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Subsequent Events (Details) - Subsequent Event [Member] | Feb. 08, 2024 $ / shares
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Base And Supplemental Dividend |
Subsequent Event [Line Items] |
Dividend payable per share (in dollars per share) | $ 0.48
Base Dividend |
Subsequent Event [Line Items] |
Dividend payable per share (in dollars per share) | 0.40
Supplemental dividend |
Subsequent Event [Line Items] |
Total supplemental dividends amount to be paid (in dollars per share) | 0.32
Supplemental dividends amount to be paid each quarter (in dollars per share) | $ 0.08

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- Definition Supplemental Dividends Amount To Be Paid Each Quarter Per Share + References No definition available. + Details
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Namespace Prefix: | htgc_
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Balance Type: | na
Period Type: | duration

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- Definition Total Supplemental Dividends Amount To Be Paid Per Share + References No definition available. + Details
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Namespace Prefix: | htgc_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 + Details
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Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483399/855-10-50-2 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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

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

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