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Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 03, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Current Fiscal Year End Date --12-31    
Entity File Number 000-27719    
Entity Registrant Name Southern First Bancshares, Inc.    
Entity Central Index Key 0001090009    
Entity Tax Identification Number 58-2459561    
Entity Incorporation, State or Country Code SC    
Entity Address, Address Line One 6 Verdae Boulevard    
Entity Address, City or Town Greenville    
Entity Address, State or Province SC    
Entity Address, Postal Zip Code 29607    
City Area Code 864    
Local Phone Number 679-9000    
Title of 12(b) Security Common Stock    
Trading Symbol SFST    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 224,378,032
Entity Common Stock, Shares Outstanding   8,177,372  
Documents Incorporated by Reference [Text Block] Portions of the registrant’s Proxy Statement relating to the Annual Meeting of Shareholders to be held on May 20, 2025 are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Auditor Firm ID 149    
Auditor Name Elliott Davis, LLC    
Auditor Location Greenville, South Carolina