LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Activity in Allowance (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 42,111	$ 40,815	$ 42,044	$ 40,048
Provision for credit losses	595	677	1,091	1,237
Charge-offs	(1,252)	(870)	(1,917)	(1,097)
Recoveries	205	184	441	618
Ending balance	41,659	40,806	41,659	40,806
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6,086	5,230	5,357	4,980
Provision for credit losses	837	0	1,892	239
Charge-offs	(659)	(493)	(1,044)	(508)
Recoveries	46	24	105	50
Ending balance	6,310	4,761	6,310	4,761
Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,300	2,157	3,107	2,272
Provision for credit losses	(20)	32	172	(85)
Charge-offs	0	0	(1)	0
Recoveries	31	2	33	4
Ending balance	3,311	2,191	3,311	2,191
Commercial real estate - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11,193	10,058	11,707	7,714
Provision for credit losses	442	(257)	(72)	1,845
Charge-offs	0	0	0	0
Recoveries	0	15	0	257
Ending balance	11,635	9,816	11,635	9,816
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,621	5,545	4,302	5,998
Provision for credit losses	(1,172)	609	(848)	155
Charge-offs	(2)	0	(8)	0
Recoveries	3	1	4	2
Ending balance	3,450	6,155	3,450	6,155
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,118	3,845	4,331	3,837
Provision for credit losses	479	55	266	63
Charge-offs	(43)	(188)	(43)	(188)
Recoveries	0	0	0	0
Ending balance	4,554	3,712	4,554	3,712
One-to-four family residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,755	4,846	3,908	5,204
Provision for credit losses	311	(75)	199	(496)
Charge-offs	(432)	(54)	(517)	(75)
Recoveries	43	68	87	152
Ending balance	3,677	4,785	3,677	4,785
Agricultural and farmland
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,316	1,014	1,170	975
Provision for credit losses	233	44	341	76
Charge-offs	(9)	0	(9)	0
Recoveries	18	1	56	8
Ending balance	1,558	1,059	1,558	1,059
Municipal, consumer, and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	7,722	8,120	8,162	9,068
Provision for credit losses	(515)	269	(859)	(560)
Charge-offs	(107)	(135)	(295)	(326)
Recoveries	64	73	156	145
Ending balance	$ 7,164	$ 8,327	$ 7,164	$ 8,327

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hbt_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hbt_CommercialRealEstateOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hbt_CommercialRealEstateNonOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hbt_ConstructionAndLandDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hbt_MultiFamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hbt_OneToFourFamilyResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hbt_AgriculturalAndFarmlandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hbt_MunicipalConsumerAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: