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Loans and Allowance for Loan Losses (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans $ 605,073us-gaap_LoansAndLeasesReceivableCommercial $ 575,482us-gaap_LoansAndLeasesReceivableCommercial
Outstanding consumer loans 304,248us-gaap_LoansAndLeasesReceivableConsumer 295,964us-gaap_LoansAndLeasesReceivableConsumer
Owner occupied RE [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 203,921us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 191,061us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember
Non-owner occupied RE [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 190,816us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 183,440us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Real estate [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 153,517us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 146,859us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember
Home equity [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 95,321us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember		 95,629us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember
Construction [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 48,172us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 50,995us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Outstanding consumer loans 41,267us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 39,226us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Business [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 162,164us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 149,986us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Other [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 14,143us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 14,250us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Pass [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 577,935us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember		 546,441us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
Outstanding consumer loans 297,026us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember		 288,393us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
Pass [Member] | Owner occupied RE [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 198,503us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 184,158us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= 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 180,577us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 173,711us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Pass [Member] | Real estate [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 150,687us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 144,070us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= 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 91,100us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember		 91,084us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember
Pass [Member] | Construction [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 46,105us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 48,140us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Outstanding consumer loans 41,267us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 39,226us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
Pass [Member] | Business [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 152,750us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 140,432us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Pass [Member] | Other [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 13,972us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 14,013us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Special Mention [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 11,929us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember		 13,255us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
Outstanding consumer loans 3,906us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember		 4,360us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Owner occupied RE [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 3,796us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 5,035us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= 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 3,351us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 3,376us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= 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 794us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 953us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= 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 2,976us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember		 3,268us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember
Special Mention [Member] | Construction [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 129us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 129us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= 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 4,653us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 4,715us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Special Mention [Member] | Other [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 136us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 139us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SpecialMentionMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember
Substandard [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 15,209us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember		 15,786us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
Outstanding consumer loans 3,316us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember		 3,211us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
Substandard [Member] | Owner occupied RE [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 1,622us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_OwnerOccupiedReMember		 1,868us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= 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 6,888us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember		 6,353us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_NonOwnerOccupiedReMember
Substandard [Member] | Real estate [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 2,036us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_RealEstateMember		 1,836us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= 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 1,245us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember		 1,277us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_HomeEquityLoanMember
Substandard [Member] | Construction [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding commercial loans 1,938us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember		 2,726us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= 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 4,761us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember		 4,839us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_BusinessLoanMember
Substandard [Member] | Other [Member]    
Outstanding commercial and consumer loans by risk category    
Outstanding consumer loans 35us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_SubstandardMember
/ us-gaap_ProductOrServiceAxis
= sfst_OtherConsumerMember		 98us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_CreditRatingAMBestAxis
= 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 RE [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