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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%