Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Income Taxes
Reserve for income taxes for uncertain tax positions	$ 250

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