XML 103 R73.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Troubled Debt Restructurings (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) Investments | Dec. 31, 2018 USD ($) Investments
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification |  |
Renewals deemed a concession | 1 | 7
Reduced or deferred payments | 1 | 1
Converted to interest only |  |
Maturity date extensions |  |
Total number of loans | 1 | 8
Pre-modification outstanding recorded investment | $ | $ 1,823 | $ 3,549
Post-modification outstanding recorded investment | $ | $ 1,823 | $ 4,080
Commercial [Member] | Non-owner occupied RE [Member] |  |
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification |  |
Renewals deemed a concession |  |
Reduced or deferred payments |  | 1
Converted to interest only |  |
Maturity date extensions |  |
Total number of loans |  | 1
Pre-modification outstanding recorded investment | $ |  | $ 1,287
Post-modification outstanding recorded investment | $ |  | $ 1,287
Commercial [Member] | Owner occupied RE [Member] |  |
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification |  |
Renewals deemed a concession |  | 1
Reduced or deferred payments |  |
Converted to interest only |  |
Maturity date extensions |  |
Total number of loans |  | 1
Pre-modification outstanding recorded investment | $ |  | $ 506
Post-modification outstanding recorded investment | $ |  | $ 592
Commercial [Member] | Business [Member] |  |
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification |  |
Renewals deemed a concession | 1 | 4
Reduced or deferred payments | 1 |
Converted to interest only |  |
Maturity date extensions |  |
Total number of loans | 1 | 4
Pre-modification outstanding recorded investment | $ | $ 1,823 | $ 1,207
Post-modification outstanding recorded investment | $ | $ 1,823 | $ 1,532
Consumer [Member] | Real estate [Member] |  |
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification |  |
Renewals deemed a concession |  | 2
Reduced or deferred payments |  |
Converted to interest only |  |
Maturity date extensions |  |
Total number of loans |  | 2
Pre-modification outstanding recorded investment | $ |  | $ 549
Post-modification outstanding recorded investment | $ |  | $ 669

X
- Definition Converted to interest only. + References No definition available. + Details
Name: | sfst_ConvertedToInterestOnly
Namespace Prefix: | sfst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maturity date extensions. + References No definition available. + Details
Name: | sfst_MaturityDateExtensions
Namespace Prefix: | sfst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reduced or deferred payments. + References No definition available. + Details
Name: | sfst_ReducedOrDeferredPayments
Namespace Prefix: | sfst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Renewals deemed concession. + References No definition available. + Details
Name: | sfst_RenewalsDeemedConcession
Namespace Prefix: | sfst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_NonOwnerOccupiedReMember
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_BusinessLoanMember
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |