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Investments - Schedule of Loan Exit Fees Receivable (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Exit Fees Receivable | $ 36.4 | $ 37.5
Included in Cost [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Exit Fees Receivable | 33.0 | 32.5
Deferred Fees [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Exit Fees Receivable | $ 3.4 | $ 5.0

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- Definition Exit fees receivable. + References No definition available. + Details
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Namespace Prefix: | htgc_
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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=htgc_IncludedInCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=htgc_DeferredFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |