Loan Servicing - SBA Loans (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans and Allowance for Credit Losses on Loans
Serviced SBA loans sold to secondary market	$ 55,845,000	$ 64,819,000	$ 73,256,000
Weighted average servicing rate for loans serviced (as a percent)	1.09%	1.10%	1.11%

Represents the amount of serviced small business administration loans sold to the secondary market as of the balance sheet date.

No definition available.

Name:	htbk_ServicingAssetLoansHeldForSaleSmallBusinessAdministrationLoansSoldToSecondaryMarket
Namespace Prefix:	htbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant