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New Branch Construction (Details) (USD $) In Millions, unless otherwise specified	Aug. 03, 2012
New Branch Construction [Abstract]
Amount of contract to build branch	$ 1.2

X

- Definition

Amount Of Contract

+ References

No definition available.

+ Details

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

X

- Details

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