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Loans and Allowance for Loan Losses (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary of key information for impaired loans    
Unpaid Principal Balance $ 19,865us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance $ 20,291us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Impaired Loans 15,212us-gaap_ImpairedFinancingReceivableRecordedInvestment 16,382us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired loans with related allowance for loan losses 10,636us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment 14,143us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Related allowance for loan losses 5,046us-gaap_ImpairedFinancingReceivableRelatedAllowance 4,729us-gaap_ImpairedFinancingReceivableRelatedAllowance
Commercial [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 17,588us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 17,998us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Impaired Loans 12,935us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 14,111us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Impaired loans with related allowance for loan losses 8,680us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 12,453us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Related allowance for loan losses 3,960us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 3,833us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Commercial [Member] | Owner occupied RE [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 1,122us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 1,935us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Impaired Loans 1,122us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 1,935us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Impaired loans with related allowance for loan losses 1,060us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 1,666us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Related allowance for loan losses 371us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 333us-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 5,813us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 5,957us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Impaired Loans 4,522us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 5,622us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Impaired loans with related allowance for loan losses 2,777us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 6,125us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Related allowance for loan losses 801us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 1,441us-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 5,268us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 4,612us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Impaired Loans 2,726us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 1,870us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Impaired loans with related allowance for loan losses 1,315us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 1,855us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Related allowance for loan losses 324us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 246us-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 5,385us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 5,494us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Impaired Loans 4,565us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 4,684us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Impaired loans with related allowance for loan losses 3,528us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 2,807us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Related allowance for loan losses 2,464us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 1,813us-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 2,277us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 2,293us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Impaired Loans 2,277us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 2,271us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Impaired loans with related allowance for loan losses 1,956us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 1,690us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Related allowance for loan losses 1,086us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 896us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Consumer [Member] | Real estate [Member]    
Summary of key information for impaired loans    
Unpaid Principal Balance 1,620us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 1,829us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Impaired Loans 1,620us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 1,807us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Impaired loans with related allowance for loan losses 1,299us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 1,447us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Related allowance for loan losses 585us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 704us-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 347us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 239us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember
Impaired Loans 347us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 239us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember
Impaired loans with related allowance for loan losses 347us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 239us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember
Related allowance for loan losses 191us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 188us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_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 310us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 225us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Impaired Loans 310us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 225us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Impaired loans with related allowance for loan losses 310us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 4us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Related allowance for loan losses $ 310us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 $ 4us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember