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Reportable Segments (Details Textual) | 6 Months Ended
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Jun. 30, 2018 Investments
Reportable Segments (Textual) |
Number of segments | 3

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

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration