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Troubled Debt Restructurings (Schedule Of Troubled Debt Restructurings On Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 contract	Mar. 31, 2012 contract
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts	1	1
Pre-Modification Outstanding Recorded Investment	$ 184	$ 91
Post-Modification Outstanding Recorded Investment	184	91
Residential Equity Lines [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts	1
Pre-Modification Outstanding Recorded Investment	184
Post-Modification Outstanding Recorded Investment	184
Residential Single Family [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of Contracts		1
Pre-Modification Outstanding Recorded Investment		91
Post-Modification Outstanding Recorded Investment		$ 91

X

- Definition

Troubled debt restructuring modifications number of contracts.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:	efsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of investment in financing receivables (after modification) modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in financing receivables (before modification) modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524

+ Details

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