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Condensed Financial Information - Parent Company Only (Schedule of Condensed Cash Flows Statement) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash Flows from Operating Activities |  |  |
Net income | $ 7,140 us-gaap_NetIncomeLoss | $ 7,158 us-gaap_NetIncomeLoss | $ 6,550 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
(Gain) on the sale of securities | (990)us-gaap_GainLossOnSaleOfSecuritiesNet | (465)us-gaap_GainLossOnSaleOfSecuritiesNet | (45)us-gaap_GainLossOnSaleOfSecuritiesNet
(Discount accretion) premium amortization on securities | 124 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments | 146 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments | 191 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Changes in assets and liabilities: |  |  |
(Increase) decrease in other assets | (451)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (1,392)us-gaap_IncreaseDecreaseInOtherOperatingAssets | 602 us-gaap_IncreaseDecreaseInOtherOperatingAssets
Increase (decrease) in other liabilities | (179)us-gaap_IncreaseDecreaseInOperatingLiabilities | 183 us-gaap_IncreaseDecreaseInOperatingLiabilities | 937 us-gaap_IncreaseDecreaseInOperatingLiabilities
Net cash provided by operating activities | 7,286 us-gaap_NetCashProvidedByUsedInOperatingActivities | 8,219 us-gaap_NetCashProvidedByUsedInOperatingActivities | 11,433 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities |  |  |
Purchases of securities available for sale | (8,693)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (26,863)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (12,271)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from the sale of securities available for sale | 8,546 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 3,987 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 3,357 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from maturities of securities available for sale | 10,837 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities | 18,389 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities | 20,997 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Net cash (used in) investing activities | (19,203)us-gaap_NetCashProvidedByUsedInInvestingActivities | (31,491)us-gaap_NetCashProvidedByUsedInInvestingActivities | (1,622)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities |  |  |
Cash dividends paid | (1,944)us-gaap_PaymentsOfDividendsCommonStock | (1,909)us-gaap_PaymentsOfDividendsCommonStock | (1,805)us-gaap_PaymentsOfDividendsCommonStock
Issuance of common stock, employee benefit plan | 202 efsi_IssuanceOfCommonStockEmployeeBenefitPlan | 179 efsi_IssuanceOfCommonStockEmployeeBenefitPlan | 107 efsi_IssuanceOfCommonStockEmployeeBenefitPlan
Stock options exercised | 0 us-gaap_ProceedsFromStockOptionsExercised | 69 us-gaap_ProceedsFromStockOptionsExercised | 0 us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by (used in) financing activities | 32,238 us-gaap_NetCashProvidedByUsedInFinancingActivities | (11,175)us-gaap_NetCashProvidedByUsedInFinancingActivities | 16,938 us-gaap_NetCashProvidedByUsedInFinancingActivities
Increase in cash | 20,321 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (34,447)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 26,749 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents |  |  |
Beginning | 14,243 us-gaap_CashAndCashEquivalentsAtCarryingValue | 48,690 us-gaap_CashAndCashEquivalentsAtCarryingValue | 21,941 us-gaap_CashAndCashEquivalentsAtCarryingValue
Ending | 34,564 us-gaap_CashAndCashEquivalentsAtCarryingValue | 14,243 us-gaap_CashAndCashEquivalentsAtCarryingValue | 48,690 us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company [Member] |  |  |
Cash Flows from Operating Activities |  |  |
Net income | 7,140 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,158 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,550 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
(Gain) on the sale of securities | (283)us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stock-based compensation expense | 290 us-gaap_EmployeeBenefitsAndShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 305 us-gaap_EmployeeBenefitsAndShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 242 us-gaap_EmployeeBenefitsAndShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Discount accretion) premium amortization on securities | 0 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Undistributed earnings of subsidiary bank | (5,630)efsi_UndistributedEarningsOfSubsidiaryBank / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,423)efsi_UndistributedEarningsOfSubsidiaryBank / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,890)efsi_UndistributedEarningsOfSubsidiaryBank / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Changes in assets and liabilities: |  |  |
(Increase) decrease in other assets | (10)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 138 us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 30 us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Increase (decrease) in other liabilities | 1 us-gaap_IncreaseDecreaseInOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1 us-gaap_IncreaseDecreaseInOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2)us-gaap_IncreaseDecreaseInOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by operating activities | 1,508 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 178 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 929 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows from Investing Activities |  |  |
Purchases of securities available for sale | (761)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,044)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from the sale of securities available for sale | 1,865 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Proceeds from maturities of securities available for sale | 405 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,458 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,945 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash (used in) investing activities | 1,509 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 414 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,945 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows from Financing Activities |  |  |
Cash dividends paid | (1,944)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,909)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,805)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Issuance of common stock, employee benefit plan | 202 efsi_IssuanceOfCommonStockEmployeeBenefitPlan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 179 efsi_IssuanceOfCommonStockEmployeeBenefitPlan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 107 efsi_IssuanceOfCommonStockEmployeeBenefitPlan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stock options exercised | 0 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 69 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) financing activities | (1,742)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,661)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,698)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Increase in cash | 1,275 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,069)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,176 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and Cash Equivalents |  |  |
Beginning | 923 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,992 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 816 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Ending | $ 2,198 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 923 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1,992 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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