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Borrowings (Summary of Information Related to Federal Funds Purchased) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Advances from Federal Home Loan Banks [Abstract]    
Average balance during the year $ 1,865efsi_FederalFundsPurchasedActivityForYearAverageBalanceOfAgreementsOutstanding $ 270efsi_FederalFundsPurchasedActivityForYearAverageBalanceOfAgreementsOutstanding
Average interest rate during the year 1.08%efsi_FederalFundsPurchasedActivityForYearAverageInterestRateForYear 0.88%efsi_FederalFundsPurchasedActivityForYearAverageInterestRateForYear
Maximum month-end balance during the year 10,245efsi_FederalFundsPurchasedActivityForYearMaximumOutstandingAtAnyMonthEnd 5,616efsi_FederalFundsPurchasedActivityForYearMaximumOutstandingAtAnyMonthEnd
Gross lines of credit at year-end 36,000efsi_FederalFundsPurchasedActivityForYearGrossLinesOfCredit 36,000efsi_FederalFundsPurchasedActivityForYearGrossLinesOfCredit
Unused lines of credit at year-end $ 36,000efsi_FederalFundsPurchasedActivityForYearUnusedLinesOfCredit $ 36,000efsi_FederalFundsPurchasedActivityForYearUnusedLinesOfCredit