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Derivative Instruments and Hedging Activities (Narrative) (Details) (Interest Rate Swap [Member], USD $) | 12 Months Ended
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Dec. 31, 2014
Interest Rate Swap [Member] |
Derivative [Line Items] |
Agreement related to the outstanding trust preferred capital notes, date | Dec. 04, 2008
Agreement effective, date | Dec. 01, 2008
Notional amount of derivatives | $ 7,000,000.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Agreement expiration date | Dec. 01, 2016
Fixed interest rate of derivative | 2.85%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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- Definition Derivative effective dates. + References No definition available. + Details
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Namespace Prefix: | efsi_
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Balance Type: | na
Period Type: | duration

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
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Period Type: | instant

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
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Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration