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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Fair Value Option
Amortized Cost	$ 364,268	$ 412,164
Unrealized Gains	15,022	15,795
Unrealized Losses	(15,585)	(14,517)
Fair Value	363,705	413,442
CECL Securities
Amortized Cost	228,716	310,290
Unrealized Gains	5,138	6,368
Unrealized Losses	(1,264)	(5,374)
Fair Value	232,590	311,284
Total CECL Securities and Fair Value Option
Amortized Cost	592,984	722,454
Unrealized Gains	20,160	22,163
Unrealized Losses	(16,849)	(19,891)
Fair Value	596,295	724,726
Consolidated K-Series | VIE, Primary Beneficiary
Total CECL Securities and Fair Value Option
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation			$ 237,300
Agency RMBS
Fair Value Option
Amortized Cost	136,491	138,541
Unrealized Gains	0	854
Unrealized Losses	(4,866)	0
Fair Value	131,625	139,395
Non-Agency RMBS
Fair Value Option
Amortized Cost	81,451	100,465
Unrealized Gains	425	170
Unrealized Losses	(10,043)	(10,786)
Fair Value	71,833	89,849
CECL Securities
Amortized Cost	196,933	266,855
Unrealized Gains	3,708	4,336
Unrealized Losses	(867)	(5,374)
Fair Value	199,774	265,817
Non-Agency RMBS | Non Agency RMBS Held In Securitization Trust
Fair Value Option
Fair Value		37,600
CECL Securities
Fair Value		71,500
CMBS
Fair Value Option
Amortized Cost	114,177	139,019
Unrealized Gains	2,124	5,685
Unrealized Losses	(676)	(3,731)
Fair Value	115,625	140,973
CECL Securities
Amortized Cost	31,783	43,435
Unrealized Gains	1,430	2,032
Unrealized Losses	(397)	0
Fair Value	32,816	45,467
CMBS | Consolidated K-Series | VIE, Primary Beneficiary
Total CECL Securities and Fair Value Option
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation	74,000	97,600
ABS
Fair Value Option
Amortized Cost	32,149	34,139
Unrealized Gains	12,473	9,086
Unrealized Losses	0	0
Fair Value	$ 44,622	$ 43,225

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