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Borrowings (Summary of Information Related to Federal Funds Purchased) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Advances from Federal Home Loan Banks [Abstract] |  |
Average balance during the year | $ 1,154 | $ 1,865
Average interest rate during the year | 0.92% | 1.08%
Maximum month-end balance during the year | $ 8,329 | $ 10,245
Gross lines of credit at year-end | 36,000 | 36,000
Unused lines of credit at year-end | $ 36,000 | $ 36,000

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- Definition Federal Funds Purchased Activity For Year Average Balance Of Agreements Outstanding + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Federal Funds Purchased Activity For Year Average Interest Rate For Year + References No definition available. + Details
Name: | efsi_FederalFundsPurchasedActivityForYearAverageInterestRateForYear
Namespace Prefix: | efsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Federal Funds Purchased Activity For Year Gross Lines Of Credit + References No definition available. + Details
Name: | efsi_FederalFundsPurchasedActivityForYearGrossLinesOfCredit
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Federal Funds Purchased Activity For Year Maximum Outstanding At Any Month End + References No definition available. + Details
Name: | efsi_FederalFundsPurchasedActivityForYearMaximumOutstandingAtAnyMonthEnd
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Federal Funds Purchased Activity For Year Unused Lines Of Credit + References No definition available. + Details
Name: | efsi_FederalFundsPurchasedActivityForYearUnusedLinesOfCredit
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AdvancesFromFederalHomeLoanBanksAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration