DOCUMENT AND ENTITY INFORMATION - shares	9 Months Ended
	Sep. 30, 2023	Oct. 24, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-39085
Entity Registrant Name	HBT Financial, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	37-1117216
Entity Address, Address Line One	401 North Hershey Rd
Entity Address, City or Town	Bloomington
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	61704
City Area Code	888
Local Phone Number	897-2276
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	HBT
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	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		31,710,005
Entity Central Index Key	0000775215
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false