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Commitments and Contingencies (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Commitments and Contingencies (Details) [Line Items] |
Period of Employment agreement | 2 years
Employment agreement description | These agreements also include a) an incentive program, b) a stock option plan, c) a one-year non-compete agreement upon termination and a severance payment equal to one year of compensation.
Aggregate commitment amount | $ 3.7
Total commitments | $ 1.7
Chief Executive Officer [Member] |
Commitments and Contingencies (Details) [Line Items] |
Period of Employment agreement | 3 years
Vice President [Member] |
Commitments and Contingencies (Details) [Line Items] |
Number of executive officers | 14

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- Definition Aggregate commitment amount. + References No definition available. + Details
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Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The Amount of commitments totaled approximately + References No definition available. + Details
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Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Employment agreement description. + References No definition available. + Details
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Namespace Prefix: | sfst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of executive officers. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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- Definition Period of Employment agreement. + References No definition available. + Details
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Namespace Prefix: | sfst_
Data Type: | xbrli:durationItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_VicePresidentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |