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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Collateralized letters of credit outstanding	$ 3,800
Excess of insurance limits held in cash accounts	9,000
initial adjustment for the adoption of credit losses for Unfunded Commitments	406
Reserve credit losses for Unfunded Commitments	$ 479	$ 65

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- Definition

Collateralized Letters Of Credit Outstanding

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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

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

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No definition available.

+ Details

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

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- Definition

initial adjustment for the adoption of credit losses for Unfunded Commitments

+ References

No definition available.

+ Details

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Namespace Prefix:	efsi_
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Balance Type:	debit
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X

- Definition

Reserve credit losses for Unfunded Commitments

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No definition available.

+ Details

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

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- References

No definition available.

+ Details

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