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Investment Securities Available For Sale, at Fair Value - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Fair Value Option
Amortized Cost	$ 412,164	$ 244,735
Unrealized Gains	15,795	2,998
Unrealized Losses	(14,517)	(2,405)
Fair Value	413,442	245,328
CECL Securities
Amortized Cost	310,290	1,735,680
Unrealized Gains	6,368	32,723
Unrealized Losses	(5,374)	(7,591)
Fair Value	311,284	1,760,812
Debt securities, available-for-sale, CECL and fair value option, amortized cost	722,454	1,980,415
Debt securities, available-for-sale, CECL and fair value option, accumulated gross unrealized gain, before tax	22,163	35,721
Debt Securities, Available-For-Sale, CECL And Fair Value Option, Accumulated Gross Unrealized Loss, before Tax	(19,891)	(9,996)
Debt securities, available-for-sale, CECL and fair value option	724,726	$ 2,006,140
Consolidated K-Series | VIE, Primary Beneficiary
CECL Securities
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation			$ 237,300
Agency ARMs
CECL Securities
Weighted average reset period		26 months
Agency RMBS:
Fair Value Option
Amortized Cost	138,541	$ 21,033
Unrealized Gains	854	0
Unrealized Losses	0	(55)
Fair Value	139,395	20,978
CECL Securities
Amortized Cost	0	901,943
Unrealized Gains	0	7,410
Unrealized Losses	0	(7,454)
Fair Value	0	901,899
Agency RMBS: | Agency ARMs
CECL Securities
Amortized Cost	0	55,740
Unrealized Gains	0	13
Unrealized Losses	0	(1,347)
Fair Value	0	54,406
Agency RMBS: | Agency Fixed-Rate
Fair Value Option
Amortized Cost	138,541	21,033
Unrealized Gains	854	0
Unrealized Losses	0	(55)
Fair Value	139,395	20,978
CECL Securities
Amortized Cost	0	846,203
Unrealized Gains	0	7,397
Unrealized Losses	0	(6,107)
Fair Value	0	847,493
Agency CMBS
Fair Value Option
Amortized Cost	0	31,076
Unrealized Gains	0	0
Unrealized Losses	0	(395)
Fair Value	0	30,681
CECL Securities
Amortized Cost	0	20,258
Unrealized Gains	0	19
Unrealized Losses	0	0
Fair Value	0	20,277
Total Agency
Fair Value Option
Amortized Cost	138,541	52,109
Unrealized Gains	854	0
Unrealized Losses	0	(450)
Fair Value	139,395	51,659
CECL Securities
Amortized Cost	0	922,201
Unrealized Gains	0	7,429
Unrealized Losses	0	(7,454)
Fair Value	0	922,176
Non-Agency RMBS
Fair Value Option
Amortized Cost	100,465	122,628
Unrealized Gains	170	2,435
Unrealized Losses	(10,786)	(1,248)
Fair Value	89,849	123,815
CECL Securities
Amortized Cost	266,855	578,955
Unrealized Gains	4,336	12,557
Unrealized Losses	(5,374)	(13)
Fair Value	265,817	591,499
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	139,019	20,096
Unrealized Gains	5,685	563
Unrealized Losses	(3,731)	(19)
Fair Value	140,973	20,640
CECL Securities
Amortized Cost	43,435	234,524
Unrealized Gains	2,032	12,737
Unrealized Losses	0	(124)
Fair Value	45,467	247,137
CMBS | Consolidated K-Series | VIE, Primary Beneficiary
CECL Securities
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation	97,600
ABS
Fair Value Option
Amortized Cost	34,139	49,902
Unrealized Gains	9,086	0
Unrealized Losses	0	(688)
Fair Value	$ 43,225	$ 49,214

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