income (loss) | (5)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (7)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Ending balance | $ 39 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | $ 44 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | $ 44 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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