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Loans and Allowance for loan losses (Impaired loans by class) (Parenthetical) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Receivables [Abstract]
Accrued interests and net deferred loan fees	$ 14	$ 17

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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