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Stock-Based Compensation (Details Textual) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 21, 2000
May 20, 2014
May 18, 2010
Dec. 31, 2011
Stock-Based Compensation (Textual)              
Unrecognized compensation cost $ 798,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions            
Recognized weighted average period 1 year 9 months 18 days            
Fair value of stock option grants $ 3.30us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue $ 2.81us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue $ 2.83us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue        
Stock option plan [Member]              
Stock-Based Compensation (Textual)              
Number of stock option available for grant       436,424us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
     
Option expiration period       10 years      
Shares Outstanding 659,979us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
617,181us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
         
Aggregate Intrinsic Value Outstanding 6,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
3,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
         
Shares Options exercisable at year-end 432,055us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
346,509us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
         
Aggregate Intrinsic Value Options exercisable at year-end 4,400,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
2,200,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
         
2010 incentive plan [Member]              
Stock-Based Compensation (Textual)              
Number of stock option available for grant         566,025us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= sfst_TwoThousandTenIncentivePlanMember
366,025us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= sfst_TwoThousandTenIncentivePlanMember
 
Option expiration period           10 years  
Adjusted percentage of stock dividends           10.00%sfst_AdjustedPercentageOfStockDividends
/ us-gaap_PlanNameAxis
= sfst_TwoThousandTenIncentivePlanMember
 
Additional shares of common stock         200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherShareIncreaseDecrease
/ us-gaap_PlanNameAxis
= sfst_TwoThousandTenIncentivePlanMember
   
Restricted stock plan [Member]              
Stock-Based Compensation (Textual)              
Number of stock option available for grant 14,049us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= sfst_RestrictedStockPlanMember
           
Number of shares authorized under the restricted stock plan     13,310us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= sfst_RestrictedStockPlanMember
      13,310us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= sfst_RestrictedStockPlanMember
Shares issued under provision of issuance of shares of restricted stock           79,860sfst_SharesIssuedUnderProvisionOfIssuanceOfSharesOfRestrictedStock
/ us-gaap_PlanNameAxis
= sfst_RestrictedStockPlanMember
 
Unrecognized compensation cost $ 501,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_PlanNameAxis
= sfst_RestrictedStockPlanMember
           
Recognized weighted average period 1 year 10 months 24 days