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Federal Home Loan Bank Advances and Other Borrowings (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Summary of terms and maturities of structured debt agreements    
Amount $ 19,200us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 19,200us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Rate 3.26%sfst_SecuritiesSoldUnderAgreementsToRepurchaseRate  
Structured debt agreements [Member]    
Summary of terms and maturities of structured debt agreements    
Maturity Sep. 18, 2017  
Amount 10,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= sfst_StructuredDebtAgreementsMember
 
Rate 3.63%sfst_SecuritiesSoldUnderAgreementsToRepurchaseRate
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= sfst_StructuredDebtAgreementsMember
 
Structured debt agreements one [Member]    
Summary of terms and maturities of structured debt agreements    
Maturity Dec. 17, 2017  
Amount 2,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= sfst_StructuredDebtAgreementsOneMember
 
Rate 3.65%sfst_SecuritiesSoldUnderAgreementsToRepurchaseRate
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= sfst_StructuredDebtAgreementsOneMember
 
Structured debt agreements two [Member]    
Summary of terms and maturities of structured debt agreements    
Maturity Mar. 14, 2018  
Amount 3,600us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= sfst_StructuredDebtAgreementsTwoMember
 
Rate 2.75%sfst_SecuritiesSoldUnderAgreementsToRepurchaseRate
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= sfst_StructuredDebtAgreementsTwoMember
 
Structured debt agreements three [Member]    
Summary of terms and maturities of structured debt agreements    
Maturity Sep. 15, 2018  
Amount $ 3,600us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= sfst_StructuredDebtAgreementsThreeMember
 
Rate 2.55%sfst_SecuritiesSoldUnderAgreementsToRepurchaseRate
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= sfst_StructuredDebtAgreementsThreeMember