Represents the amount of decrease in interest expense in the period on debt arrangements due to redemption.

No definition available.

Name:	htbk_DebtInstrumentDecreaseInInterestExpenseDueToRedemption
Namespace Prefix:	htbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the amount of interest on debt instruments to be paid on redemption date.

+ References

No definition available.

+ Details

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

- Definition

Represents the face amount of subordinated debt, which is to be redeemed.

+ References

No definition available.

+ Details

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

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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

- Definition

Dividends received on equity and other investments during the current period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 27

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

+ Details

Name:	us-gaap_ProceedsFromDividendsReceived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

Subsequent Event (Details) (Subordinated debentures, USD $)	3 Months Ended			6 Months Ended				1 Months Ended
	Sep. 30, 2012	Jun. 05, 2013 Heritage Statutory Trust II	Jun. 05, 2013 Heritage Statutory Trust III	Jun. 30, 2013 Floating-Rate Sub Debt	Jun. 30, 0013 Floating-Rate Sub Debt	Jul. 31, 2013 Subsequent event Heritage Statutory Trust II	Sep. 26, 2013 Subsequent event Heritage Statutory Trust III Forecast	Jul. 31, 2013 Subsequent event Floating-Rate Sub Debt
Subsequent event
Amount of debt to be redeemed		$ 5,000,000	$ 4,000,000
Subordinated debt, redemption amount						5,000,000	4,000,000
Interest to be paid on redemption date				90,000
Dividends received from HBC as approved by DFI	15,000,000							9,000,000
Agency origination fees incurred					167,000
Elimination in interest expense due to redemption				$ 360,000