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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, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, Carrying Value	$ 58,036	$ 159,841
Less Than 12 months, Gross Unrealized Losses	(387)	(4,526)
Greater Than 12 months, Carrying Value	36,739	8,234
Greater Than 12 months, Gross Unrealized Losses	(53)	(848)
Total, Carrying Value	94,775	168,075
Total Gross Unrealized Losses	(440)	(5,374)
Non-Agency RMBS
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, Carrying Value	35,532	159,841
Less Than 12 months, Gross Unrealized Losses	(22)	(4,526)
Greater Than 12 months, Carrying Value	36,739	8,234
Greater Than 12 months, Gross Unrealized Losses	(53)	(848)
Total, Carrying Value	72,271	168,075
Total Gross Unrealized Losses	(75)	$ (5,374)
CMBS
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, Carrying Value	22,504
Less Than 12 months, Gross Unrealized Losses	(365)
Greater Than 12 months, Carrying Value	0
Greater Than 12 months, Gross Unrealized Losses	0
Total, Carrying Value	22,504
Total Gross Unrealized Losses	$ (365)

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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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