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Unused Lines of Credit (Details) $ in Millions	Dec. 31, 2017 USD ($) linesofcredit
Unused Lines of Credit (Textual)
Number of lines of credit | linesofcredit	4
Lines of credit to purchase federal funds	$ 72.0
Additional borrowings under FHLB	$ 261.9

X

- Definition

Additional borrowings under Federal Home Loan Bank.

+ References

No definition available.

+ Details

Name:	sfst_AdditionalBorrowingsUnderFederalHomeLoanBank
Namespace Prefix:	sfst_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Number of lines of credit.

+ References

No definition available.

+ Details

Name:	sfst_NumberOfLinesOfCredit
Namespace Prefix:	sfst_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	sfst_UnusedLinesOfCreditTextualAbstract
Namespace Prefix:	sfst_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant