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Fair Value Accounting (Details Narrative) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Percentage of loans collateralize by real estate | 85.00%

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- Definition The percentage of loans collateral by real estate. + References No definition available. + Details
Name: | SFST_PercentageOfLoansCollateralByRealEstate
Namespace Prefix: | SFST_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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