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Stock-Based Compensation (Details) - Schedule of stock-based compensation expense - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Stock option expense	$ 528	$ 927	$ 1,148
Restricted stock grant expense	1,415	1,099	499
Total stock-based compensation expense	$ 1,943	$ 2,026	$ 1,647

X

- References

No definition available.

+ Details

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Namespace Prefix:	SFST_
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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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- Definition

Amount of expense for employee benefit and equity-based compensation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of noncash expense for option under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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