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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
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 860,329 $ 719,124
Percentage of Fair Value 100.00% 100.00%
Investments at cost $ 828,693 $ 621,786
Percentage of Cost 100.00% 100.00%
United States Midwest    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 180,556 $ 157,222
Percentage of Fair Value 21.00% 21.90%
Investments at cost $ 132,177 $ 89,865
Percentage of Cost 16.00% 14.50%
United States Southeast    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 265,902 $ 219,988
Percentage of Fair Value 31.00% 30.60%
Investments at cost $ 258,373 $ 197,380
Percentage of Cost 31.10% 31.70%
United States Northeast    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 127,427 $ 126,569
Percentage of Fair Value 14.80% 17.60%
Investments at cost $ 134,897 $ 127,809
Percentage of Cost 16.30% 20.60%
United States West    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 151,487 $ 105,918
Percentage of Fair Value 17.60% 14.70%
Investments at cost $ 161,935 $ 100,098
Percentage of Cost 19.50% 16.10%
United States Southwest    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 122,519 $ 109,427
Percentage of Fair Value 14.20% 15.20%
Investments at cost $ 128,873 $ 106,634
Percentage of Cost 15.60% 17.10%
Canada    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 12,438  
Percentage of Fair Value 1.40%  
Investments at cost $ 12,438  
Percentage of Cost 1.50%