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Deposits (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Deposits [Abstract]
Brokered Time Deposits Less Than $250000 Domestic	$ 12,900,000efsi_BrokeredTimeDepositsLessThan250000Domestic	$ 12,000,000efsi_BrokeredTimeDepositsLessThan250000Domestic
Deposit overdrafts reclassified as loans	$ 121,000us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1	$ 169,000us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1

X

- Definition

Brokered Time Deposits Less Than $250000 Domestic

+ References

No definition available.

+ Details

Name:	efsi_BrokeredTimeDepositsLessThan250000Domestic
Namespace Prefix:	efsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818

+ Details

Name:	us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_DepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration