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Loans and Allowance for Loan Losses (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Summary of key information for impaired loans    
Unpaid Principal Balance $ 19,182us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance $ 19,865us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Impaired Loans 14,861us-gaap_ImpairedFinancingReceivableRecordedInvestment 15,212us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired loans with related allowance for loan losses 10,151us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment 10,636us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Related allowance for loan losses 5,028us-gaap_ImpairedFinancingReceivableRelatedAllowance 5,046us-gaap_ImpairedFinancingReceivableRelatedAllowance
Commercial [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 16,908us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 17,588us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Impaired Loans 12,587us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 12,935us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Impaired loans with related allowance for loan losses 8,197us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 8,680us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Related allowance for loan losses 3,944us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 3,960us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Commercial [Member] | Owner occupied RE [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 1,079us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 1,122us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Impaired Loans 1,079us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 1,122us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Impaired loans with related allowance for loan losses 1,079us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 1,060us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Related allowance for loan losses 373us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 371us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Commercial [Member] | Non-owner occupied RE [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 9,219us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 5,813us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Impaired Loans 5,308us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 4,522us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Impaired loans with related allowance for loan losses 3,509us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 2,777us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Related allowance for loan losses 918us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 801us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Commercial [Member] | Construction [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 1,938us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 5,268us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Impaired Loans 1,938us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 2,726us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Impaired loans with related allowance for loan losses 532us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 1,315us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Related allowance for loan losses 156us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 324us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Commercial [Member] | Business [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 4,672us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 5,385us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Impaired Loans 4,262us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 4,565us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Impaired loans with related allowance for loan losses 3,077us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 3,528us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Related allowance for loan losses 2,497us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 2,464us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Consumer [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 2,274us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 2,277us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Impaired Loans 2,274us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 2,277us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Impaired loans with related allowance for loan losses 1,954us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 1,956us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Related allowance for loan losses 1,084us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 1,086us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Consumer [Member] | Real estate [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 1,706us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 1,620us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Impaired Loans 1,706us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 1,620us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Impaired loans with related allowance for loan losses 1,386us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 1,299us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Related allowance for loan losses 672us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 585us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Consumer [Member] | Home equity [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 346us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember		 347us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember
Impaired Loans 346us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember		 347us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember
Impaired loans with related allowance for loan losses 346us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember		 347us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember
Related allowance for loan losses 190us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember		 191us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember
Consumer [Member] | Construction [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance      
Impaired Loans      
Impaired loans with related allowance for loan losses      
Related allowance for loan losses     
Consumer [Member] | Other [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 222us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 310us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Impaired Loans 222us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 310us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Impaired loans with related allowance for loan losses 222us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 310us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Related allowance for loan losses $ 222us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 $ 310us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember