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Nature of Banking Activities and Significant Accounting Policies (Components of Accumulated Other Comprehensive Income, Net of Deferred Taxes) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Unrealized Gain (Loss) on Securities, Balance at end of year | $ 1,466 efsi_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnSecuritiesNetOfTax | $ 547 efsi_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnSecuritiesNetOfTax | $ 3,822 efsi_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnSecuritiesNetOfTax |
Change in Fair Value of Interest Rate Swap, Balance at end of year | (190)efsi_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromInterestRateSwapNetOfTax | (286)efsi_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromInterestRateSwapNetOfTax | (418)efsi_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromInterestRateSwapNetOfTax |
Post Retirement Benefit Plan, Balance at end of year | 39 efsi_AccumulatedOtherComprehensiveIncomeLossPostRetirementBenefitPlanNetOfTax | 44 efsi_AccumulatedOtherComprehensiveIncomeLossPostRetirementBenefitPlanNetOfTax | 44 efsi_AccumulatedOtherComprehensiveIncomeLossPostRetirementBenefitPlanNetOfTax |
Total accumulated other comprehensive income | 1,315 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 305 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 3,448 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 2,931 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Unrealized Gain (Loss) on Securities, Change | 919 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | (3,275)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 560 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |
Change in Fair Value of Interest Rate Swap, Change | 96 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | 132 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |
Post Retirement Benefit Plan, Change | (5)efsi_OtherComprehensiveIncomeLossPostRetirementBenefitPlanNetOfTax | 0 efsi_OtherComprehensiveIncomeLossPostRetirementBenefitPlanNetOfTax |  |
Total other comprehensive income (loss) | $ 1,010 us-gaap_OtherComprehensiveIncomeLossNetOfTax | $ (3,143)us-gaap_OtherComprehensiveIncomeLossNetOfTax | $ 517 us-gaap_OtherComprehensiveIncomeLossNetOfTax |

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- Definition Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Interest Rate Swap Net Of Tax + References No definition available. + Details
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- Definition Accumulated Other Comprehensive Income (Loss), Post Retirement Benefit Plan, Net Of Tax + References No definition available. + Details
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- Definition Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Securities, Net Of Tax + References No definition available. + Details
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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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- Definition Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669619-108580 + Details
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