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Loans and Allowance for Loan Losses (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans $ 575,482us-gaap_LoansAndLeasesReceivableCommercial $ 511,738us-gaap_LoansAndLeasesReceivableCommercial
Outstanding consumer loans 295,964us-gaap_LoansAndLeasesReceivableConsumer 221,918us-gaap_LoansAndLeasesReceivableConsumer
Owner occupied [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 191,061us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 185,129us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Non-owner occupied RE [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 183,440us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 166,016us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Real estate [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 146,859us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 110,590us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Home equity [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 95,629us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 78,479us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember
Construction [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 50,995us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 30,906us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Outstanding consumer loans 39,226us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 19,888us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Business [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 149,986us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 129,687us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Other [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 14,250us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 12,961us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Pass [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 546,441us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 471,749us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Outstanding consumer loans 288,393us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 214,526us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Owner occupied [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 184,158us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 176,320us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Pass [Member] | Non-owner occupied RE [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 173,711us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 147,378us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Pass [Member] | Real estate [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 144,070us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 106,693us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Pass [Member] | Home equity [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 91,084us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 75,304us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember
Pass [Member] | Construction [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 48,140us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 27,797us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Outstanding consumer loans 39,226us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 19,888us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Pass [Member] | Business [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 140,432us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 120,254us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Pass [Member] | Other [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 14,013us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 12,641us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Special Mention [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 13,255us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 17,179us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Outstanding consumer loans 4,360us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 3,843us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Owner occupied [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 5,035us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 5,563us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Special Mention [Member] | Non-owner occupied RE [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 3,376us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 7,987us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Special Mention [Member] | Real estate [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 953us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 1,455us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Special Mention [Member] | Home equity [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 3,268us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 2,176us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember
Special Mention [Member] | Construction [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 129us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		   
Outstanding consumer loans      
Special Mention [Member] | Business [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 4,715us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 3,629us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Special Mention [Member] | Other [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 139us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 212us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Substandard [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 15,786us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 22,810us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Outstanding consumer loans 3,211us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 3,549us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Owner occupied [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 1,868us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 3,246us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Substandard [Member] | Non-owner occupied RE [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 6,353us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 10,651us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Substandard [Member] | Real estate [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 1,836us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 2,442us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Substandard [Member] | Home equity [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 1,277us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember		 999us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_HomeEquityLoanMember
Substandard [Member] | Construction [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 2,726us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 3,109us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Outstanding consumer loans      
Substandard [Member] | Business [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 4,839us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 5,804us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Substandard [Member] | Other [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 98us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 108us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Doubtful [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans      
Outstanding consumer loans      
Doubtful [Member] | Owner occupied [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans      
Doubtful [Member] | Non-owner occupied RE [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans      
Doubtful [Member] | Real estate [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans      
Doubtful [Member] | Home equity [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans      
Doubtful [Member] | Construction [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans      
Outstanding consumer loans      
Doubtful [Member] | Business [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans      
Doubtful [Member] | Other [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans      
Loss [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans      
Loss [Member] | Real estate [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans      
Loss [Member] | Home equity [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans      
Loss [Member] | Construction [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans      
Loss [Member] | Other [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans