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Capital Requirements - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021
Regulatory Capital Requirements [Abstract]
Capital conservation buffer in percentage	3.30%
Capital conservation buffer maintained	2.50%

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- Definition

Capital conservation buffer in percentage.

+ References

No definition available.

+ Details

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- Definition

Capital conservation buffer maintained.

+ References

No definition available.

+ Details

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Namespace Prefix:	efsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	srt_
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Period Type:	duration