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Deposits - Additional Information (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Additional Information |  |
CDARS deposits | $ 23,911,000 | $ 28,847,000
Interest-bearing demand deposits | 18,614,000 | 12,885,000
Money market accounts under CDARS program | 663,000 | 2,171,000
Time deposits under CDARS program | 4,634,000 | 13,791,000
Deposits from executive officers, directors, and their affiliates | $ 4,491,000 | $ 12,636,000

X
- Definition Represents the carrying amount of deposits from related parties as of the balance sheet date. + References No definition available. + Details
Name: | htbk_DepositsFromRelatedParties
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of money in interest-bearing accounts that entitle the depositor to withdraw funds at any time without prior notice, also known as demand deposits. + References No definition available. + Details
Name: | htbk_InterestBearingDepositDemand
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate amount of money market deposits held by the entity within the Certificate of Deposit Account Registry Service program. + References No definition available. + Details
Name: | htbk_MoneyMarketDepositsCdars
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate amount of time deposits and money market deposits held by the entity within the Certificate of Deposit Account Registry Service program. + References No definition available. + Details
Name: | htbk_TimeDepositsAndMoneyMarketDepositsCdars
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate amount of time deposits held by the entity within the Certificate of Deposit Account Registry Service program. + References No definition available. + Details
Name: | htbk_TimeDepositsCdars
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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