LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Activity in Allowance (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 40,815	$ 38,776	$ 40,048	$ 25,333
PCD allowance established in acquisition				1,247
Provision for credit losses	677	(1,080)	1,237	4,021
Charge-offs	(870)	(179)	(1,097)	(321)
Recoveries	184	297	618	551
Ending balance	40,806	37,814	40,806	37,814
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5,230	2,932	4,980	3,279
PCD allowance established in acquisition				69
Provision for credit losses	0	791	239	1,178
Charge-offs	(493)	0	(508)	0
Recoveries	24	12	50	31
Ending balance	4,761	3,735	4,761	3,735
Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,157	2,535	2,272	1,193
PCD allowance established in acquisition				127
Provision for credit losses	32	(175)	(85)	444
Charge-offs	0	0	0	(3)
Recoveries	2	2	4	14
Ending balance	2,191	2,362	2,191	2,362
Commercial real estate - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	10,058	7,840	7,714	6,721
PCD allowance established in acquisition				239
Provision for credit losses	(257)	(466)	1,845	(161)
Charge-offs	0	0	0	0
Recoveries	15	164	257	238
Ending balance	9,816	7,538	9,816	7,538
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5,545	7,574	5,998	4,223
PCD allowance established in acquisition				240
Provision for credit losses	609	(1,745)	155	(606)
Charge-offs	0	0	0	0
Recoveries	1	5	2	8
Ending balance	6,155	5,834	6,155	5,834
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,845	2,151	3,837	1,472
PCD allowance established in acquisition				68
Provision for credit losses	55	452	63	978
Charge-offs	(188)	0	(188)	0
Recoveries	0	0	0	0
Ending balance	3,712	2,603	3,712	2,603
One-to-four family residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,846	4,165	5,204	1,759
PCD allowance established in acquisition				492
Provision for credit losses	(75)	(121)	(496)	960
Charge-offs	(54)	(4)	(75)	(26)
Recoveries	68	37	152	95
Ending balance	4,785	4,077	4,785	4,077
Agricultural and farmland
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,014	2,674	975	796
PCD allowance established in acquisition				5
Provision for credit losses	44	(68)	76	237
Charge-offs	0	0	0	0
Recoveries	1	1	8	2
Ending balance	1,059	2,607	1,059	2,607
Municipal, consumer, and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8,120	8,905	9,068	5,890
PCD allowance established in acquisition				7
Provision for credit losses	269	252	(560)	991
Charge-offs	(135)	(175)	(326)	(292)
Recoveries	73	76	145	163
Ending balance	$ 8,327	$ 9,058	8,327	$ 9,058
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			6,983
Cumulative Effect, Period of Adoption, Adjustment \| Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			(822)
Cumulative Effect, Period of Adoption, Adjustment \| Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			587
Cumulative Effect, Period of Adoption, Adjustment \| Commercial real estate - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			501
Cumulative Effect, Period of Adoption, Adjustment \| Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			1,969
Cumulative Effect, Period of Adoption, Adjustment \| Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			85
Cumulative Effect, Period of Adoption, Adjustment \| One-to-four family residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			797
Cumulative Effect, Period of Adoption, Adjustment \| Agricultural and farmland
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			1,567
Cumulative Effect, Period of Adoption, Adjustment \| Municipal, consumer, and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			$ 2,299

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 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 2: 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

+ 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

+ Details

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

- Definition

Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. 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 19
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestPurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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:

- Details

Name:	srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: