XML 50 R37.htm IDEA: XBRL DOCUMENT
v3.24.2

Loans and Allowance for Credit Losses (Details) - Schedule of nonaccrual loans by major categories - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total nonaccrual loans | $ 7,091 | $ 1,160
Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total nonaccrual loans | 4,127 | 2,803
Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total nonaccrual loans | 11,218 | 3,963
Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 2,231,027 | 2,225,027
Commercial [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 5,454 | 817
Commercial [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 3,324 | 925
Commercial [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 8,778 | 1,742
Commercial [Member] | Owner occupied RE [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 642,008 | 631,657
Commercial [Member] | Owner occupied RE [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial |  |
Commercial [Member] | Owner occupied RE [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial |  |
Commercial [Member] | Owner occupied RE [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial |  |
Commercial [Member] | Non-owner occupied RE [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 917,034 | 942,529
Commercial [Member] | Non-owner occupied RE [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 5,454 | 653
Commercial [Member] | Non-owner occupied RE [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 2,495 | 770
Commercial [Member] | Non-owner occupied RE [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 7,949 | 1,423
Commercial [Member] | Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 144,968 | 150,680
Commercial [Member] | Construction [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial |  |
Commercial [Member] | Construction [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial |  |
Commercial [Member] | Construction [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial |  |
Commercial [Member] | Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 527,017 | 500,161
Commercial [Member] | Business [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial |  | 164
Commercial [Member] | Business [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 829 | 155
Commercial [Member] | Business [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 829 | 319
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 1,391,494 | 1,377,600
Consumer [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 1,637 | 343
Consumer [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 803 | 1,878
Consumer [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 2,440 | 2,221
Consumer [Member] | Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 32,936 | 63,348
Consumer [Member] | Construction [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer |  |
Consumer [Member] | Construction [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer |  |
Consumer [Member] | Construction [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer |  |
Consumer [Member] | Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 1,126,155 | 1,082,429
Consumer [Member] | Real Estate [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 1,148 |
Consumer [Member] | Real Estate [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 728 | 985
Consumer [Member] | Real Estate [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 1,876 | 985
Consumer [Member] | Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 189,294 | 183,004
Consumer [Member] | Home Equity [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 489 | 343
Consumer [Member] | Home Equity [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 75 | 893
Consumer [Member] | Home Equity [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 564 | 1,236
Consumer [Member] | Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 43,109 | 48,819
Consumer [Member] | Other [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer |  |
Consumer [Member] | Other [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer |  |
Consumer [Member] | Other [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer |  |

X
- Definition Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
Name: | SFST_TotalCommercial
Namespace Prefix: | SFST_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
Name: | SFST_TotalConsumer
Namespace Prefix: | SFST_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of total nonaccrual loans. + References No definition available. + Details
Name: | SFST_TotalNonaccrualLoans
Namespace Prefix: | SFST_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=SFST_NonaccrualLoansWithNoAllowanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=SFST_NonaccrualLoansWithAnAllowanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=SFST_TotalNonaccrualLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=SFST_OwnerOccupiedReMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=SFST_NonOwnerOccupiedReMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=SFST_BusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=SFST_HomeEquitysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=SFST_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |