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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, 2023	Dec. 31, 2022
Fair Value Option
Amortized Cost	$ 1,622,345	$ 81,788
Unrealized Gains	8,900	9,495
Unrealized Losses	(52,966)	(15,369)
Fair Value	1,578,279	75,914
CECL Securities
Amortized Cost	25,763	25,616
Unrealized Gains	0	0
Unrealized Losses	(1,827)	(1,971)
Fair Value	23,936	23,645
Total CECL Securities and Fair Value Option
Amortized Cost	1,648,108	107,404
Unrealized Gains	8,900	9,495
Unrealized Losses	(54,793)	(17,340)
Fair Value	1,602,215	99,559
Agency RMBS
Fair Value Option
Amortized Cost	1,574,286	0
Unrealized Gains	171	0
Unrealized Losses	(39,453)	0
Fair Value	1,535,004	0
Agency RMBS | Fixed rate
Fair Value Option
Amortized Cost	1,459,901	0
Unrealized Gains	64	0
Unrealized Losses	(37,170)	0
Fair Value	1,422,795	0
Agency RMBS | Fixed rate | Fannie Mae
Fair Value Option
Amortized Cost	868,656	0
Unrealized Gains	64	0
Unrealized Losses	(18,193)	0
Fair Value	850,527	0
Agency RMBS | Fixed rate | Freddie Mac
Fair Value Option
Amortized Cost	591,245	0
Unrealized Gains	0	0
Unrealized Losses	(18,977)	0
Fair Value	572,268	0
Agency RMBS | Adjustable rate
Fair Value Option
Amortized Cost	72,180	0
Unrealized Gains	0	0
Unrealized Losses	(1,558)	0
Fair Value	70,622	0
Agency RMBS | Adjustable rate | Fannie Mae
Fair Value Option
Amortized Cost	43,377	0
Unrealized Gains	0	0
Unrealized Losses	(1,036)	0
Fair Value	42,341	0
Agency RMBS | Adjustable rate | Freddie Mac
Fair Value Option
Amortized Cost	28,803	0
Unrealized Gains	0	0
Unrealized Losses	(522)	0
Fair Value	28,281	0
Agency RMBS | Interest-only
Fair Value Option
Amortized Cost	42,205	0
Unrealized Gains	107	0
Unrealized Losses	(725)	0
Fair Value	41,587	0
Agency RMBS | Interest-only | Ginnie Mae
Fair Value Option
Amortized Cost	42,205	0
Unrealized Gains	107	0
Unrealized Losses	(725)	0
Fair Value	41,587	0
Non-Agency RMBS
Fair Value Option
Amortized Cost	42,059	48,958
Unrealized Gains	8,729	9,436
Unrealized Losses	(13,161)	(13,469)
Fair Value	37,627	44,925
CECL Securities
Amortized Cost	25,763	25,616
Unrealized Gains	0	0
Unrealized Losses	(1,827)	(1,971)
Fair Value	23,936	23,645
CMBS
Fair Value Option
Amortized Cost	6,000	32,033
Unrealized Gains	0	0
Unrealized Losses	(352)	(1,900)
Fair Value	5,648	30,133
ABS
Fair Value Option
Amortized Cost	0	797
Unrealized Gains	0	59
Unrealized Losses	0	0
Fair Value	$ 0	$ 856

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