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Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 290 us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense | $ 305 us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense | $ 242 us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense
Grant date fair value of vested Restricted Stock | 291 efsi_DeferredCompensationArrangementGrantDateFairValueOfVestedRestrictedStock | 251 efsi_DeferredCompensationArrangementGrantDateFairValueOfVestedRestrictedStock |
Unrecognized compensation cost related to unvested Restricted Stock | $ 64 efsi_DeferredCompensationArrangementsUnrecognizedCompensationCostRelatedToUnvestedRestrictedStock |  |
Weighted-average period for unrecognized compensation cost to be recognized | 1 year |  |
Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Option expiration period | 10 years |  |
Non-qualified Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Option expiration period | 10 years |  |
Restricted Stock [Member] | Outside Directors [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting service period of grants | 6 months |  |
Restricted Stock [Member] | Executive Officers [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting service period of grants | 3 years |  |

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- Definition Deferred Compensation Arrangement Grant Date Fair Value Of Vested Restricted Stock + References No definition available. + Details
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- Definition Deferred Compensation Arrangements Unrecognized Compensation Cost Related To Unvested Restricted Stock + References No definition available. + Details
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- Definition Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans). + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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