Capital Requirements - Dividends to Parent (Details) $ in Thousands	Jan. 01, 2016 USD ($)
HCC (Parent)
Cash dividend
Cash dividend available	$ 22,361

This element represents disclosure of the aggregate cash dividends available to be paid to the entity by the consolidated subsidiary.

No definition available.

Name:	htbk_CashDividendsPaidToParentCompanyByConsolidatedSubsidiariesAmountAvailable
Namespace Prefix:	htbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant