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Selected Quarterly Financial Data (unaudited) - Schedule of Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investment income | $ 27,474 | $ 24,992 | $ 21,153 | $ 20,518 | $ 24,101 | $ 21,229 | $ 21,826 | $ 23,290 | $ 23,630 | $ 21,077 | $ 20,433 | $ 19,983 | $ 94,137 | $ 90,446 | $ 85,123 |  |  |  |  |  |  |  |
Net investment income | 12,484 | 12,719 | 11,008 | 10,338 | 2,448 | 5,118 | 6,473 | 11,081 | 6,038 | 6,902 | 9,291 | 17,417 | 46,549 | 25,120 | 39,648 |  |  |  |  |  |  |  |
Net increase in net assets from operations | $ 4,723 | $ 11,428 | $ 7,981 | $ 11,690 | $ 50,238 | $ 28,442 | $ 25,886 | $ 11,538 | $ 29,517 | $ 20,707 | $ 7,973 | $ (26,971) | $ 35,822 | $ 116,104 | $ 31,226 |  |  |  |  |  |  |  |
Net investment income per share-basic | $ 0.51 | $ 0.52 | $ 0.45 | $ 0.42 | $ 0.10 | $ 0.21 | $ 0.26 | $ 0.45 | $ 0.25 | $ 0.28 | $ 0.38 | $ 0.71 | $ 1.90 | $ 1.03 | $ 1.62 |  |  |  |  |  |  |  |
Net investment income per share-diluted | 0.51 | 0.52 | 0.45 | 0.42 | 0.10 | 0.21 | 0.26 | 0.45 | 0.25 | 0.28 | 0.38 | 0.71 | 1.90 | 1.03 | 1.62 |  |  |  |  |  |  |  |
Net increase in net assets from operations per share | 0.19 | 0.47 | 0.33 | 0.48 | 2.06 | 1.16 | 1.06 | 0.47 | 1.20 | 0.85 | 0.33 | (1.10) | 1.46 | 4.75 | 1.28 |  |  |  |  |  |  |  |
Net asset value per share at end of period | $ 19.43 | $ 19.41 | $ 19.80 | $ 19.91 | $ 19.96 | $ 18.31 | $ 17.57 | $ 16.90 | $ 16.81 | $ 15.94 | $ 15.39 | $ 15.37 | $ 19.43 | $ 19.96 | $ 16.81 | $ 16.85 | $ 16.47 | $ 16.05 | $ 15.76 | $ 15.17 | $ 15.16 | $ 15.35 | $ 15.32

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