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DOCUMENT AND ENTITY INFORMATION - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 23, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
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 309    
Local Phone Number 662-4444    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol HBT    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 240.1
Entity Common Stock, Shares Outstanding   31,643,206  
Documents Incorporated by Reference
Items 10, 11, 12, 13 and 14 of Part III incorporate information by reference from the definitive Proxy Statement for the 2024 Annual Meeting of Stockholders of HBT Financial, Inc. to be filed within 120 days of December 31, 2023.
    
Amendment Flag false    
Entity Central Index Key 0000775215    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023