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Loans and Allowance for loan losses (Impaired loans by class) (Parenthetical) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Receivables [Abstract] |  |
Accrued interests and net deferred loan fees | $ 16 | $ 19

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- Definition Accrued interests and net deferred loan fees. + References No definition available. + Details
Name: | efsi_AccruedInterestsAndNetDeferredLoanFees
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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