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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
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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 + References No definition available. + Details
Name: | efsi_CollateralizedLettersOfCreditOutstanding
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 + References 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
Name: | efsi_InitialAdjustmentForTheAdoptionOfCreditLossesForUnfundedCommitments
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reserve credit losses for Unfunded Commitments + References 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
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration