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v3.20.4

Income Taxes - Components of Low Income Housing Investment (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Taxes |  |
Low income housing tax credits | $ 839,000 | $ 511,000
Low income housing investment expense | $ 850,000 | $ 520,000

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- Definition Represents information pertaining to investment expense on income tax housing investment. + References No definition available. + Details
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Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition represents information pertaining to tax credits on income tax housing investment. + References No definition available. + Details
Name: | htbk_EstimatedTaxCreditsOnIncomeTaxHousingInvestments
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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