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Condensed Financial Information - Parent Company Only (Schedule of Condensed Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Assets |  |  |  |
Due from banks | $ 9,075 us-gaap_CashAndDueFromBanks | $ 9,295 us-gaap_CashAndDueFromBanks |  |
Securities available for sale | 94,165 us-gaap_AvailableForSaleSecurities | 102,598 us-gaap_AvailableForSaleSecurities |  |
Other assets | 9,436 us-gaap_OtherAssets | 9,766 us-gaap_OtherAssets |  |
Total assets | 626,830 us-gaap_Assets | 586,444 us-gaap_Assets |  |
Liabilities and Shareholders’ Equity |  |  |  |
Trust preferred capital notes | 7,217 efsi_PreferredCapitalNotesOfTrust | 7,217 efsi_PreferredCapitalNotesOfTrust |  |
Other Liabilities | 2,665 us-gaap_OtherLiabilities | 2,984 us-gaap_OtherLiabilities |  |
Total liabilities | 553,698 us-gaap_Liabilities | 520,038 us-gaap_Liabilities |  |
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |
Preferred stock | 0 us-gaap_PreferredStockValue | 0 us-gaap_PreferredStockValue |  |
Common stock issued | 8,621 us-gaap_CommonStockValue | 8,482 us-gaap_CommonStockValue |  |
Additional Paid in Capital | 12,618 us-gaap_AdditionalPaidInCapital | 11,537 us-gaap_AdditionalPaidInCapital |  |
Retained earnings | 50,578 us-gaap_RetainedEarningsAccumulatedDeficit | 46,082 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Accumulated other comprehensive income | 1,315 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 305 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 3,448 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 2,931 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total shareholders’ equity | 73,132 us-gaap_StockholdersEquity | 66,406 us-gaap_StockholdersEquity | 63,706 us-gaap_StockholdersEquity | 58,090 us-gaap_StockholdersEquity
Total liabilities and shareholders’ equity | 626,830 us-gaap_LiabilitiesAndStockholdersEquity | 586,444 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash held in subsidiary bank | 1,694 efsi_CashHeldInSubsidiaryBank / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 419 efsi_CashHeldInSubsidiaryBank / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Due from banks | 504 us-gaap_CashAndDueFromBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 504 us-gaap_CashAndDueFromBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Securities available for sale | 1,383 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,893 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in subsidiaries, at cost, plus undistributed net income | 76,423 efsi_InvestmentInSubsidiariesAtCostPlusUndistributedNetIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 69,692 efsi_InvestmentInSubsidiariesAtCostPlusUndistributedNetIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 661 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 575 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 80,665 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 74,083 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities and Shareholders’ Equity |  |  |  |
Trust preferred capital notes | 7,217 efsi_PreferredCapitalNotesOfTrust / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,217 efsi_PreferredCapitalNotesOfTrust / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other Liabilities | 316 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 460 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 7,533 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,677 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |
Common stock issued | 8,621 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,482 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Additional Paid in Capital | 12,618 us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11,537 us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 50,578 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 46,082 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accumulated other comprehensive income | 1,315 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 305 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total shareholders’ equity | 73,132 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 66,406 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and shareholders’ equity | $ 80,665 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 74,083 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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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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