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DEPOSITS - Interest bearing Deposits - Narrative (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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DEPOSITS |  |
Reciprocal transaction deposits, Money market deposits | $ 6,853 | $ 6,489
Reciprocal transaction deposits, Time deposits | 2,687 | 3,164
Time deposits in denominations of $250,000 or more | 21,900 | 26,687
Time deposits in denominations of $100,000 or more | $ 92,266 | $ 99,649

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- Definition The amount of Reciprocal Transaction deposits made in Money market deposits. + References No definition available. + Details
Name: | hbt_MoneyMarketDepositsReciprocalTransactionDeposits
Namespace Prefix: | hbt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $250,000 or more. + References No definition available. + Details
Name: | hbt_TimeDeposits250000OrMore
Namespace Prefix: | hbt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of Reciprocal Transaction deposits made in Time deposits. + References No definition available. + Details
Name: | hbt_TimeDepositsReciprocalTransactionDeposits
Namespace Prefix: | hbt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph D-E + Details
Name: | us-gaap_TimeDeposits100000OrMore
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_TimeDepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration