Fair Value Measurement - Sensitivity of Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loans (at fair value)
Discount rates
100 basis point increase	$ (7,525)	$ (3,392)
200 basis point increase	(14,901)	(6,709)
Expected credit loss rates on underlying loans
10% adverse change	(8,626)	(3,959)
20% adverse change	(17,269)	(7,927)
Expected prepayment rates
10% adverse change	(2,395)	(239)
20% adverse change	(4,739)	(512)
Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Aggregate fair value of loans purchased and held	623,763	252,477
Fair Value, Inputs, Level 3 | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Aggregate fair value of loans purchased and held	$ 623,763	$ 252,477