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Mortgage Loans Held for Sale (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Mortgage Loans Held For Sale [Abstract]
Mortgage loans held for sale, fair value	$ 18.3	$ 13.6

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- References

No definition available.

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

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- Definition

Fair value portion of mortgage loans held-for-sale.

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No definition available.

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Name:	us-gaap_MortgagesHeldForSaleFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant