XML 48 R37.htm IDEA: XBRL DOCUMENT
v3.21.2

Loans and Allowance for Loan Losses (Schedule of Outstanding Commercial and Consumer Loans as Non-Accruals by Class) (Details) - Commercial Loan [Member] - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | $ 1,420,943 | $ 1,387,655
Current [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 1,420,376 | 1,386,004
30-59 days past due [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 35 | 720
60-89 days past due [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans |  | 266
Greater than 90 days [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 532 | 665
Owner Occupied Re [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 452,130 | 433,320
Owner Occupied Re [Member] | Current [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 452,130 | 432,711
Owner Occupied Re [Member] | 30-59 days past due [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans |  | 403
Owner Occupied Re [Member] | 60-89 days past due [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans |  |
Owner Occupied Re [Member] | Greater than 90 days [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans |  | 206
Non Owner Occupied Re [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 600,094 | 585,269
Non Owner Occupied Re [Member] | Current [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 599,598 | 584,565
Non Owner Occupied Re [Member] | 30-59 days past due [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans |  | 282
Non Owner Occupied Re [Member] | 60-89 days past due [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans |  |
Non Owner Occupied Re [Member] | Greater than 90 days [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 496 | 422
Construction Loans [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 60,786 | 61,467
Construction Loans [Member] | Current [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 60,786 | 61,467
Construction Loans [Member] | 30-59 days past due [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans |  |
Construction Loans [Member] | 60-89 days past due [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans |  |
Construction Loans [Member] | Greater than 90 days [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans |  |
Business Loan [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 307,933 | 307,599
Business Loan [Member] | Current [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 307,862 | 307,261
Business Loan [Member] | 30-59 days past due [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | 35 | 35
Business Loan [Member] | 60-89 days past due [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans |  | 266
Business Loan [Member] | Greater than 90 days [Member] |  |
Outstanding commercial and consumer loans which include loans on nonaccrual status |  |
Total commercial loans | $ 36 | $ 37

X
- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph (a) + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_NotesReceivableNetAbstract
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_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=sfst_OwnerOccupiedReMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=sfst_NonOwnerOccupiedReMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=sfst_BusinessLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |