XML 44 R34.htm IDEA: XBRL DOCUMENT
v3.23.3

Loans and Allowance for Credit Losses (Details) - Schedule of nonaccrual loans by major categories - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | $ 2,194,669 | $ 2,053,318
Total consumer | 1,358,963 | 1,220,045
Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total nonaccrual loans | 957 | 308
Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total nonaccrual loans | 3,358 | 2,319
Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total nonaccrual loans | 4,315 | 2,627
Owner Occupied RE [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 637,038 | 612,901
Non-owner occupied RE [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 937,749 | 862,579
Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 119,629 | 109,726
Total consumer | 54,210 | 80,415
Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 500,253 | 468,112
Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 1,074,679 | 931,278
Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 180,856 | 179,300
Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 49,218 | 29,052
Commercial [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 549 | 114
Commercial [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 1,470 | 315
Commercial [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 2,019 | 429
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] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 379 | 114
Commercial [Member] | Non-owner occupied RE [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 1,236 | 133
Commercial [Member] | Non-owner occupied RE [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 1,615 | 247
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] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 170 |
Commercial [Member] | Business [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 234 | 182
Commercial [Member] | Business [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total commercial | 404 | 182
Consumer [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 408 | 194
Consumer [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 1,888 | 2,004
Consumer [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 2,296 | 2,198
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] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 227 |
Consumer [Member] | Real Estate [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 1,001 | 1,099
Consumer [Member] | Real Estate [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 1,228 | 1,099
Consumer [Member] | Home Equity [Member] | Nonaccrual Loans With No Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 181 | 194
Consumer [Member] | Home Equity [Member] | Nonaccrual Loans With An Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 887 | 905
Consumer [Member] | Home Equity [Member] | Total Nonaccrual Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total consumer | 1,068 | 1,099
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 No definition available. + 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: | 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: | 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: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialLoanMember
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: |