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Benefit Plans - Employee Stock Ownership Plan (Details) | 12 Months Ended
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Dec. 31, 2020 item shares
Employee Stock Ownership Plan |
Minimum number of hours of service required for plan eligibility | item | 1,000
Number of shares of Company's common stock owned by ESOP | shares | 101,231

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- Definition Represents the minimum number of hours of service required in order to be eligible to participate in the plan. + References No definition available. + Details
Name: | htbk_EmployeeStockOwnershipPlanEsopHoursOfServiceRequiredForPlanEligibilityMinimum
Namespace Prefix: | htbk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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