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Investment Securities Available For Sale, at Fair Value - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value Option
Amortized Cost	$ 154,581	$ 412,164
Unrealized Gains	19,517	15,795
Unrealized Losses	(2,774)	(14,517)
Fair Value	171,324	413,442
CECL Securities
Amortized Cost	27,743	310,290
Unrealized Gains	1,787	6,368
Unrealized Losses	(10)	(5,374)
Fair Value	29,520	311,284
Debt securities, available-for-sale, CECL and fair value option, amortized cost	182,324	722,454
Debt securities, available-for-sale, CECL and fair value option, accumulated gross unrealized gain, before tax	21,304	22,163
Debt Securities, Available-For-Sale, CECL And Fair Value Option, Accumulated Gross Unrealized Loss, before Tax	(2,784)	(19,891)
Debt securities, available-for-sale, CECL and fair value option	200,844	724,726
Debt securities, available-for-sale, amortized cost, excluding accrued interest, before allowance for credit loss	27,743	310,290
Agency RMBS
Fair Value Option
Amortized Cost	0	138,541
Unrealized Gains	0	854
Unrealized Losses	0	0
Fair Value	0	139,395
Non-Agency RMBS
Fair Value Option
Amortized Cost	100,186	100,465
Unrealized Gains	949	170
Unrealized Losses	(2,636)	(10,786)
Fair Value	98,499	89,849
CECL Securities
Amortized Cost	27,743	266,855
Unrealized Gains	1,787	4,336
Unrealized Losses	(10)	(5,374)
Fair Value	29,520	265,817
Debt securities, available-for-sale, amortized cost, excluding accrued interest, before allowance for credit loss	27,743	266,855
Non-Agency RMBS | Non Agency RMBS Held In Securitization Trust
Fair Value Option
Fair Value		37,600
CECL Securities
Amortized Cost		71,500
Debt securities, available-for-sale, amortized cost, excluding accrued interest, before allowance for credit loss		71,500
CMBS
Fair Value Option
Amortized Cost	32,600	139,019
Unrealized Gains	684	5,685
Unrealized Losses	(138)	(3,731)
Fair Value	33,146	140,973
CECL Securities
Amortized Cost	0	43,435
Unrealized Gains	0	2,032
Unrealized Losses	0	0
Fair Value	0	45,467
Debt securities, available-for-sale, amortized cost, excluding accrued interest, before allowance for credit loss	0	43,435
ABS
Fair Value Option
Amortized Cost	21,795	34,139
Unrealized Gains	17,884	9,086
Unrealized Losses	0	0
Fair Value	$ 39,679	$ 43,225

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