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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value Option
Amortized Cost	$ 294,720	$ 412,164
Unrealized Gains	19,449	15,795
Unrealized Losses	(6,673)	(14,517)
Fair Value	307,496	413,442
CECL Securities
Amortized Cost	138,555	310,290
Unrealized Gains	2,482	6,368
Unrealized Losses	(440)	(5,374)
Fair Value	140,597	311,284
Total CECL Securities and Fair Value Option
Amortized Cost	433,275	722,454
Unrealized Gains	21,931	22,163
Unrealized Losses	(7,113)	(19,891)
Fair Value	448,093	724,726
Agency RMBS
Fair Value Option
Amortized Cost	129,198	138,541
Unrealized Gains	0	854
Unrealized Losses	(3,609)	0
Fair Value	125,589	139,395
Non-Agency RMBS
Fair Value Option
Amortized Cost	108,579	100,465
Unrealized Gains	1,168	170
Unrealized Losses	(3,064)	(10,786)
Fair Value	106,683	89,849
CECL Securities
Amortized Cost	115,686	266,855
Unrealized Gains	2,482	4,336
Unrealized Losses	(75)	(5,374)
Fair Value	118,093	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	32,600	139,019
Unrealized Gains	1,139	5,685
Unrealized Losses	0	(3,731)
Fair Value	33,739	140,973
CECL Securities
Amortized Cost	22,869	43,435
Unrealized Gains	0	2,032
Unrealized Losses	(365)	0
Fair Value	22,504	45,467
ABS
Fair Value Option
Amortized Cost	24,343	34,139
Unrealized Gains	17,142	9,086
Unrealized Losses	0	0
Fair Value	$ 41,485	$ 43,225

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