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Income Taxes - Components of Low Income Housing Investment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Low income housing tax credits	$ 839,000	$ 511,000
Low income housing investment expense	$ 850,000	$ 520,000

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	htbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

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