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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
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Dec. 31, 2022 | Dec. 31, 2021
Schedule of Summary of Loan Transactions with Directors and Executive Officers Including their Affiliates [Abstract] |  |
Balance, beginning of year | $ 8,790 | $ 5,790
New loans | 21,010 | 11,629
Less loan payments | (12,583) | (8,629)
Balance, end of year | $ 17,217 | $ 8,790

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- Definition Loan payment by a related party. + References No definition available. + Details
Name: | sfst_LoanPaymentsRelatedParty
Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Loan transactions with related party. + References No definition available. + Details
Name: | sfst_LoanTransactionsWithRelatedParty
Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition New loans. + References No definition available. + Details
Name: | sfst_NewLoans
Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | sfst_ScheduleOfLoanTransactionsWithDirectorsAndExecutiveOfficersIncludingTheirAffiliatesAbstract
Namespace Prefix: | sfst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration