XML 50 R38.htm IDEA: XBRL DOCUMENT
v3.20.2

Loans and Allowance for Loan Losses (Schedule of Breakdown of Outstanding Loans by Risk Category) (Details) - Commercial Loan [Member] - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | $ 1,357,278 | $ 1,298,338
Pass [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 1,337,894 | 1,279,168
Special Mention [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 9,033 | 5,164
Substandard [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 10,351 | 14,006
Doubtful [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans |  |
Owner Occupied Re [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 419,316 | 407,851
Owner Occupied Re [Member] | Pass [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 415,899 | 404,237
Owner Occupied Re [Member] | Special Mention [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 359 | 1,312
Owner Occupied Re [Member] | Substandard [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 3,058 | 2,302
Owner Occupied Re [Member] | Doubtful [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans |  |
Non Owner Occupied Re [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 570,139 | 501,878
Non Owner Occupied Re [Member] | Pass [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 560,896 | 492,941
Non Owner Occupied Re [Member] | Special Mention [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 6,078 | 744
Non Owner Occupied Re [Member] | Substandard [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 3,165 | 8,193
Non Owner Occupied Re [Member] | Doubtful [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans |  |
Construction Loans [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 64,063 | 80,486
Construction Loans [Member] | Pass [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 63,920 | 80,486
Construction Loans [Member] | Special Mention [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans |  |
Construction Loans [Member] | Substandard [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 143 |
Construction Loans [Member] | Doubtful [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans |  |
Business Loan [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 303,760 | 308,123
Business Loan [Member] | Pass [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 297,179 | 301,504
Business Loan [Member] | Special Mention [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 2,596 | 3,108
Business Loan [Member] | Substandard [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans | 3,985 | 3,511
Business Loan [Member] | Doubtful [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding commercial loans |  |

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

X
- Definition Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableBeforeFeesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=sfst_NonOwnerOccupiedReMember
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: |