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FAIR VALUE OF FINANCIAL INSTRUMENTS - Unobservable inputs used in nonrecurring measurements (Details) - Nonrecurring - Level 3 $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Collateral-dependent impaired loans
FAIR VALUE OF FINANCIAL INSTRUMENTS
Alternative Investment, Measurement Input [Extensible List]	hbt:AppraisalAdjustmentsMember	hbt:AppraisalAdjustmentsMember
Collateral-dependent impaired loans | Appraisal of collateral
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair Value	$ 33,320	$ 15,811
Bank premises held for sale
FAIR VALUE OF FINANCIAL INSTRUMENTS
Alternative Investment, Measurement Input [Extensible List]	hbt:AppraisalAdjustmentsMember	hbt:AppraisalAdjustmentsMember
Bank premises held for sale | Appraisal
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair Value	$ 121	$ 121
Measurement input	0.07	0.07
Bank premises held for sale | Appraisal | Weighted average
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.07	0.07
Foreclosed assets
FAIR VALUE OF FINANCIAL INSTRUMENTS
Alternative Investment, Measurement Input [Extensible List]	hbt:AppraisalAdjustmentsMember	hbt:AppraisalAdjustmentsMember
Foreclosed assets | Appraisal
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair Value	$ 4,168	$ 5,099
Measurement input	0.07	0.07
Foreclosed assets | Appraisal | Weighted average
FAIR VALUE OF FINANCIAL INSTRUMENTS
Measurement input	0.07	0.07

X

- Definition

Value of input used to measure assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	hbt_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Indicates measurement input for alternative investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14210-108612

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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