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Loans and Allowance for Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Composition of loan portfolio    
Total commercial loans $ 605,073us-gaap_LoansAndLeasesReceivableCommercial $ 575,482us-gaap_LoansAndLeasesReceivableCommercial
Total consumer loans 304,248us-gaap_LoansAndLeasesReceivableConsumer 295,964us-gaap_LoansAndLeasesReceivableConsumer
Total gross loans, net of deferred fees 909,321us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 871,446us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Total gross loans, net of deferred fees, (Percentage) 100.00%sfst_LoansAndLeasesReceivableNetOfDeferredIncomePercentage 100.00%sfst_LoansAndLeasesReceivableNetOfDeferredIncomePercentage
Less allowance for loan losses (12,241)us-gaap_LoansAndLeasesReceivableAllowance (11,752)us-gaap_LoansAndLeasesReceivableAllowance
Total loans, net 897,080us-gaap_LoansAndLeasesReceivableNetReportedAmount 859,694us-gaap_LoansAndLeasesReceivableNetReportedAmount
Commercial [Member]    
Composition of loan portfolio    
Total commercial loans 605,073us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
575,482us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Total commercial loans, (Percentage) 66.50%sfst_LoansAndLeasesReceivableCommercialPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
66.00%sfst_LoansAndLeasesReceivableCommercialPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Total gross loans, net of deferred fees 605,073us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
575,482us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Commercial [Member] | Owner occupied RE [Member]    
Composition of loan portfolio    
Total commercial loans 203,921us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_OwnerOccupiedReMember
191,061us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_OwnerOccupiedReMember
Total commercial loans, (Percentage) 22.40%sfst_LoansAndLeasesReceivableCommercialPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_OwnerOccupiedReMember
21.90%sfst_LoansAndLeasesReceivableCommercialPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_OwnerOccupiedReMember
Commercial [Member] | Non-owner occupied RE [Member]    
Composition of loan portfolio    
Total commercial loans 190,816us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_NonOwnerOccupiedReMember
183,440us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_NonOwnerOccupiedReMember
Total commercial loans, (Percentage) 21.00%sfst_LoansAndLeasesReceivableCommercialPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_NonOwnerOccupiedReMember
21.10%sfst_LoansAndLeasesReceivableCommercialPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_NonOwnerOccupiedReMember
Commercial [Member] | Construction [Member]    
Composition of loan portfolio    
Total commercial loans 48,172us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
50,995us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
Total commercial loans, (Percentage) 5.30%sfst_LoansAndLeasesReceivableCommercialPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
5.80%sfst_LoansAndLeasesReceivableCommercialPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
Commercial [Member] | Business [Member]    
Composition of loan portfolio    
Total commercial loans 162,164us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_BusinessLoanMember
149,986us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_BusinessLoanMember
Total commercial loans, (Percentage) 17.80%sfst_LoansAndLeasesReceivableCommercialPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_BusinessLoanMember
17.20%sfst_LoansAndLeasesReceivableCommercialPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_BusinessLoanMember
Consumer [Member]    
Composition of loan portfolio    
Total consumer loans 304,248us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
295,964us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Total consumer loans, (Percentage) 33.50%sfst_LoansAndLeasesReceivableConsumerPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
34.00%sfst_LoansAndLeasesReceivableConsumerPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Total gross loans, net of deferred fees 304,248us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
295,964us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Consumer [Member] | Real estate [Member]    
Composition of loan portfolio    
Total consumer loans 153,517us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RealEstateMember
146,859us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RealEstateMember
Total consumer loans, (Percentage) 16.90%sfst_LoansAndLeasesReceivableConsumerPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RealEstateMember
16.90%sfst_LoansAndLeasesReceivableConsumerPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RealEstateMember
Consumer [Member] | Home equity [Member]    
Composition of loan portfolio    
Total consumer loans 95,321us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_HomeEquityLoanMember
95,629us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_HomeEquityLoanMember
Total consumer loans, (Percentage) 10.50%sfst_LoansAndLeasesReceivableConsumerPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_HomeEquityLoanMember
11.00%sfst_LoansAndLeasesReceivableConsumerPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_HomeEquityLoanMember
Consumer [Member] | Construction [Member]    
Composition of loan portfolio    
Total consumer loans 41,267us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
39,226us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
Total consumer loans, (Percentage) 4.50%sfst_LoansAndLeasesReceivableConsumerPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
4.50%sfst_LoansAndLeasesReceivableConsumerPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
Consumer [Member] | Other [Member]    
Composition of loan portfolio    
Total consumer loans $ 14,143us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_OtherConsumerMember
$ 14,250us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_OtherConsumerMember
Total consumer loans, (Percentage) 1.60%sfst_LoansAndLeasesReceivableConsumerPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_OtherConsumerMember
1.60%sfst_LoansAndLeasesReceivableConsumerPercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_LongtermDebtTypeAxis
= sfst_OtherConsumerMember