Cover - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2023
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 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 Common Stock, Shares Outstanding		8,088,638