XML 47 R36.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Loans and Allowance for Loan Losses (Details 4) - Consumer loans [Member] - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | $ 507,912 | $ 480,117
Other [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 22,449 | 22,575
Pass [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 499,401 | 472,685
Pass [Member] | Other [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 22,189 | 22,367
Special Mention [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 2,265 | 1,828
Special Mention [Member] | Other [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 197 | 88
Substandard [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 6,246 | 5,604
Substandard [Member] | Other [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 63 | 120
Doubtful [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans |  |
Doubtful [Member] | Other [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans |  |
Real estate [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 290,433 | 273,050
Real estate [Member] | Pass [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 286,006 | 269,422
Real estate [Member] | Special Mention [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 1,558 | 715
Real estate [Member] | Substandard [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 2,869 | 2,913
Real estate [Member] | Doubtful [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans |  |
Home equity [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 156,630 | 156,141
Home equity [Member] | Pass [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 152,806 | 152,545
Home equity [Member] | Special Mention [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 510 | 1,025
Home equity [Member] | Substandard [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 3,314 | 2,571
Home equity [Member] | Doubtful [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans |  |
Construction [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 38,400 | 28,351
Construction [Member] | Pass [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans | 38,400 | 28,351
Construction [Member] | Special Mention [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans |  |
Construction [Member] | Substandard [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans |  |
Construction [Member] | Doubtful [Member] |  |
Outstanding commercial and consumer loans by risk category |  |
Outstanding consumer loans |  |

X
- References No definition available. + Details
Name: | sfst_OutstandingLoansByRiskCategoryAbstract
Namespace Prefix: | sfst_
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=82891408&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=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_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: |

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: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |