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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements For Certain Financial Assets) (Details) | 3 Months Ended
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Mar. 31, 2013
Impaired Loans [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 12.00%
Other Real Estate Owned [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 7.00%
Maximum [Member] | Impaired Loans [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 25.00%
Maximum [Member] | Other Real Estate Owned [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 12.00%
Minimum [Member] | Impaired Loans [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 6.00%
Minimum [Member] | Other Real Estate Owned [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 6.00%

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- Definition Quantitative Information Level Three Nonrecurring Basis Range + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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