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Loan Servicing - SBA Loans (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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.

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No definition available.

+ Details

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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