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Earnings Per Common Share (Details Textual)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Common Share (Textual)      
Antidilutive securities excluded from computation of earnings per share, amount 109,303us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 34,624us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 74,802us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Percentage of stock dividend on stock options and restricted stock     10.00%sfst_PercentageOfStockDividendOnStockOptionsAndRestrictedStock