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Other Real Estate Owned Narrative (Details)	Sep. 30, 2022 USD ($) Contract	Dec. 31, 2021 Contract
Real Estate [Abstract]
Mortgage loan totaling collateralized | $	$ 116
Mortgage Loans In Process Of Foreclosure Number | Contract	1	0

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- Definition

Mortgage loan totaling collateralized

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No definition available.

+ Details

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

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- Definition

Mortgage Loans In Process Of Foreclosure Number

+ References

No definition available.

+ Details

Name:	efsi_MortgageLoansInProcessOfForeclosureNumber
Namespace Prefix:	efsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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