Real Estate Securities - Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Principal balance	$ 217,059	$ 221,933
Credit reserve	(28,208)	(28,739)
Unamortized discount, net	(59,334)	(61,650)
Amortized cost	129,517	131,544
Gross unrealized gains	18,773	16,269
Gross unrealized losses	(10,742)	(13,127)
CECL allowance	(2,568)	(2,540)
Carrying Value	$ 134,980	$ 132,146