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New Branch Construction (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 store | Aug. 03, 2012
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New Branch Construction [Abstract] |  |
Amount of contract to build branch |  | $ 1.2
Number of retail branches | 12 |

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

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant