Fair Value Measurement - Sensitivity of Fair Value (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of beneficial interests	$ 28,664,000	$ 0
Loans (at fair value)
Discount rates
100 basis point increase	9,752,000	11,979,000
200 basis point increase	19,314,000	23,720,000
Expected credit loss rates on underlying loans
10% adverse change	10,152,000	11,927,000
20% adverse change	20,302,000	23,852,000
Expected prepayment rates
10% adverse change	(2,108,000)	(2,284,000)
20% adverse change	(4,209,000)	(4,530,000)
Beneficial Interests
Discount rates
100 basis point increase	(724,000)
200 basis point increase	(1,422,000)
Expected credit loss rates on underlying loans
10% adverse change	(5,033,000)
20% adverse change	(12,962,000)
Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of loans	837,565,000	1,010,421,000
Fair value of beneficial interests	28,664,000
Fair Value, Inputs, Level 3 | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of loans	$ 837,565,000	$ 1,010,421,000