XML 45 R34.htm IDEA: XBRL DOCUMENT
v3.25.2

Loans and Allowance for Credit Losses (Details) - Schedule of loans due after one year by category - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed total gross loans, net of deferred fees | $ 2,801,018 | $ 2,785,420
Interest Rate, Floating or Adjustable total gross loans, net of deferred fees | 583,235 | 521,441
Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed | 1,640,503 | 1,644,811
Interest Rate, Floating or Adjustable | 337,199 | 303,513
Commercial [Member] | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed | 25,916 | 63,019
Interest Rate, Floating or Adjustable | 21,700 | 33,706
Commercial [Member] | Business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed | 293,806 | 281,316
Interest Rate, Floating or Adjustable | 170,561 | 144,823
Commercial [Member] | Owner occupied RE [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed | 609,739 | 599,179
Interest Rate, Floating or Adjustable | 46,896 | 31,183
Commercial [Member] | Non-owner occupied RE [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed | 711,042 | 701,297
Interest Rate, Floating or Adjustable | 98,042 | 93,801
Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed | 1,160,515 | 1,140,609
Interest Rate, Floating or Adjustable | 246,036 | 217,928
Consumer [Member] | Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed | 9,921 | 15,025
Interest Rate, Floating or Adjustable |  |
Consumer [Member] | Real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed | 1,133,975 | 1,107,647
Interest Rate, Floating or Adjustable |  |
Consumer [Member] | Home equity [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed | 9,355 | 9,899
Interest Rate, Floating or Adjustable | 220,261 | 191,544
Consumer [Member] | Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Interest Rate, Fixed | 7,264 | 8,038
Interest Rate, Floating or Adjustable | $ 25,775 | $ 26,384

X
- Definition Amount of interest rate fixed. + References No definition available. + Details
Name: | SFST_InterestRateFixed
Namespace Prefix: | SFST_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of interest rate, fixed total gross loans, net of deferred fees. + References No definition available. + Details
Name: | SFST_InterestRateFixedTotalGrossLoansNetOfDeferredFees
Namespace Prefix: | SFST_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of interest rate, floating or adjustable. + References No definition available. + Details
Name: | SFST_InterestRateFloatingOrAdjustable
Namespace Prefix: | SFST_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of interest rate, floating or adjustable total gross loans, net of deferred fees. + References No definition available. + Details
Name: | SFST_InterestRateFloatingOrAdjustableTotalGrossLoansNetOfDeferredFees
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/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 12: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (e)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 13: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 14: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 15: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 16: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 17: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=SFST_BusinessLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_CommercialRealEstateMember
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: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=SFST_OtherConsumerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |