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Borrowings - Schedule of Interest Expense, Deferred Financing Costs, Average Outstanding Balance, and Average Stated Interest Rate (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Debt Instrument [Line Items]      
Interest expense $ 4,298 $ 5,725  
Deferred financing costs $ 309 273  
Average stated interest rate 5.90%   6.20%
4.875% Notes due 2026      
Debt Instrument [Line Items]      
Interest expense $ 1,316 1,316  
Amortization of original issue discount 130 124  
Deferred financing costs 55 66  
Total interest and financing expenses 1,501 1,506  
Average outstanding balance $ 108,000 $ 108,000  
Average stated interest rate 4.88% 4.88%  
2018-2 Secured Notes      
Debt Instrument [Line Items]      
Interest expense   $ 2,201  
Amortization of original issue discount   0  
Total interest and financing expenses   2,201  
Average outstanding balance   $ 110,516  
Average stated interest rate   7.90%  
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility      
Debt Instrument [Line Items]      
Interest expense $ 2,673 $ 1,935  
Deferred financing costs 124 83  
Total interest and financing expenses 2,797 2,018  
Average outstanding balance $ 153,471 $ 92,000  
Average stated interest rate 6.82% 8.13%