XML 53 R42.htm IDEA: XBRL DOCUMENT
v3.21.2

Loans and Allowance for Loan Losses (Schedule of Key Information for Impaired Loans) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Summary of key information for impaired loans |  |
Unpaid Principal Balance | $ 13,244 | $ 14,993
Impaired loans | 11,387 | 12,962
Impaired loans with no related allowance for loan losses | 6,828 | 7,824
Impaired loans with related allowance for loan losses | 4,560 | 5,138
Related allowance for loan losses | 1,588 | 1,709
Commercial Loan [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 6,547 | 7,998
Impaired loans | 5,308 | 6,425
Impaired loans with no related allowance for loan losses | 2,388 | 2,620
Impaired loans with related allowance for loan losses | 2,920 | 3,805
Related allowance for loan losses | 1,120 | 1,339
Commercial Loan [Member] | Owner Occupied Re [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 1,268 | 1,753
Impaired loans | 1,268 | 1,649
Impaired loans with no related allowance for loan losses | 1,268 | 1,497
Impaired loans with related allowance for loan losses |  | 152
Related allowance for loan losses |  | 76
Commercial Loan [Member] | Non Owner Occupied Re [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 3,163 | 3,212
Impaired loans | 2,013 | 2,188
Impaired loans with no related allowance for loan losses | 996 | 705
Impaired loans with related allowance for loan losses | 1,017 | 1,483
Related allowance for loan losses | 303 | 366
Commercial Loan [Member] | Business Loan [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 2,116 | 2,892
Impaired loans | 2,027 | 2,449
Impaired loans with no related allowance for loan losses | 124 | 279
Impaired loans with related allowance for loan losses | 1,903 | 2,170
Related allowance for loan losses | 817 | 897
Commercial Loan [Member] | Construction Loans [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance |  | 141
Impaired loans |  | 139
Impaired loans with no related allowance for loan losses |  | 139
Impaired loans with related allowance for loan losses |  |
Related allowance for loan losses |  |
Consumer Loan [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 6,697 | 6,995
Impaired loans | 6,079 | 6,537
Impaired loans with no related allowance for loan losses | 4,439 | 5,204
Impaired loans with related allowance for loan losses | 1,640 | 1,333
Related allowance for loan losses | 468 | 370
Consumer Loan [Member] | Other Consumer [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 129 | 135
Impaired loans | 129 | 135
Impaired loans with no related allowance for loan losses |  |
Impaired loans with related allowance for loan losses | 129 | 135
Related allowance for loan losses | 16 | 17
Consumer Loan [Member] | Construction Loans [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance |  |
Impaired loans |  |
Impaired loans with no related allowance for loan losses |  |
Impaired loans with related allowance for loan losses |  |
Related allowance for loan losses |  |
Consumer Loan [Member] | Real Estate Loan [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 4,685 | 4,362
Impaired loans | 4,282 | 4,031
Impaired loans with no related allowance for loan losses | 2,829 | 3,108
Impaired loans with related allowance for loan losses | 1,453 | 923
Related allowance for loan losses | 394 | 190
Consumer Loan [Member] | Home Equity Loan [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 1,883 | 2,498
Impaired loans | 1,668 | 2,371
Impaired loans with no related allowance for loan losses | 1,610 | 2,096
Impaired loans with related allowance for loan losses | 58 | 275
Related allowance for loan losses | $ 58 | $ 163

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

X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
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_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=sfst_BusinessLoanMember
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_FinancialInstrumentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=sfst_OtherConsumerMember
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: |