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Other Real Estate Owned Narrative (Details) $ in Millions	Mar. 31, 2018 contract	Dec. 31, 2017 USD ($) contract
Receivables [Abstract]
Mortgage Loans In Process Of Foreclosure Number | contract	0	1
Mortgage Loans in Process of Foreclosure, Amount | $		$ 4.1

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
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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL49126937-111524

+ Details

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

X

- References

No definition available.

+ Details

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