XML 52 R41.htm IDEA: XBRL DOCUMENT
v3.19.1

Loans and Allowance for Loan Losses (Details 8) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | $ 12,896 | $ 13,060 | $ 13,084
Recognized interest income | 175 | 158 | 733
Commercial [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 8,301 | 7,875 | 8,527
Recognized interest income | 119 | 88 | 478
Commercial [Member] | Owner occupied RE [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 2,757 | 2,231 | 2,784
Recognized interest income | 30 | 17 | 142
Commercial [Member] | Non-owner occupied RE [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 2,977 | 3,758 | 2,860
Recognized interest income | 49 | 50 | 174
Commercial [Member] | Business [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 2,567 | 1,886 | 2,883
Recognized interest income | 40 | 21 | 162
Commercial [Member] | Construction [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment |  |  |
Recognized interest income |  |  |
Consumer [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 4,595 | 5,185 | 4,557
Recognized interest income | 56 | 70 | 255
Consumer [Member] | Other [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 157 | 168 | 174
Recognized interest income | 1 | 1 | 5
Consumer [Member] | Real estate [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 2,761 | 2,814 | 2,930
Recognized interest income | 25 | 41 | 151
Consumer [Member] | Home equity [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 1,677 | 2,203 | 1,453
Recognized interest income | 30 | 28 | 99
Consumer [Member] | Construction [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment |  |  |
Recognized interest income |  |  |

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=84173941&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=84173941&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=84173941&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: |