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v3.20.4

Capital Requirements - General Information (Details) |  | 12 Months Ended
--- | --- | ---
Mar. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Capital Requirements |  |  |
Period to delay the estimated impact of the adoption of the CECL Standard to regulatory capital as the company elected the option | 2 years |  |
Addition period for transition | 3 years |  |
HBC (Wholly-owned Subsidiary) |  |  |
Capital Requirements |  |  |
Capital conservation buffer (as a percent) |  | 2.50% | 2.50%

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- Definition Addition period for transition period besides the period to delay the estimated impact of the adoption of the CECL Standard to regulatory capital as the company elected the option. + References No definition available. + Details
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- Definition Capital conservation buffer ratio. + References No definition available. + Details
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Namespace Prefix: | htbk_
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Balance Type: | na
Period Type: | duration

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- Definition Period to delay the estimated impact of the adoption of the CECL Standard to regulatory capital as the company elected the option. + References No definition available. + Details
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Namespace Prefix: | htbk_
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |