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Investments - Schedule of Composition of Portfolio Investments by Geographic Region (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule Of Investments [Line Items]
Cost	$ 1,147,209	$ 1,153,584
Cost, Percentage	100.00%	100.00%
Fair Value	$ 1,091,531	$ 1,094,386
Fair Value, Percentage	100.00%	100.00%
Multi-Sector Holdings
Schedule Of Investments [Line Items]
Cost	$ 5,184
Cost, Percentage	0.50%
Fair Value	$ 5,184
Fair Value, Percentage	0.50%
West
Schedule Of Investments [Line Items]
Cost	$ 432,235	$ 454,226
Cost, Percentage	37.60%	39.30%
Fair Value	$ 425,110	$ 441,602
Fair Value, Percentage	39.00%	40.30%
Northeast
Schedule Of Investments [Line Items]
Cost	$ 332,098	$ 321,980
Cost, Percentage	28.90%	27.90%
Fair Value	$ 321,891	$ 310,322
Fair Value, Percentage	29.50%	28.40%
Mountain
Schedule Of Investments [Line Items]
Cost	$ 137,569	$ 122,862
Cost, Percentage	12.00%	10.70%
Fair Value	$ 134,221	$ 122,139
Fair Value, Percentage	12.30%	11.20%
South
Schedule Of Investments [Line Items]
Cost	$ 103,246	$ 103,244
Cost, Percentage	9.00%	8.90%
Fair Value	$ 80,214	$ 79,018
Fair Value, Percentage	7.30%	7.20%
Midwest
Schedule Of Investments [Line Items]
Cost	$ 54,799	$ 58,284
Cost, Percentage	4.80%	5.10%
Fair Value	$ 45,945	$ 50,636
Fair Value, Percentage	4.20%	4.60%
Southeast
Schedule Of Investments [Line Items]
Cost	$ 10,153	$ 11,290
Cost, Percentage	0.90%	1.00%
Fair Value	$ 9,937	$ 11,144
Fair Value, Percentage	0.90%	1.00%
i40, LLC
Schedule Of Investments [Line Items]
Cost	$ 5,184
Cost, Percentage	0.50%	0.00%
Fair Value	$ 5,184
Fair Value, Percentage	0.50%	0.00%
Canada
Schedule Of Investments [Line Items]
Cost	$ 44,194	$ 52,406
Cost, Percentage	3.90%	4.50%
Fair Value	$ 41,474	$ 50,289
Fair Value, Percentage	3.80%	4.60%
Western Europe
Schedule Of Investments [Line Items]
Cost	$ 27,731	$ 29,292
Cost, Percentage	2.40%	2.60%
Fair Value	$ 27,555	$ 29,236
Fair Value, Percentage	2.50%	2.70%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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