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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Derivative Instruments And Hedging Activities Disclosure [Abstract] |
Collateralized letters of credit outstanding | $ 7.8
Excess of insurance limits held in cash accounts | $ 3.7

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

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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