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Premises and Equipment - Depreciation and Amortization Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Premises and Equipment
Depreciation and amortization	$ 951,000	$ 846,000	$ 753,000

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets or depleting assets to periods that benefit from use of the assets.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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