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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, 2019	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Carrying Value	$ 271,641		$ 333,882
Residential
Debt Securities, Available-for-sale [Line Items]
Principal balance	339,208		431,112
Credit reserve	(34,211)	$ (34,849)	(41,370)
Unamortized discount, net	(132,654)	$ (137,282)	(151,200)
Amortized cost	172,343		238,542
Gross unrealized gains	99,310		95,888
Gross unrealized losses	(12)		(548)
Carrying Value	271,641		333,882
Residential | Senior
Debt Securities, Available-for-sale [Line Items]
Principal balance	34,272		91,736
Credit reserve	(588)		(7,790)
Unamortized discount, net	(12,346)		(18,460)
Amortized cost	21,338		65,486
Gross unrealized gains	12,131		22,178
Gross unrealized losses	(12)		(49)
Carrying Value	33,457		87,615
Residential | Mezzanine
Debt Securities, Available-for-sale [Line Items]
Principal balance	13,729		36,852
Credit reserve	0		0
Unamortized discount, net	(552)		(3,697)
Amortized cost	13,177		33,155
Gross unrealized gains	790		3,252
Gross unrealized losses	0		0
Carrying Value	13,967		36,407
Residential | Subordinate
Debt Securities, Available-for-sale [Line Items]
Principal balance	291,207		302,524
Credit reserve	(33,623)		(33,580)
Unamortized discount, net	(119,756)		(129,043)
Amortized cost	137,828		139,901
Gross unrealized gains	86,389		70,458
Gross unrealized losses	0		(499)
Carrying Value	$ 224,217		$ 209,860

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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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