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Securities - Securities Pledged to Secure Public Deposits and for Other Purposes (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Securities Pledged to Secure Public Deposits and for Other Purposes |  |
Amortized cost of securities pledged to secure public deposits and for other purposes as required or permitted by law or contract | $ 43,398 | $ 32,773

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- Definition The amortized cost of available-for-sale securities that serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References No definition available. + Details
Name: | htbk_AvailableForSaleSecuritiesPledgedAsCollateralAmortizedCost
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Not applicable. + References No definition available. + Details
Name: | htbk_DebtSecuritiesAvailableForSaleSecuritiesOtherDisclosureItemsAbstract
Namespace Prefix: | htbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration