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Fair Value Accounting (Details) - Schedule of assets and liabilities measured at fair value on nonrecurring basis - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Assets |  |
Impaired loans | $ 6,954 | $ 7,327
Total assets measured at fair value on a nonrecurring basis | 6,954 | 7,327
Level 1 [Member] |  |
Assets |  |
Impaired loans |  |
Total assets measured at fair value on a nonrecurring basis |  |
Level 2 [Member] |  |
Assets |  |
Impaired loans | 4,970 | 5,262
Total assets measured at fair value on a nonrecurring basis | 4,970 | 5,262
Level 3 [Member] |  |
Assets |  |
Impaired loans | 1,984 | 2,065
Total assets measured at fair value on a nonrecurring basis | $ 1,984 | $ 2,065

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- References No definition available. + Details
Name: | sfst_AssetsAbstract000
Namespace Prefix: | sfst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | sfst_AssetsFairValueDisclosuresNonRecurring
Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of fair value on a nonrecurring basis impaired loans. + References No definition available. + Details
Name: | sfst_FairValueOnANonrecurringBasisImpairedLoans
Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
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: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |