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Related Party Transactions (Details) - Schedule of loan transactions with directors and executive officers, including their affiliates - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Related Party Transactions [Abstract]
Balance, beginning of year	$ 25,252	$ 17,217
New loans	7,000	17,455
Less loan payments	(7,107)	(9,420)
Balance, end of year	$ 25,145	$ 25,252

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- References

No definition available.

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Name:	SFST_LoanPaymentsRelatedParty
Namespace Prefix:	SFST_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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No definition available.

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Name:	SFST_LoanTransactionsWithRelatedParty
Namespace Prefix:	SFST_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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No definition available.

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Name:	SFST_NewLoans
Namespace Prefix:	SFST_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration