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General (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Ownership percentage in subsidiaries		100.00%
Cumulative effect period of adoption, adjustment	$ (477)

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- Definition

Consolidated Financial Ownership Wholly Owned Subsidiary Percentage

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of cumulative effect period of adoption, adjustment

+ References

No definition available.

+ Details

Name:	efsi_CumulativeEffectPeriodOfAdoptionAdjustment
Namespace Prefix:	efsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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