Loans Held for Investment - Loan Portfolio Statistics (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Receivables [Abstract]
Number of Loans | loan	26	5
Total loan commitments	$ 648,266	$ 111,720
Unfunded loan commitments	57,772	18,857
Principal balance	590,590	92,863
Carrying value	$ 570,780	$ 91,879
Weighted average coupon rate	4.54%	5.08%
Weighted average all in yield	5.08%	5.71%
Weighted average LIBOR floor	0.68%	0.78%
Weighted average maximum maturity (years)	3 years 9 months 18 days	4 years 2 months 12 days
Weighted average risk rating	2.9	3.0
Financing receivable, capitalized interest	$ 96