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Preferred and Common Stock (Details) (USD $)
0 Months Ended 1 Months Ended 2 Months Ended 12 Months Ended
Nov. 12, 2014
Jan. 27, 2014
Sep. 30, 2012
Jun. 28, 2012
Feb. 27, 2009
Jul. 25, 2012
Dec. 31, 2014
Dec. 31, 2013
Apr. 01, 2013
Jan. 03, 2013
Preferred and Common Stock (Textual)                    
Shares of fixed rate cumulative perpetual preferred stock, series T, shares sold         17,299sfst_NumberOfSharesOfFixedRateCumulativePerpetualPreferredStockSharesSold          
Warrant issued with option to purchase additional common shares         399,970.34sfst_NumberOfAdditionalCommonSharesIssuableUponConversionOfWarrants          
Purchase price of fixed rate cumulative perpetual preferred stock, Series T         $ 17,300,000sfst_AggregatePurchasePriceOfFixedRateCumulativePerpetualPreferredStockAndWarrantIssued          
Cumulative dividend rate for first five years         5.00%sfst_CumulativeDividendRateForInitialTerm          
Cumulative dividend rate after first five years         9.00%sfst_CumulativeDividendRateAfterInitialTerm          
Capital purchase program warrant term         10 years          
Exercise price of CPP warrant         $ 6.487invest_InvestmentWarrantsExercisePrice          
Preferred stock, par value             $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare    
Number of preferred stock repurchased       1,000us-gaap_TreasuryStockSharesAcquired     11,242us-gaap_TreasuryStockSharesAcquired      
Preferred stock, shares outstanding       16,299us-gaap_PreferredStockSharesOutstanding       15,299us-gaap_PreferredStockSharesOutstanding    
Operating costs incurred as a result of TARP auction     130,000us-gaap_OperatingCostsAndExpenses              
Balance sheet impact - Shareholders' equity     904,000us-gaap_StockholdersEquityOther              
Increase in retained earnings related to discount on the shares repurchased     96,000sfst_IncreaseInRetainedEarningsRelatedToDiscountOnSharesRepurchased              
Decrease in preferred stock value     1,000,000sfst_DecreaseInPreferredStockValue              
Warrant repurchase, value           1,100,000sfst_WarrantRepurchasedValue        
Difference between fair value of warrant and repurchase value           343,000sfst_WarrantFairValueAndRepurchaseValueDifference        
Remaining accretion           180,000us-gaap_TemporaryEquityAccretionToRedemptionValue        
Preferred stock, redemption price per share   $ 1,000us-gaap_PreferredStockRedemptionPricePerShare                
Redeemable preferred stock                 1,000,000sfst_RedeemablePreferredStock 1,000,000sfst_RedeemablePreferredStock
Issuance of common stock, Shares 1,380,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 475,000us-gaap_StockIssuedDuringPeriodSharesNewIssues                
Offering price per share $ 14.40us-gaap_SharesIssuedPricePerShare $ 13.00us-gaap_SharesIssuedPricePerShare                
Redemption of series T Preferred preferred stock, shares   4,057sfst_RedemptionOfPreferredStockShares                
Net proceeds from offering $ 18,400,000us-gaap_ProceedsFromIssuanceInitialPublicOffering                  
Over-Allotment Option [Member]                    
Preferred and Common Stock (Textual)                    
Issuance of common stock, Shares 180,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_OverAllotmentOptionMember