Fair Value Measurement - Sensitivity of Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans (at fair value)
Discount rates
100 basis point increase	$ (7,549)	$ (3,392)
200 basis point increase	(14,941)	(6,709)
Expected credit loss rates on underlying loans
10% adverse change	(8,915)	(3,959)
20% adverse change	(17,790)	(7,927)
Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Aggregate fair value of loans purchased and held	597,981	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	$ 597,981	$ 252,477