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Loans and Allowance for Credit Losses on Loans - Amortized Cost Basis of Collateral-dependent Loans (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Financing Receivable, Recorded Investment, Past Due [Line Items] |
Collateral dependent loans | $ 1,974
Real Estate |
Financing Receivable, Recorded Investment, Past Due [Line Items] |
Collateral dependent loans | 29
Business Assets |
Financing Receivable, Recorded Investment, Past Due [Line Items] |
Collateral dependent loans | 1,815
Uncollateralized |
Financing Receivable, Recorded Investment, Past Due [Line Items] |
Collateral dependent loans | 130
Commercial |
Financing Receivable, Recorded Investment, Past Due [Line Items] |
Collateral dependent loans | 1,974
Commercial | Real Estate |
Financing Receivable, Recorded Investment, Past Due [Line Items] |
Collateral dependent loans | 29
Commercial | Business Assets |
Financing Receivable, Recorded Investment, Past Due [Line Items] |
Collateral dependent loans | 1,815
Commercial | Uncollateralized |
Financing Receivable, Recorded Investment, Past Due [Line Items] |
Collateral dependent loans | $ 130

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- Definition The values of collateral dependent loans. + References No definition available. + Details
Name: | htbk_CollateralDependentLoans
Namespace Prefix: | htbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CollateralAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CollateralAxis=htbk_BusinessAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CollateralAxis=us-gaap_UncollateralizedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=htbk_CommercialFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |