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Investment Securities Available For Sale, at Fair Value - Unrealized Losses in OCI (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Carrying Value	$ 159,841	$ 25,507
Less than 12 Months, Gross Unrealized Losses	(4,526)	(124)
Greater than 12 Months, Carrying Value	8,234	222,390
Greater than 12 Months, Gross Unrealized Losses	(848)	(7,467)
Total, Carrying Value	168,075	247,897
Total, Gross Unrealized Losses	(5,374)	(7,591)
Agency RMBs
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Carrying Value		0
Less than 12 Months, Gross Unrealized Losses		0
Greater than 12 Months, Carrying Value		222,286
Greater than 12 Months, Gross Unrealized Losses		(7,454)
Total, Carrying Value		222,286
Total, Gross Unrealized Losses		(7,454)
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Carrying Value	159,841	0
Less than 12 Months, Gross Unrealized Losses	(4,526)	0
Greater than 12 Months, Carrying Value	8,234	104
Greater than 12 Months, Gross Unrealized Losses	(848)	(13)
Total, Carrying Value	168,075	104
Total, Gross Unrealized Losses	$ (5,374)	(13)
CMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Carrying Value		25,507
Less than 12 Months, Gross Unrealized Losses		(124)
Greater than 12 Months, Carrying Value		0
Greater than 12 Months, Gross Unrealized Losses		0
Total, Carrying Value		25,507
Total, Gross Unrealized Losses		$ (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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