Variable Interest Entities and Collateralized Loan Obligations - Schedule of Borrowings and Corresponding Collateral (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Other loan held for investment, net	$ 1,100
Collateral (loans), Outstanding principal	1,619,567	$ 1,719,735
Collateralized Loan Obligation
Debt Instrument [Line Items]
Collateral (loans), Outstanding principal	$ 3,395,746	$ 3,164,710