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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	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Principal balance	$ 254,784		$ 283,284
Credit reserve	(40,349)		(44,967)
Unamortized discount, net	(90,216)		(95,718)
Amortized cost	124,219		142,599
Gross unrealized gains	88,321		77,294
Gross unrealized losses	(79)		(1,047)
CECL allowance	0	$ (13)	(388)
Carrying Value	212,461		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 allowance	0		0
Carrying Value	0		2,014
Subordinate
Debt Securities, Available-for-sale [Line Items]
Principal balance	254,784		281,284
Credit reserve	(40,349)		(44,967)
Unamortized discount, net	(90,216)		(95,718)
Amortized cost	124,219		140,599
Gross unrealized gains	88,321		77,280
Gross unrealized losses	(79)		(1,047)
CECL allowance	0		(388)
Carrying Value	$ 212,461		$ 216,444

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