XML 59 R48.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Fair Value Accounting (Details 2) | 3 Months Ended
--- | ---
Mar. 31, 2017
Impaired loans [Member] |
Schedule of unobservable inputs used in the fair value measurements |
Valuation Technique | Appraised Value/ Discounted Cash Flows
Significant Unobservable Inputs | Discounts to appraisals or cash flows for estimated holding and/or selling costs or age of appraisal
Impaired loans [Member] | Minimum [Member] |
Schedule of unobservable inputs used in the fair value measurements |
Range of Inputs | 0.00%
Impaired loans [Member] | Maximum [Member] |
Schedule of unobservable inputs used in the fair value measurements |
Range of Inputs | 25.00%
Other real estate owned [Member] |
Schedule of unobservable inputs used in the fair value measurements |
Valuation Technique | Appraised Value/ Comparable Sales
Significant Unobservable Inputs | Discounts to appraisals for estimated holding or selling costs
Other real estate owned [Member] | Minimum [Member] |
Schedule of unobservable inputs used in the fair value measurements |
Range of Inputs | 0.00%
Other real estate owned [Member] | Maximum [Member] |
Schedule of unobservable inputs used in the fair value measurements |
Range of Inputs | 25.00%

X
- Definition Fair value assumptions range of inputs. + References No definition available. + Details
Name: | sfst_FairValueAssumptionsRangeOfInputs
Namespace Prefix: | sfst_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Description of significant assumptions used by management to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
Name: | us-gaap_FairValueMeasurementsSignificantAssumptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementsValuationTechniques
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=sfst_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=sfst_OtherRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |