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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | Oct. 31, 2023 | Oct. 30, 2023 | Aug. 01, 2023 | May 02, 2023 | Feb. 15, 2023 | Nov. 03, 2022 | May 02, 2022 | Feb. 15, 2022 | Nov. 01, 2021 | Aug. 02, 2021 | May 03, 2021 | Feb. 09, 2021 | Nov. 01, 2023 | Oct. 26, 2023 | Oct. 11, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 895,362 | [1],[2],[3] | $ 828,693 | [4],[5],[6] |
Dividends to stockholders |  |  | $ 0.41 | $ 0.41 | $ 0.41 |  | $ 0.36 | $ 0.36 | $ 0.32 | $ 0.32 | $ 0.31 | $ 0.31 |  |  |  | $ 2.08 |  | $ 2 |  | $ 1.6
Dividend payable date |  |  | Sep. 27, 2023 | Jun. 28, 2023 | Mar. 29, 2023 |  | Jun. 24, 2022 | Mar. 25, 2022 | Dec. 17, 2021 | Sep. 28, 2021 | Jun. 28, 2021 | Mar. 26, 2021 |  |  |  |  |  |  |  |
Dividend record date |  |  | Sep. 20, 2023 | Jun. 21, 2023 | Mar. 22, 2023 |  | Jun. 10, 2022 | Mar. 11, 2022 | Dec. 03, 2021 | Sep. 14, 2021 | Jun. 14, 2021 | Mar. 12, 2021 |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  | Oct. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date |  | Dec. 27, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  | Dec. 20, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events | SBA Debentures | 6.083% Fixed Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 |  |  |  |  |  |
Debt instrument interim interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.083% |  |  |  |  |  |
First Lien Debt and Preferred Equity | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost | $ 13,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment acquisition date | Oct. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Lien Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 521,345 |  | $ 453,585 |  |
Second Lien Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 182,245 |  | $ 213,654 |  |
White Label Communications, LLC | First Lien Debt and Preferred Equity | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,000 |  |  |  |  |
GP&C Operations, LLC | First Lien Debt | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  | $ 10,838 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power Grid Components, Inc | Second Lien Debt | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost | $ 10,269 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined Systems, Inc | First Lien Debt | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,228 |  |  |  |  |  |  |
Quarterly Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  | $ 0.43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  | $ 0.21 | $ 0.19 | $ 0.15 | $ 0.08 | $ 0.07 | $ 0.17 | $ 0.04 | $ 0.06 | $ 0.08 | $ 0.07 |  |  |  |  |  |  |  |
Dividend payable date |  |  | Sep. 27, 2023 | Jun. 28, 2023 | Mar. 29, 2023 | Dec. 16, 2022 | Jun. 24, 2022 | Mar. 25, 2022 | Dec. 17, 2021 | Sep. 28, 2021 | Jun. 28, 2021 | Mar. 26, 2021 |  |  |  |  |  |  |  |
Dividend record date |  |  | Sep. 20, 2023 | Jun. 21, 2023 | Mar. 22, 2023 | Dec. 02, 2022 | Jun. 10, 2022 | Mar. 11, 2022 | Dec. 03, 2021 | Sep. 14, 2021 | Jun. 14, 2021 | Mar. 12, 2021 |  |  |  |  |  |  |  |
Supplemental Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  | 0.27 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 |  |  | $ 0.05 | $ 0.04 |  |  |  |  |  |  |  |  |  |
Dividend payable date |  |  | Sep. 27, 2023 | Jun. 28, 2023 |  | Dec. 16, 2022 |  |  | Dec. 17, 2021 | Sep. 28, 2021 |  |  |  |  |  |  |  |  |  |
Dividend record date |  |  | Sep. 20, 2023 | Jun. 21, 2023 | Mar. 22, 2023 | Dec. 02, 2022 |  |  | Dec. 03, 2021 | Sep. 14, 2021 |  |  |  |  |  |  |  |  |  |
Special Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  | $ 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | (a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[2] | (b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[3] | (c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[4] | (a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[5] | (b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[6] | (c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.

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