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Deposits - Time Deposits (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Deposits. |  |
Time deposits, including deposits within the CDARS and brokered deposits, $250,000 or more | $ 103,746,000 | $ 99,882,000

X
- Definition Represents the aggregate amount of domestic and foreign time deposit liabilities including deposits within the Certificate of Deposit Account Registry Service program and brokered deposits in denominations of $250,000 or more. + References No definition available. + Details
Name: | htbk_TimeDepositsIncludingDepositsWithinCertificateOfDepositAccountRegistryServiceAndBrokeredDeposits250000OrMore
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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