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Restrictions On Dividends, Loans, and Advances (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Disclosure Of Restrictions On Dividends Loans And Advances Disclosure [Abstract]
Number of years used for undistributed net income of the Bank	3 years
Retained earnings available for the payment of dividends	$ 21.8
Restricted net assets	85.6
Funds available for loans or advances	$ 11.6

X

- Definition

Funds Available For Loans Or Advances

+ References

No definition available.

+ Details

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

X

- Definition

Number Of Preceding Years Undistributed Net Income

+ References

No definition available.

+ Details

Name:	efsi_NumberOfPrecedingYearsUndistributedNetIncome
Namespace Prefix:	efsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restricted Equity In Net Assets Of Bank

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No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of dividends available for payment after computation of statutory restrictions on capital surplus.

+ References

No definition available.

+ Details

Name:	us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant