XML 76 R63.htm IDEA: XBRL DOCUMENT
v3.20.4

Loans and Allowance for Loan Losses (Details 3) - Commercial Loans [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | $ 1,387,655 | $ 1,298,338
Owner occupied RE [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 433,320 | 407,851
Non-owner occupied RE [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 585,269 | 501,878
Construction [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 61,467 | 80,486
Business [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 307,599 | 308,123
Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 1,369,552 | 1,279,168
Pass [Member] | Owner occupied RE [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 430,291 | 404,237
Pass [Member] | Non-owner occupied RE [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 576,095 | 492,941
Pass [Member] | Construction [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 61,328 | 80,486
Pass [Member] | Business [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 301,838 | 301,504
Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 2,914 | 5,164
Special Mention [Member] | Owner occupied RE [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 624 | 1,312
Special Mention [Member] | Non-owner occupied RE [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 587 | 744
Special Mention [Member] | Construction [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans |  |
Special Mention [Member] | Business [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 1,703 | 3,108
Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 15,189 | 14,006
Substandard [Member] | Owner occupied RE [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 2,405 | 2,302
Substandard [Member] | Non-owner occupied RE [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 8,587 | 8,193
Substandard [Member] | Construction [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 139 |
Substandard [Member] | Business [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans | 4,058 | 3,511
Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans |  |
Doubtful [Member] | Owner occupied RE [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans |  |
Doubtful [Member] | Non-owner occupied RE [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans |  |
Doubtful [Member] | Construction [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans |  |
Doubtful [Member] | Business [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Outstanding commercial loans |  |

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_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
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=sfst_CommercialLoansMember
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: |

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: |