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Commitments and Contingencies (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) Investments
Commitments and Contingencies (Textual) |
Description of employment agreement | 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.
Estimated aggregate salary commitment | $ 3,500
Agreement with data processor expire date | 2023
Contract price | $ 30,300
Construction amount paid | 21,800
Aggregate commitment amount | $ 2,250
President [Member] |
Commitments and Contingencies (Textual) |
Period of employment agreement | 2 years
Vice President [Member] |
Commitments and Contingencies (Textual) |
Number of executive officers | Investments | 13
Chief Executive Officer [Member] |
Commitments and Contingencies (Textual) |
Period of employment agreement | 3 years

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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 Agreement with data processor expired. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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 Construction amount paid. + 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 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 Estimated aggregate commitment. + 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 Number of executive officers. + References No definition available. + Details
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Namespace Prefix: | sfst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of Employment agreement. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of right to consideration in exchange for good or service transferred to customer under long-term contract or program when right to consideration is unconditional, including amount withheld under retainage provision in contract. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123353855&loc=SL119991595-234733 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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