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Borrowings (Summary of Information Related to Securities Sold Under Agreement to Repurchase) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Advances from Federal Home Loan Banks [Abstract] |  |
Balance at year-end | $ 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | $ 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Average balance during the year | 0 efsi_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageBalanceOfAgreementsOutstanding | 795 efsi_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageBalanceOfAgreementsOutstanding
Average interest rate during the year | 0.00%efsi_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageInterestRateForYear | 3.58%efsi_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageInterestRateForYear
Maximum month-end balance during the year | 0 efsi_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearMaximumOutstandingAtAnyMonthEnd | 0 efsi_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearMaximumOutstandingAtAnyMonthEnd
Carrying value | 0 efsi_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseCarryingValue | 0 efsi_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseCarryingValue
Fair value | $ 0 us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure | $ 0 us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure

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- Definition Securities Loaned Or Sold Under Agreements To Repurchase Carrying Value + References No definition available. + Details
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- Definition Securities Sold Under Agreements To Repurchase Activity For Year Average Balance Of Agreements Outstanding + References No definition available. + Details
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- Definition Securities Sold Under Agreements To Repurchase Activity For Year Average Interest Rate For Year + References No definition available. + Details
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- Definition Securities Sold Under Agreements To Repurchase Activity For Year Maximum Outstanding At Any Month End + References No definition available. + Details
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- Details
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- Definition Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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Period Type: | instant

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7472769&loc=d3e9760-107771 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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