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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	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Principal balance	$ 149,991		$ 221,933
Credit reserve	(23,890)		(28,739)
Unamortized discount, net	(46,603)		(61,650)
Amortized cost	79,498		131,544
Gross unrealized gains	13,463		16,269
Gross unrealized losses	(8,984)		(13,127)
CECL allowance	(2,573)	$ (2,639)	(2,540)
Carrying Value	$ 81,404		$ 132,146

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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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