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Loans and Allowance for Loan Losses (Details 6) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment $ 16,387us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment $ 16,056us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment $ 17,854us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Recognized interest income 456us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 671us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 629us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial [Member]      
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment 13,760us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 14,026us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 15,699us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Recognized interest income 380us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 554us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 559us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Commercial [Member] | Owner occupied RE [Member]      
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment 1,568us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 1,519us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 3,881us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Recognized interest income 47us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 47us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 17us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Commercial [Member] | Non-owner occupied RE [Member]      
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment 5,693us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 5,932us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 5,811us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Recognized interest income 104us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 261us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 392us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Commercial [Member] | Construction [Member]      
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment 1,977us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 2,054us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 2,127us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Recognized interest income 75us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 57us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 66us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Commercial [Member] | Business [Member]      
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment 4,522us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 4,521us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 3,880us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Recognized interest income 154us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 189us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 84us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Consumer [Member]      
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment 2,627us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 2,030us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 2,155us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Recognized interest income 76us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 117us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 70us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Consumer [Member] | Real estate [Member]      
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment 2,094us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 1,186us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 1,397us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Recognized interest income 53us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 100us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 44us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Consumer [Member] | Home equity [Member]      
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment 251us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 610us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 518us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember
Recognized interest income 10us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 8us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 12us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember
Consumer [Member] | Construction [Member]      
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment         
Recognized interest income         
Consumer [Member] | Other [Member]      
Average recorded investment and interest income recognized on impaired loans      
Average recorded investment 282us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 234us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 240us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Recognized interest income $ 13us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 $ 9us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 $ 14us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember