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Loans and Allowance for Loan Losses (Details Textual) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loan and Allowance For Loan Losses (Textual)    
Net of deferred loan fees and costs $ 1.8us-gaap_LoansAndLeasesReceivableDeferredIncome $ 1.8us-gaap_LoansAndLeasesReceivableDeferredIncome
Part of loans of 30 days or More past due as a percentage of total loan portfolio 0.91%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio 0.73%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio
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 0.75%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 0.64%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 0.16%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 0.09%sfst_PartOfLoansOfThirtyDaysOrMorePastDueAsPercentageOfAggregateLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember