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Income Taxes - Components of Low Income Housing Investment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Taxes
Low income housing tax credits	$ 210	$ 106	$ 420	$ 213
Low income housing investment expense	$ 211	$ 106	$ 420	$ 211

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- Definition

Represents information pertaining to investment expense on income tax housing investment.

+ References

No definition available.

+ Details

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- Definition

represents information pertaining to tax credits on income tax housing investment.

+ References

No definition available.

+ Details

Name:	htbk_EstimatedTaxCreditsOnIncomeTaxHousingInvestments
Namespace Prefix:	htbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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