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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value Option
Amortized Cost	$ 108,590	$ 154,581
Unrealized Gains	19,171	19,517
Unrealized Losses	(7,054)	(2,774)
Fair Value	120,707	171,324
CECL Securities
Amortized Cost	25,483	27,743
Unrealized Gains	202	1,787
Unrealized Losses	(612)	(10)
Fair Value	25,073	29,520
Total CECL Securities and Fair Value Option
Amortized Cost	134,073	182,324
Unrealized Gains	19,373	21,304
Unrealized Losses	(7,666)	(2,784)
Fair Value	145,780	200,844
Non-Agency RMBS
Fair Value Option
Amortized Cost	55,151	100,186
Unrealized Gains	1,275	949
Unrealized Losses	(6,000)	(2,636)
Fair Value	50,426	98,499
CECL Securities
Amortized Cost	25,483	27,743
Unrealized Gains	202	1,787
Unrealized Losses	(612)	(10)
Fair Value	25,073	29,520
CMBS
Fair Value Option
Amortized Cost	32,600	32,600
Unrealized Gains	30	684
Unrealized Losses	(1,054)	(138)
Fair Value	31,576	33,146
ABS
Fair Value Option
Amortized Cost	20,839	21,795
Unrealized Gains	17,866	17,884
Unrealized Losses	0	0
Fair Value	$ 38,705	$ 39,679

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