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Other Real Estate Owned Narrative (Details) $ in Thousands	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Receivables [Abstract]
Mortgage Loans In Process Of Foreclosure Number | contract	2	1
Mortgage Loans in Process of Foreclosure, Amount | $	$ 334	$ 71

X

- Definition

Mortgage Loans In Process Of Foreclosure Number

+ References

No definition available.

+ Details

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Namespace Prefix:	efsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL49126937-111524

+ Details

Name:	us-gaap_MortgageLoansInProcessOfForeclosureAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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