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Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 290us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense	$ 305us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense	$ 242us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense
Grant date fair value of vested Restricted Stock	291efsi_DeferredCompensationArrangementGrantDateFairValueOfVestedRestrictedStock	251efsi_DeferredCompensationArrangementGrantDateFairValueOfVestedRestrictedStock
Unrecognized compensation cost related to unvested Restricted Stock	$ 64efsi_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

X

- Definition

Deferred Compensation Arrangement Grant Date Fair Value Of Vested Restricted Stock

+ References

No definition available.

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- Definition

Deferred Compensation Arrangements Unrecognized Compensation Cost Related To Unvested Restricted Stock

+ References

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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

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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

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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)

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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

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