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Loans and Allowance for Loan Losses (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Loan and Allowance For Loan Losses (Textual)    
Part of loans of 30 days or More past due as a percentage of total loan portfolio 0.73%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio 1.30%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio
Loans over 90 days past due and still accruing      
Real estate loan percentage of total loan 81.10%sfst_RealEstateLoanPercentageOfAggregateLoan 80.60%sfst_RealEstateLoanPercentageOfAggregateLoan
Consumer loans percentage of total real estate loan 39.80%sfst_ConsumerLoansPercentageOfAggregateRealEstateLoan  
Mortgage loan pledged as collateral for advances from FHLB 241,100,000sfst_MortgageLoanPledgedAsCollateralForAdvancesFromFhlb  
Foregone interest income on non accrual loans 414,000sfst_ForegoneInterestIncomeOnNonAccrualLoans 543,000sfst_ForegoneInterestIncomeOnNonAccrualLoans
Loans which exceed supervision loan to value limits Approximately $93.4 million, or 10.7% of our loans had loan-to-value ratios which exceeded regulatory supervisory limits.  
Loan with loan to value ratio of greater than 100% Which 100 loans totaling approximately $40.5 million had loan-to-value ratios of 100% or more.  
Commercial loans percentage of total real estate loan 60.20%sfst_CommercialLoansPercentageOfAggregateRealEstateLoan  
Net of deferred loan fees and costs $ 1,800,000us-gaap_LoansAndLeasesReceivableDeferredIncome $ 1,300,000us-gaap_LoansAndLeasesReceivableDeferredIncome
Owner occupied [Member]    
Loan and Allowance For Loan Losses (Textual)    
Commercial loans percentage of total real estate loan 21.90%sfst_CommercialLoansPercentageOfAggregateRealEstateLoan
/ us-gaap_LongtermDebtTypeAxis
= sfst_OwnerOccupiedReMember
 
Non-owner occupied [Member]    
Loan and Allowance For Loan Losses (Textual)    
Commercial loans percentage of total real estate loan 21.10%sfst_CommercialLoansPercentageOfAggregateRealEstateLoan
/ us-gaap_LongtermDebtTypeAxis
= sfst_NonOwnerOccupiedReMember
 
Construction [Member]    
Loan and Allowance For Loan Losses (Textual)    
Commercial loans percentage of total real estate loan 5.80%sfst_CommercialLoansPercentageOfAggregateRealEstateLoan
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
 
Commercial [Member]    
Loan and Allowance For Loan Losses (Textual)    
Part of loans of 30 days or More past due as a percentage of total loan portfolio 0.64%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
1.02%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Consumer [Member]    
Loan and Allowance For Loan Losses (Textual)    
Part of loans of 30 days or More past due as a percentage of total loan portfolio 0.09%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
0.28%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember