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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, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Carrying Value	$ 287,928	$ 333,882
Senior
Debt Securities, Available-for-sale [Line Items]
Carrying Value	47,755	87,615
Residential
Debt Securities, Available-for-sale [Line Items]
Principal balance	372,209	431,112
Credit reserve	(34,834)	(41,370)
Unamortized discount, net	(142,013)	(151,200)
Amortized cost	195,362	238,542
Gross unrealized gains	92,640	95,888
Gross unrealized losses	(74)	(548)
Carrying Value	287,928	333,882
Residential | Senior
Debt Securities, Available-for-sale [Line Items]
Principal balance	48,527	91,736
Credit reserve	(1,382)	(7,790)
Unamortized discount, net	(15,853)	(18,460)
Amortized cost	31,292	65,486
Gross unrealized gains	16,495	22,178
Gross unrealized losses	(32)	(49)
Carrying Value	47,755	87,615
Residential | Mezzanine
Debt Securities, Available-for-sale [Line Items]
Principal balance	31,002	36,852
Credit reserve	0	0
Unamortized discount, net	(3,280)	(3,697)
Amortized cost	27,722	33,155
Gross unrealized gains	3,411	3,252
Gross unrealized losses	0	0
Carrying Value	31,133	36,407
Residential | Subordinate Securities
Debt Securities, Available-for-sale [Line Items]
Principal balance	292,680	302,524
Credit reserve	(33,452)	(33,580)
Unamortized discount, net	(122,880)	(129,043)
Amortized cost	136,348	139,901
Gross unrealized gains	72,734	70,458
Gross unrealized losses	(42)	(499)
Carrying Value	$ 209,040	$ 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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