XML 54 R42.htm IDEA: XBRL DOCUMENT
v3.20.2

Loans and Allowance for Loan Losses (Schedule of Key Information for Impaired Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Summary of key information for impaired loans |  |
Unpaid Principal Balance | $ 15,818 | $ 12,682
Impaired loans | 14,028 | 12,013
Impaired loans with no related allowance for loan losses | 8,468 | 7,344
Impaired loans with related allowance for loan losses | 5,560 | 4,669
Related allowance for loan losses | 1,802 | 1,438
Commercial Loan [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 8,492 | 8,923
Impaired loans | 7,065 | 8,308
Impaired loans with no related allowance for loan losses | 2,877 | 5,247
Impaired loans with related allowance for loan losses | 4,188 | 3,061
Related allowance for loan losses | 1,457 | 992
Commercial Loan [Member] | Owner Occupied Re [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 2,316 | 2,791
Impaired loans | 2,296 | 2,726
Impaired loans with no related allowance for loan losses | 1,843 | 2,270
Impaired loans with related allowance for loan losses | 453 | 456
Related allowance for loan losses | 92 | 75
Commercial Loan [Member] | Non Owner Occupied Re [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 3,114 | 4,512
Impaired loans | 2,143 | 4,051
Impaired loans with no related allowance for loan losses | 610 | 2,419
Impaired loans with related allowance for loan losses | 1,533 | 1,632
Related allowance for loan losses | 455 | 465
Commercial Loan [Member] | Business Loan [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 2,919 | 1,620
Impaired loans | 2,483 | 1,531
Impaired loans with no related allowance for loan losses | 281 | 558
Impaired loans with related allowance for loan losses | 2,202 | 973
Related allowance for loan losses | 910 | 452
Commercial Loan [Member] | Construction Loans [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 143 |
Impaired loans | 143 |
Impaired loans with no related allowance for loan losses | 143 |
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 | 7,326 | 3,759
Impaired loans | 6,963 | 3,705
Impaired loans with no related allowance for loan losses | 5,591 | 2,097
Impaired loans with related allowance for loan losses | 1,372 | 1,608
Related allowance for loan losses | 345 | 446
Consumer Loan [Member] | Other Consumer [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 138 | 147
Impaired loans | 138 | 147
Impaired loans with no related allowance for loan losses |  |
Impaired loans with related allowance for loan losses | 138 | 147
Related allowance for loan losses | 18 | 16
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 | 4,206 | 2,727
Impaired loans | 4,031 | 2,720
Impaired loans with no related allowance for loan losses | 3,152 | 1,638
Impaired loans with related allowance for loan losses | 879 | 1,082
Related allowance for loan losses | 75 | 364
Consumer Loan [Member] | Home Equity Loan [Member] |  |
Summary of key information for impaired loans |  |
Unpaid Principal Balance | 2,982 | 885
Impaired loans | 2,794 | 838
Impaired loans with no related allowance for loan losses | 2,439 | 459
Impaired loans with related allowance for loan losses | 355 | 379
Related allowance for loan losses | $ 252 | $ 66

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=121611835&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=121611835&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=121611835&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=121611835&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=121611835&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: |