XML 54 R43.htm IDEA: XBRL DOCUMENT
v3.21.2

Loans and Allowance for Loan Losses (Average Recorded Investment and Interest Income Recognized on Impaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment | $ 11,785 | $ 16,815 | $ 12,177 | $ 16,855 | $ 14,643
Recognized interest income | 147 | 93 | 321 | 241 | 812
Commercial Loan [Member] |  |  |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment | 5,638 | 11,334 | 5,900 | 11,366 | 9,002
Recognized interest income | 68 | 72 | 182 | 182 | 558
Commercial Loan [Member] | Owner Occupied Re [Member] |  |  |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment | 1,379 | 2,722 | 1,469 | 2,723 | 2,423
Recognized interest income | 16 | 14 | 32 | 33 | 88
Commercial Loan [Member] | Non Owner Occupied Re [Member] |  |  |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment | 2,073 | 6,078 | 2,111 | 6,098 | 4,217
Recognized interest income | 32 | 39 | 94 | 102 | 221
Commercial Loan [Member] | Business Loan [Member] |  |  |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment | 2,118 | 2,534 | 2,229 | 2,545 | 2,306
Recognized interest income | 20 | 19 | 54 | 47 | 243
Commercial Loan [Member] | Construction Loans [Member] |  |  |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment | 68 |  | 91 |  | 56
Recognized interest income |  |  | 2 |  | 6
Consumer Loan [Member] |  |  |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment | 6,147 | 5,481 | 6,277 | 5,489 | 5,641
Recognized interest income | 79 | 21 | 139 | 59 | 254
Consumer Loan [Member] | Other Consumer [Member] |  |  |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment | 131 | 142 | 132 | 144 | 141
Recognized interest income | 1 | 1 | 2 | 2 | 79
Consumer Loan [Member] | Construction Loans [Member] |  |  |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment |  |  |  |  |
Recognized interest income |  |  |  |  |
Consumer Loan [Member] | Real Estate Loan [Member] |  |  |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment | 4,337 | 3,052 | 4,235 | 3,057 | 3,372
Recognized interest income | 60 | 15 | 103 | 40 | 170
Consumer Loan [Member] | Home Equity Loan [Member] |  |  |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |  |  |
Average recorded investment | 1,679 | 2,287 | 1,910 | 2,288 | 2,128
Recognized interest income | $ 18 | $ 5 | $ 34 | $ 17 | $ 5

X
- Definition Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_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: |