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Derivative Financial Instruments (Details) - Schedule of summarize the effect of fair value hedging relationship recognized in the consolidated statement of income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Gain (loss) on fair value hedging relationship:
Hedged asset/(liability)	$ 1,769	$ (741)	$ 5,210	$ (4,479)
Fair value derivative designated as hedging instrument	(1,714)	780	(5,155)	4,468
Total gain (loss) recognized in interest income on loans	$ 55	$ 39	$ 55	$ (11)

X

- Definition

Fair value of all derivative designated as fair value hedging instruments.

+ References

No definition available.

+ Details

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X

- Definition

Gain Loss On Fair Value Hedging Relationship [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	SFST_
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- Definition

Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Definition

Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 182
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-182

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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