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Premises and Equipment - Depreciation and Amortization Expense (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Premises and Equipment |  |  |
Depreciation and amortization | $ 951,000 | $ 846,000 | $ 753,000

X
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets or depleting assets to periods that benefit from use of the assets. + References No definition available. + Details
Name: | htbk_DepreciationDepletionAndAmortizationExcludingAmortizationOfIntangibleAssets
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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