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Loan Servicing - SBA Loans (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Allowance for Credit Losses on Loans |  |  |
Serviced SBA loans sold to secondary market | $ 77,973,000 | $ 87,835,000 | $ 104,016,000
Weighted average servicing rate for loans serviced (as a percent) | 1.12% | 1.16% | 1.12%

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- Definition Represents the amount of serviced small business administration loans sold to the secondary market as of the balance sheet date. + References No definition available. + Details
Name: | htbk_ServicingAssetLoansHeldForSaleSmallBusinessAdministrationLoansSoldToSecondaryMarket
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the weighted average servicing rate for loans serviced. + References No definition available. + Details
Name: | htbk_ServicingAssetWeightedAverageServicingRateForLoansServiced
Namespace Prefix: | htbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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