Fair Value (Details 3) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Impaired loans held-for-investment carried at fair value
Partial charge-offs		$ 107,000
Additional provision (credit) for loan losses	165,000	(100,000)
Net carrying amount of foreclosed assets	1,716,000us-gaap_ForeclosedAssets	696,000us-gaap_ForeclosedAssets
Valuation allowance on foreclosed assets	$ 0htbk_ForeclosedAssetsValuationAllowance

Represents the amount of valuation allowance on foreclosed assets as of the balance sheet date.

No definition available.

Name:	htbk_ForeclosedAssetsValuationAllowance
Namespace Prefix:	htbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the additional provision for loan losses because of partial charge-offs and changes in specific valuation allowance during the period.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of loans that have been partially charged-off from loan receivables.

+ References

No definition available.

+ Details

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

- Details

Name:	htbk_ImpairedFinancingReceivableRecordedInvestmentAdditionalDisclosureAbstract
Namespace Prefix:	htbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522

+ Details

Name:	us-gaap_ForeclosedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant