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DOCUMENT AND ENTITY INFORMATION - shares
 9 Months Ended
Sep. 30, 2020
Oct. 31, 2020
DOCUMENT AND ENTITY INFORMATION    
Document Type 10-Q  
Document Period End Date Sep. 30, 2020  
Entity Registrant Name HBT Financial, Inc.  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   27,457,306
Entity Central Index Key 0000775215  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Amendment Flag false