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FAIR VALUE OF FINANCIAL INSTRUMENTS - Unobservable inputs used in nonrecurring measurements (Details) - Nonrecurring - Level 3 $ in Thousands | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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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 | $ 30,579 | $ 33,320
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 | 7 | 7
Bank premises held for sale | Appraisal | Weighted average |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Measurement input | 7 | 7
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 | $ 4,748 | $ 4,168
Measurement input | 7 | 7
Foreclosed assets | Appraisal | Weighted average |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Measurement input | 7 | 7

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- 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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- 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 + Details
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- 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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