Loans Held for Investment - Loan Risk Ratings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	26	5
Carrying Value | $	$ 570,780	$ 91,879
Risk Rating, 1
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	0	0
Carrying Value | $	$ 0	$ 0
Risk Rating, 2
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	4	0
Carrying Value | $	$ 94,743	$ 0
Risk Rating, 3
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	21	5
Carrying Value | $	$ 463,600	$ 91,879
Risk Rating, 4
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	1	0
Carrying Value | $	$ 12,437	$ 0
Risk Rating, 5
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	0	0
Carrying Value | $	$ 0	$ 0