XML 88 R75.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Property and Equipment (Details 1) | 12 Months Ended
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Dec. 31, 2018
Software [Member] |
Schedule of estimated useful lives of property plant and equipment |
Property and equipment, estimated useful life (in years) | 3 years
Furniture and equipment [Member] | Minimum [Member] |
Schedule of estimated useful lives of property plant and equipment |
Property and equipment, estimated useful life (in years) | 5 years
Furniture and equipment [Member] | Maximum [Member] |
Schedule of estimated useful lives of property plant and equipment |
Property and equipment, estimated useful life (in years) | 7 years
Leasehold improvements [Member] | Minimum [Member] |
Schedule of estimated useful lives of property plant and equipment |
Property and equipment, estimated useful life (in years) | 5 years
Leasehold improvements [Member] | Maximum [Member] |
Schedule of estimated useful lives of property plant and equipment |
Property and equipment, estimated useful life (in years) | 15 years
Buildings [Member] |
Schedule of estimated useful lives of property plant and equipment |
Property and equipment, estimated useful life (in years) | 40 years

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

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |