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Junior Subordinated Debentures (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2014
Jun. 30, 2003
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2005
Junior Subordinated Debentures (Textual)            
Junior subordinated debentures $ 13,403,000us-gaap_JuniorSubordinatedNotes   $ 13,403,000us-gaap_JuniorSubordinatedNotes      
Description Of Wall Street Reform and Consumer Protection Act Dodd-Frank Wall Street Reform and Consumer Protection Act will prohibit institutions that had more than $15 billion in assets on December 31, 2009 from including trust preferred securities as Tier 1 capital beginning in 2013. One-third will be phased out over the next two years ending in 2015. Financial institutions with less than $15 billion in total assets, such as the Bank, may continue to include their trust preferred securities issued prior to May 19, 2010 in Tier 1 capital, but cannot include in Tier 1 capital trust preferred securities issued after such date.          
Greenville First Statutory Trust I [Member]            
Junior Subordinated Debentures (Textual)            
Trust preferred securities issued at floating rate   6,000,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustOneMember
       
Maturity date of trust preferred securities   Jun. 26, 2033        
Floating interest rate of trust preferred securities 3.35%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustOneMember
         
Indexed period of LIBOR rate 3-month          
Initial proceeds of preferred securities from the capital investment 186,000sfst_InitialProceedsOfPreferredSecuritiesFromCapitalInvestment
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustOneMember
         
Junior subordinated debentures 6,200,000us-gaap_JuniorSubordinatedNotes
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustOneMember
         
Amortization of debt issuance costs 0sfst_AmortizationOfDebtIssuanceCosts
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustOneMember
  9,000sfst_AmortizationOfDebtIssuanceCosts
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustOneMember
18,000sfst_AmortizationOfDebtIssuanceCosts
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustOneMember
18,000sfst_AmortizationOfDebtIssuanceCosts
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustOneMember
 
Greenville First Statutory Trust II [Member]            
Junior Subordinated Debentures (Textual)            
Trust preferred securities issued at floating rate           7,000,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustTwoMember
Maturity date of trust preferred securities           Dec. 22, 2035
Floating interest rate of trust preferred securities 1.70%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustTwoMember
         
Indexed period of LIBOR rate 3-month          
Initial proceeds of preferred securities from the capital investment 217,000sfst_InitialProceedsOfPreferredSecuritiesFromCapitalInvestment
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustTwoMember
         
Junior subordinated debentures $ 7,200,000us-gaap_JuniorSubordinatedNotes
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfst_GreenvilleFirstStatutoryTrustTwoMember