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Income Taxes - Components of Low Income Housing Investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Taxes |  |  |  |
Low income housing tax credits | $ 210 | $ 106 | $ 420 | $ 213
Low income housing investment expense | $ 211 | $ 106 | $ 420 | $ 211

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