Investments - Composition of Investment Portfolio At Cost And Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	May 12, 2021
Schedule of Equity Method Investments [Line Items]
Cost	$ 3,117,330	$ 2,467,727	$ 602,400
Fair Value	$ 3,094,065	$ 2,458,929
Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	100.00%	100.00%
Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	100.00%	100.00%
Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Cost	$ 2,552,342	$ 1,981,715
Fair Value	$ 2,503,156	$ 1,958,306
Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	82.00%	80.00%
Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	81.00%	80.00%
CPCF BPCC LLC
Schedule of Equity Method Investments [Line Items]
Cost	$ 222,535	$ 211,115
Fair Value	$ 219,644	$ 212,256
CPCF BPCC LLC | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	100.00%	100.00%
CPCF BPCC LLC | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	100.00%	100.00%
CPCF BPCC LLC | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Cost	$ 222,535	$ 211,115
Fair Value	$ 219,644	$ 212,256
CPCF BPCC LLC | Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	100.00%	100.00%
CPCF BPCC LLC | Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	100.00%	100.00%
Thompson Rivers LLC
Schedule of Equity Method Investments [Line Items]
Cost	$ 207,570	$ 386,657
Fair Value	$ 193,351	$ 366,731
Thompson Rivers LLC | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	100.00%	100.00%
Thompson Rivers LLC | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	100.00%	100.00%
Thompson Rivers LLC | Federal Housing Administration (“FHA”) loans
Schedule of Equity Method Investments [Line Items]
Cost	$ 193,265	$ 360,847
Fair Value	$ 179,963	$ 342,240
Thompson Rivers LLC | Federal Housing Administration (“FHA”) loans | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	93.00%	93.00%
Thompson Rivers LLC | Federal Housing Administration (“FHA”) loans | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	93.00%	93.00%
Thompson Rivers LLC | Veterans Affairs (“VA”) loans
Schedule of Equity Method Investments [Line Items]
Cost	$ 14,305	$ 25,810
Fair Value	$ 13,388	$ 24,491
Thompson Rivers LLC | Veterans Affairs (“VA”) loans | Cost | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	7.00%	7.00%
Thompson Rivers LLC | Veterans Affairs (“VA”) loans | Fair Value | Investment Type Concentration Risk
Schedule of Equity Method Investments [Line Items]
Percent of Total Portfolio	7.00%	7.00%