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DOCUMENT AND ENTITY INFORMATION - shares
 3 Months Ended
Mar. 31, 2022
Apr. 27, 2022
DOCUMENT AND ENTITY INFORMATION    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 31, 2022  
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   28,920,011
Entity Central Index Key 0000775215  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q1  
Amendment Flag false