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Income Taxes - Components of Low Income Housing Investment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Taxes
Low income housing tax credits	$ 110	$ 111
Low income housing investment losses	$ 115	$ 117

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- Definition

Represents information pertaining to investment losses 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

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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