Loans Held for Investment and the Allowance for Credit Losses - Summary of Loans Held for Investment Portfolio Activity (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance as of January 1, 2022	$ 4,867,203
Loans originated	535,053
Additional fundings	58,558
Amortization of origination fees	3,627
Collection of principal	(804,417)
Collection of accrued PIK interest	(613)
(Increase) of allowance for credit losses	(42,157)
Balance as of June 30, 2022	$ 4,617,254