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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

X
- References No definition available. + Details
Name: | SFST_LoanPaymentsRelatedParty
Namespace Prefix: | SFST_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | SFST_LoanTransactionsWithRelatedParty
Namespace Prefix: | SFST_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | SFST_NewLoans
Namespace Prefix: | SFST_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration