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

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- 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

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- References

No definition available.

+ Details

Name:	us-gaap_DepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration