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Portfolio Company Investments - Additional Information (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Investment
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Investment
Schedule of Investments [Line Items]      
Number of investment portfolio companies | Investment 92   87
Number of residual investment porfolio companies | Investment 6   4
Aggregate fair value of total portfolio $ 1,192,748,000   $ 1,090,506,000
Weighted average yield investment percentage 13.00%   13.30%
Average fully diluted equity ownership percentage 2.00%   2.00%
Percentage of equity investments held in portfolio companies 87.80%   85.70%
Purchases of debt and equity investments $ 284,480,000 $ 274,194,000  
Proceeds from sales and repayments $ 203,319,000 $ 154,109,000  
Number of investments represented more than ten percentage of aggregate investment portfolio | Investment 0   0
Investment $ 0   $ 0
Investments as percentage of total assets 5.00%   5.00%
Investment, Type [Extensible Enumeration] Pfanstiehl Inc [Member]   Pfanstiehl Inc [Member]
Maximum      
Schedule of Investments [Line Items]      
Investment maturity period 7 years    
Minimum      
Schedule of Investments [Line Items]      
Investment maturity period 5 years