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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, 2020 | Dec. 31, 2019
Advances From Federal Home Loan Banks [Abstract] |  |
Average balance during the year | $ 1 | $ 1,074
Average interest rate during the year | 0.61% | 2.91%
Maximum month-end balance during the year |  | $ 10,780
Gross lines of credit at year-end | $ 28,000 | 28,000
Unused lines of credit at year-end | $ 28,000 | $ 28,000

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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