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DOCUMENT AND ENTITY INFORMATION - USD ($)
 12 Months Ended
Dec. 31, 2019
Mar. 27, 2020
Jun. 30, 2019
DOCUMENT AND ENTITY INFORMATION      
Document Type 10-K    
Document Period End Date Dec. 31, 2019    
Entity Registrant Name HBT Financial, Inc.    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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 Public Float     $ 0
Entity Common Stock, Shares Outstanding   27,457,306  
Entity Central Index Key 0000775215    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false