Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 07, 2023	Jun. 30, 2022
Document Information Line Items
Entity Registrant Name	Southern First Bancshares, Inc.
Trading Symbol	SFST
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		8,048,025
Entity Public Float			$ 327,641,105
Amendment Flag	false
Entity Central Index Key	0001090009
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Document Annual Report	true
Document Transition Report	false
Entity File Number	000-27719
Entity Incorporation, State or Country Code	SC
Entity Tax Identification Number	58-2459561
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
Local Phone Number	679-9000
City Area Code	864
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Auditor Firm ID	149
Auditor Name	Elliott Davis, LLC
Auditor Location	Greenville, South Carolina