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Investment Securities Available for Sale - Schedule of Investment Securities Available for Sale in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Carrying Value Less Than 12 Months	$ 46,741	$ 573,470
Gross Unrealized Losses Less Than 12 Months	(332)	(9,864)
Carrying Value Greater Than 12 Months	291,919	726,186
Gross Unrealized Losses Greater Than 12 Months	(7,991)	(30,262)
Carrying Value	338,660	1,299,656
Gross Unrealized Losses	(8,323)	(40,126)
Agency RMBS
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Carrying Value Less Than 12 Months	0	310,783
Gross Unrealized Losses Less Than 12 Months	0	(8,037)
Carrying Value Greater Than 12 Months	291,801	726,028
Gross Unrealized Losses Greater Than 12 Months	(7,977)	(30,247)
Carrying Value	291,801	1,036,811
Gross Unrealized Losses	(7,977)	(38,284)
Non-Agency RMBS
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Carrying Value Less Than 12 Months	15,430	187,395
Gross Unrealized Losses Less Than 12 Months	(178)	(1,451)
Carrying Value Greater Than 12 Months	118	158
Gross Unrealized Losses Greater Than 12 Months	(14)	(15)
Carrying Value	15,548	187,553
Gross Unrealized Losses	(192)	(1,466)
CMBS
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Carrying Value Less Than 12 Months	31,311	75,292
Gross Unrealized Losses Less Than 12 Months	(154)	(376)
Carrying Value Greater Than 12 Months	0	0
Gross Unrealized Losses Greater Than 12 Months	0	0
Carrying Value	31,311	75,292
Gross Unrealized Losses	$ (154)	$ (376)

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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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Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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