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Real Estate Securities - Carrying Value of AFS Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Principal balance	$ 242,852	$ 283,284
Credit reserve	(27,555)	(44,967)
Unamortized discount, net	(76,023)	(95,718)
Amortized cost	139,274	142,599
Gross unrealized gains	67,815	77,294
Gross unrealized losses	(297)	(1,047)
CECL credit allowance	0	(388)	$ 0
Carrying Value	206,792	218,458
Mezzanine
Debt Securities, Available-for-sale [Line Items]
Principal balance	0	2,000
Credit reserve	0	0
Unamortized discount, net	0	0
Amortized cost	0	2,000
Gross unrealized gains	0	14
Gross unrealized losses	0	0
CECL credit allowance	0	0
Carrying Value	0	2,014
Subordinate Securities
Debt Securities, Available-for-sale [Line Items]
Principal balance	242,852	281,284
Credit reserve	(27,555)	(44,967)
Unamortized discount, net	(76,023)	(95,718)
Amortized cost	139,274	140,599
Gross unrealized gains	67,815	77,280
Gross unrealized losses	(297)	(1,047)
CECL credit allowance	0	(388)
Carrying Value	$ 206,792	$ 216,444

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