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Derivative Financial Instruments (Details) - Schedule of summarize the effect of fair value hedging relationship recognized in the consolidated statement of income - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Gain (loss) on fair value hedging relationship: |  |
Hedged asset/(liability) | $ 3,698 | $ (482)
Fair value derivative designated as hedging instrument | (3,668) | 511
Total gain recognized in interest income on loans | $ 30 | $ 29

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- Definition Fair value of all derivative designated as fair value hedging instruments. + References No definition available. + Details
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Namespace Prefix: | SFST_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Gain Loss On Fair Value Hedging Relationship [Abstract] + References No definition available. + Details
Name: | SFST_GainLossOnFairValueHedgingRelationshipAbstract
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Data Type: | xbrli:stringItemType
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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 25 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480238/815-25-50-1 + Details
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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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