Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Nov. 06, 2020
Cover [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2020
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-37661
Entity Registrant Name	SMARTFINANCIAL INC.
Entity Incorporation, State or Country Code	TN
Entity Tax Identification Number	62-1173944
Entity Address, Address Line One	5401 Kingston Pike, Suite 600
Entity Address, City or Town	Knoxville
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37919
City Area Code	865
Local Phone Number	437-5700
Title of 12(b) Security	Common Stock, par value $1.00
Trading Symbol	SMBK
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		15,235,227
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001038773
Current Fiscal Year End Date	--12-31