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SECURITIES - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
SECURITIES
Carrying value of securities pledged to secure public and trust deposits	$ 357,608,000	$ 308,064,000
Illinois
SECURITIES
Percentage of obligations of local municipalities	48.00%
Percentage of general obligations in local municipalities	95.00%

X

- Definition

The percentage of general obligations in local municipalities.

+ References

No definition available.

+ Details

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Namespace Prefix:	hbt_
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Period Type:	duration

X

- Definition

The percentage of obligations of local municipalities in local municipalities portfolio.

+ References

No definition available.

+ Details

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Namespace Prefix:	hbt_
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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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X

- Definition

Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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