Commitments and Contingencies - Loss Contingencies (Details)	12 Months Ended
Dec. 31, 2015 item
Commitments and Contingencies
Number of claims set for trial	1
Number of complaints in pleading and in mid-discovery	3
Number of complaint in mid-discovery	1

Number of complaints in pleading and in mid-discovery.

No definition available.

Name:	htbk_NumberOfComplaintsInPleadingAndInMidDiscovery
Namespace Prefix:	htbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration