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General (Details)	Sep. 30, 2012
General [Abstract]
Ownership percentage in subsidiaries	100.00%

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- Definition

Consolidated Financial Ownership Wholly Owned Subsidiary Percentage

+ References

No definition available.

+ Details

Name:	efsi_ConsolidatedFinancialOwnershipWhollyOwnedSubsidiaryPercentage
Namespace Prefix:	efsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

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