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Organization and Basis of Presentation - Additional Information (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 05, 2022 USD ($) BusinessDays | Jan. 29, 2020 USD ($) shares | Jan. 16, 2020 USD ($) shares | Sep. 27, 2019 USD ($) shares | Mar. 31, 2024 USD ($) shares | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) shares | Aug. 05, 2021 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares | shares |  |  |  | 10 |  |  |  |
Issuance of common stock, net of issuance costs |  |  |  | $ 150 | $ 24,240,000 | $ 4,048,000 |  |
Debt instrument percentage |  |  |  |  | 6.00% |  |  |
Percentage of capital contribution invested in joint venture common equity | 30.00% |  |  |  |  |  |  |
Percentage of capital contribution invested in joint venture debt notes | 70.00% |  |  |  |  |  |  |
Percentage of Secured loan and equipment financing advance offered to purchase | 40.00% |  |  |  |  |  |  |
Percentage of principal amount of loan or equipment financing advance | 100 |  |  |  |  |  |  |
Percentage of fee for loan and advance | 50.00% |  |  |  |  |  |  |
Loan or advance fee payable number of days | BusinessDays | 2 |  |  |  |  |  |  |
Remaining percentage of fee for loan or advance | 50.00% |  |  |  |  |  |  |
Percentage of daily average aggregate value of outstanding loans and equipment financings | 75 |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  | 8,333,333 |  | 48,643,194 |  | 46,323,712 |
Proceeds from issuance of common stock |  |  | $ 114,400,000 |  | $ 24,240,000 | 4,048,000 |  |
Common stock, value |  |  |  |  | 49,000 |  | $ 46,000 |
Net proceeds for the sale of investments |  |  |  |  | $ 52,400,000 |  | 146,200,000 |
Overallotment Option |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  | 1,333,333 | 8,333,333 |  |  |  |  |
Proceeds from issuance of common stock |  | $ 20,000,000 | $ 125,000,000 |  |  |  |  |
Private Offerings | Legacy Funds |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  | 9,183,185 |  |  |  |  |
Common stock, value |  |  | $ 137,700,000 |  |  |  |  |
Payment of common stock value in cash |  |  | $ 108,700,000 |  |  |  |  |
Private Offerings | Equity interests |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  | 533,332 |  |  |  |  |
Common stock, value |  |  | $ 8,000,000 |  |  |  |  |
Payment of common stock value in cash |  |  | $ 2,000,000 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Percentage of Secured loan and equipment financing advance offered to purchase | 25.00% |  |  |  |  |  |  |
Trinity Capital Holdings |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interests acquired |  |  |  |  | 100.00% |  |  |
i 40 LLC |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Initally contributed capital | $ 21,400,000 |  |  |  |  |  |  |
JV Partner |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Initally contributed capital | $ 150,000,000 |  |  |  |  |  |  |
Joint venture ownership percentage |  |  |  |  | 87.50% |  |  |
Trinity Investor J V I L L C |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Initally contributed capital |  |  |  |  | $ 13,400,000 |  | 11,000,000 |
Total Investments at fair value |  |  |  |  | 202,000,000 |  | 151,600,000 |
Unfunded capital commitment |  |  |  |  | 8,000,000 |  | 10,400,000 |
Trinity Investor J V I L L C | Debt |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Total Investments at fair value |  |  |  |  | 9,400,000 |  | 7,700,000 |
Trinity Investor J V I L L C | Equity |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Total Investments at fair value |  |  |  |  | $ 4,000,000 |  | 3,300,000 |
Senior Credit Corp 2022 LLC |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Joint venture ownership percentage |  |  |  |  | 12.50% |  |  |
Corporate Joint Venture | Other assets |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Other receivables |  |  |  |  | $ 1,000,000 |  | $ 800,000 |
Corporate Joint Venture | Fee Income |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Origination and administrative agent fees |  |  |  |  | $ 900,000 | $ 500,000 |  |
8.5% Notes |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Debt instrument percentage | 8.50% |  |  |  |  |  |  |
7.00% Notes due 2025 |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Debt instrument percentage |  |  | 7.00% |  |  |  |  |
7.00% Notes due 2025 | Private Offerings |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 125,000,000 |  |  |  |  |
Trinity Funding 1, LLC | Credit Suisse Credit Facility |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Credit facility |  |  | $ 300,000,000 |  |  |  |  |
TrinCap Funding, LLC | KeyBank Credit Facility |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Credit facility |  |  |  |  |  |  |  | $ 350,000,000

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