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Fair Value Accounting (Details 1) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Impaired loans | $ 8,815 | $ 8,513
Other real estate owned | 420 | 639
Total assets measured at fair value on a nonrecurring basis | 9,235 | 9,152
Level 1 [Member] |  |
Assets |  |
Impaired loans |  |
Other real estate owned |  |
Total assets measured at fair value on a nonrecurring basis |  |
Level 2 [Member] |  |
Assets |  |
Impaired loans | 2,669 | 4,075
Other real estate owned | 307 | 526
Total assets measured at fair value on a nonrecurring basis | 2,976 | 4,601
Level 3 [Member] |  |
Assets |  |
Impaired loans | 6,146 | 4,438
Other real estate owned | 113 | 113
Total assets measured at fair value on a nonrecurring basis | $ 6,259 | $ 4,551

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- Definition Impaired loans, Fair value. + References No definition available. + Details
Name: | sfst_ImpairedLoansFairValue
Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other real estate owned. + References No definition available. + Details
Name: | sfst_OtherRealEstateOwned
Namespace Prefix: | sfst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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