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Portfolio Company Investments - Schedule of Portfolio Composition by Geographic Region at Fair Value and Cost and as Percentage of Total Investments (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Summary of Investment Holdings [Line Items] |  |
Investments at Fair Value | $ 856,914 | $ 719,124
Percentage of Fair Value | 100.00% | 100.00%
Investments at cost | $ 827,390 | $ 621,786
Percentage of Cost | 100.00% | 100.00%
Midwest |  |
Summary of Investment Holdings [Line Items] |  |
Investments at Fair Value | $ 185,994 | $ 157,222
Percentage of Fair Value | 21.70% | 21.90%
Investments at cost | $ 140,728 | $ 89,865
Percentage of Cost | 17.00% | 14.50%
Southeast |  |
Summary of Investment Holdings [Line Items] |  |
Investments at Fair Value | $ 250,549 | $ 219,988
Percentage of Fair Value | 29.20% | 30.60%
Investments at cost | $ 252,173 | $ 197,380
Percentage of Cost | 30.50% | 31.70%
Northeast |  |
Summary of Investment Holdings [Line Items] |  |
Investments at Fair Value | $ 123,890 | $ 126,569
Percentage of Fair Value | 14.50% | 17.60%
Investments at cost | $ 128,203 | $ 127,809
Percentage of Cost | 15.50% | 20.60%
West |  |
Summary of Investment Holdings [Line Items] |  |
Investments at Fair Value | $ 154,927 | $ 105,918
Percentage of Fair Value | 18.10% | 14.70%
Investments at cost | $ 160,958 | $ 100,098
Percentage of Cost | 19.40% | 16.10%
Southwest |  |
Summary of Investment Holdings [Line Items] |  |
Investments at Fair Value | $ 141,554 | $ 109,427
Percentage of Fair Value | 16.50% | 15.20%
Investments at cost | $ 145,328 | $ 106,634
Percentage of Cost | 17.60% | 17.10%

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