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Borrowings (Summary of Information Related to Federal Funds Purchased) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Advances from Federal Home Loan Banks [Abstract] |  |
Federal funds purchased | $ 0 | $ 1,871
Average balance during the year | $ 1,074 | $ 964
Average interest rate during the year | 2.91% | 2.63%
Maximum month-end balance during the year | $ 10,780 | $ 7,820
Gross lines of credit at year-end | 28,000 | 28,000
Unused lines of credit at year-end | $ 28,000 | $ 26,129

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- Definition Federal Funds Purchased Activity For Year Average Balance Of Agreements Outstanding + References No definition available. + Details
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- Definition Federal Funds Purchased Activity For Year Average Interest Rate For Year + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | num:percentItemType
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- Definition Federal Funds Purchased Activity For Year Gross Lines Of Credit + References No definition available. + Details
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- Definition Federal Funds Purchased Activity For Year Maximum Outstanding At Any Month End + References No definition available. + Details
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Namespace Prefix: | efsi_
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- Definition Federal Funds Purchased Activity For Year Unused Lines Of Credit + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
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- Definition Amount after offset of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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