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Financial Instruments With Off-Balance Sheet Risk (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financial instruments with-off balance sheet risk (Textual)    
Commitment under letters of credit $ 2.6sfst_CommitmentUnderLettersOfCredit $ 3.0sfst_CommitmentUnderLettersOfCredit
Unfunded commitments to extend credit [Member]    
Financial instruments with-off balance sheet risk (Textual)    
Amount of unfunded commitments to extend credit 167.3sfst_UnfundedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 138.7sfst_UnfundedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Unfunded commitments to extend credit at fixed rate 52.2sfst_UnfundedCommitmentsToExtendCreditAtFixedRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 32.6sfst_UnfundedCommitmentsToExtendCreditAtFixedRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Unfunded commitments to extend credit at variable rate $ 115.1sfst_UnfundedCommitmentsToExtendCreditAtVariableRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 $ 106.1sfst_UnfundedCommitmentsToExtendCreditAtVariableRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember