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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 25, 2022
Jun. 30, 2021
Cover [Abstract]      
Entity Central Index Key 0001090009    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Type 10-K    
Document Period End Date Dec. 31, 2021    
Document Annual Report true    
Document Transition Report false    
Entity File Number 000-27719    
Entity Registrant Name Southern First Bancshares, Inc.    
Entity Incorporation State Country Code SC    
Entity Tax Identification Number 58-2459561    
Entity Address, Address Line One 100 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    
Security 12b Title Common Stock    
Trading Symbol SFST    
Name of Exchange on which Security is Registered 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 true    
Entity Emerging Growth Company false    
Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 380,614,294
Entity Common Stock, Shares Outstanding   7,976,994  
Documents Incorporated By Reference Text Block

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s Proxy Statement relating to the Annual Meeting of Shareholders to be held on May 17, 2022 are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.

   
Auditor Name Elliott Davis, LLC    
Auditor Location Greenville, South Carolina    
Auditor Firm Id 149