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Fair Value Accounting (Details Textual) | 9 Months Ended
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Sep. 30, 2017
Fair Value Accounting (Textual) |
Percentage of loans collateralize by real estate, description | More than 80%

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- References No definition available. + Details
Name: | sfst_FairValueAccountingTextualAbstract
Namespace Prefix: | sfst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of company's loans collateral by real estate. + References No definition available. + Details
Name: | sfst_PercentageOfLoansCollateralByRealEstate
Namespace Prefix: | sfst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration