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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	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020	Mar. 31, 2020
Fair Value Option
Amortized Cost		$ 374,734	$ 412,164
Unrealized Gains	$ 15,795	19,533
Unrealized Losses	(14,517)	(12,127)
Fair Value		382,140	413,442
CECL Securities
Amortized Cost		217,818	310,290
Unrealized Gains		8,476	6,368
Unrealized Losses		(1,027)	(5,374)
Fair Value		225,267	311,284
Total CECL Securities and Fair Value Option
Amortized Cost		592,552	722,454
Unrealized Gains		28,009	22,163
Unrealized Losses		(13,154)	(19,891)
Fair Value		607,407	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		134,461	138,541
Unrealized Gains	854	0
Unrealized Losses	0	(3,162)
Fair Value		131,299	139,395
Non-Agency RMBS
Fair Value Option
Amortized Cost		100,379	100,465
Unrealized Gains	170	674
Unrealized Losses	(10,786)	(8,560)
Fair Value		92,493	89,849
CECL Securities
Amortized Cost		189,398	266,855
Unrealized Gains		6,742	4,336
Unrealized Losses		(645)	(5,374)
Fair Value		195,495	265,817
Non-Agency RMBS | Non Agency RMBS Held In Securitization Trust
Fair Value Option
Fair Value			37,600
CECL Securities
Amortized Cost			71,500
CMBS
Fair Value Option
Amortized Cost		111,977	139,019
Unrealized Gains	5,685	4,156
Unrealized Losses	(3,731)	(405)
Fair Value		115,728	140,973
CECL Securities
Amortized Cost		28,420	43,435
Unrealized Gains		1,734	2,032
Unrealized Losses		(382)	0
Fair Value		29,772	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		72,600	97,600
ABS
Fair Value Option
Amortized Cost		27,917	34,139
Unrealized Gains	9,086	14,703
Unrealized Losses	$ 0	0
Fair Value		$ 42,620	$ 43,225

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