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Real Estate Securities - Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Principal balance	$ 230,201	$ 242,852
Credit reserve	(29,901)	(27,555)
Unamortized discount, net	(63,206)	(76,023)
Amortized cost	137,094	139,274
Gross unrealized gains	50,854	67,815
Gross unrealized losses	(2,045)	(297)
CECL allowance	(705)	0
Carrying Value	$ 185,198	$ 206,792

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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