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v3.20.4

Benefit Plans - Deferred Compensation Plan (Details) - employee | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Deferred Compensation Plan |  |
Maximum percentage of bonus into deferred account | 100.00% |
Percentage of regular salary into deferred account | 50.00% |
Number of employees elected to participate in deferred compensation | 8 | 5

X
- Definition Represents the maximum percentage of bonus into deferred account. + References No definition available. + Details
Name: | htbk_DeferredCompensationArrangementMaximumPercentageOfBonusIntoDeferredAccount
Namespace Prefix: | htbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of regular salary into a deferred account. + References No definition available. + Details
Name: | htbk_DeferredCompensationArrangementPercentageOfRegularSalaryIntoDeferredAccount
Namespace Prefix: | htbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the employees who elected to participate in the deferred compensation. + References No definition available. + Details
Name: | htbk_NumberOfEmployeesElectedToParticipateInDeferredCompensation
Namespace Prefix: | htbk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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