XML 107 R93.htm IDEA: XBRL DOCUMENT
v3.19.1

Dividend Investment Plan (Details) | Dec. 31, 2015
--- | ---
Dividend Investment Plan [Abstract] |
Percentage of fair market value | 95.00%

X
- Definition Dividend Investment Plan [Abstract] + References No definition available. + Details
Name: | efsi_DividendInvestmentPlanAbstract
Namespace Prefix: | efsi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage OF Fair Market Value Purchase Additional Shares Common Stock + References No definition available. + Details
Name: | efsi_PercentageOfFairMarketValuePurchaseAdditionalSharesCommonStock
Namespace Prefix: | efsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant