XML 125 R112.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Reportable Segments (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2017 Segments
Reportable Segments (Textual) |
Number of segments | 3

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

X
- 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