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Investments - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) portfolio_company structured_finance_note	Sep. 30, 2023 USD ($) portfolio_company structured_finance_note	Dec. 31, 2022 USD ($) portfolio_company structured_finance_note
Schedule of Investments [Line Items]
Number of non-portfolio investments | structured_finance_note	23	23	23
Investment, amortized cost, nonaccrual	$ 11,843
Investment, fair value, nonaccrual	6,436
Amortized cost of loans on non-accrual status	39,155	$ 39,155	$ 36,522
Fair value of loans on non-accrual status	$ 16,698	$ 16,698	$ 11,225
Portfolio Net Assets | Investment Concentration Risk | Pfanstiehl Holdings, Inc
Schedule of Investments [Line Items]
Concentration risk, percentage		45.20%
Portfolio Fair Value | Investment Concentration Risk | Pfanstiehl Holdings, Inc
Schedule of Investments [Line Items]
Concentration risk, percentage		16.90%
Debt investments
Schedule of Investments [Line Items]
Number of portfolio companies | portfolio_company	43	43	52
Senior Secured Loans
Schedule of Investments [Line Items]
Investment percentage	99.00%	99.00%	99.60%
Subordinated Loans
Schedule of Investments [Line Items]
Investment percentage	1.00%	1.00%	0.40%
Equity investments
Schedule of Investments [Line Items]
Number of portfolio companies | portfolio_company	15	15	16

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