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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Collateralized letters of credit outstanding	$ 10.2
Excess of insurance limits held in cash accounts	$ 7.6

X

- Definition

Collateralized Letters Of Credit Outstanding

+ References

No definition available.

+ Details

Name:	efsi_CollateralizedLettersOfCreditOutstanding
Namespace Prefix:	efsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Excess Of Insurance Limits Held In Cash Accounts In Other Commercial Banks

+ References

No definition available.

+ Details

Name:	efsi_ExcessOfInsuranceLimitsHeldInCashAccountsInOtherCommercialBanks
Namespace Prefix:	efsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration