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v3.20.4

Fair Value - Impaired Loans Held-for-investment - Additional Disclosures (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Carrying amount |  |
Impaired Loans Held-for-investment |  |
Foreclosed assets | $ 0 | $ 0

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- Definition Fair value of foreclosed assets. + References No definition available. + Details
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Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |