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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Carrying Value Less Than 12 Months	$ 269,352	$ 25,507
Gross Unrealized Losses Less Than 12 Months	(12,287)	(124)
Carrying Value Greater Than 12 Months	16,966	222,390
Gross Unrealized Losses Greater Than 12 Months	(1,337)	(7,467)
Carrying Value	286,318	247,897
Gross Unrealized Losses	(13,624)	(7,591)
Agency RMBS
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Carrying Value Less Than 12 Months		0
Gross Unrealized Losses Less Than 12 Months		0
Carrying Value Greater Than 12 Months		222,286
Gross Unrealized Losses Greater Than 12 Months		(7,454)
Carrying Value		222,286
Gross Unrealized Losses		(7,454)
Non-Agency RMBS
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Carrying Value Less Than 12 Months	235,449	0
Gross Unrealized Losses Less Than 12 Months	(11,651)	0
Carrying Value Greater Than 12 Months	16,966	104
Gross Unrealized Losses Greater Than 12 Months	(1,337)	(13)
Carrying Value	252,415	104
Gross Unrealized Losses	(12,988)	(13)
CMBS
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Carrying Value Less Than 12 Months	33,903	25,507
Gross Unrealized Losses Less Than 12 Months	(636)	(124)
Carrying Value Greater Than 12 Months	0	0
Gross Unrealized Losses Greater Than 12 Months	0	0
Carrying Value	33,903	25,507
Gross Unrealized Losses	$ (636)	$ (124)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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