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Quarterly Financial Data (Unaudited) - Acquisition and Integration Costs (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Combinations |  |  |  |  |  |  |  |  |  |
Total merger-related costs | $ 101,000 | $ 17,000 | $ 59,000 | $ 2,424,000 | $ 9,879,000 | $ 661,000 | $ 540,000 | $ 2,601,000 | $ 11,080,000 | $ 9,167,000
Banking |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |
Total merger-related costs |  |  |  |  |  |  |  | $ 2,601,000 | $ 11,080,000 | $ 9,167,000

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_BusinessCombinationDescriptionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=htbk_BankingSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |