Income Taxes - Liability for Uncertain Tax Positions (Details) $ in Thousands	9 Months Ended
Sep. 30, 2016 USD ($)
Income Taxes
Reserve for income taxes, net of Federal benefit for uncertain tax positions	$ 2

Represents information pertaining to income tax reserve for uncertain tax positions.

No definition available.

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