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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value Option
Amortized Cost	$ 102,278	$ 154,581
Unrealized Gains	23,226	19,517
Unrealized Losses	(9,580)	(2,774)
Fair Value	115,924	171,324
CECL Securities
Amortized Cost	25,526	27,743
Unrealized Gains	0	1,787
Unrealized Losses	(944)	(10)
Fair Value	24,582	29,520
Total CECL Securities and Fair Value Option
Amortized Cost	127,804	182,324
Unrealized Gains	23,226	21,304
Unrealized Losses	(10,524)	(2,784)
Fair Value	140,506	200,844
Non-Agency RMBS
Fair Value Option
Amortized Cost	50,307	100,186
Unrealized Gains	7,009	949
Unrealized Losses	(7,076)	(2,636)
Fair Value	50,240	98,499
CECL Securities
Amortized Cost	25,526	27,743
Unrealized Gains	0	1,787
Unrealized Losses	(944)	(10)
Fair Value	24,582	29,520
CMBS
Fair Value Option
Amortized Cost	32,600	32,600
Unrealized Gains	0	684
Unrealized Losses	(2,504)	(138)
Fair Value	30,096	33,146
ABS
Fair Value Option
Amortized Cost	19,371	21,795
Unrealized Gains	16,217	17,884
Unrealized Losses	0	0
Fair Value	$ 35,588	$ 39,679

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