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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, 2023	Dec. 31, 2022
Fair Value Option
Amortized Cost	$ 723,851	$ 81,788
Unrealized Gains	8,847	9,495
Unrealized Losses	(22,377)	(15,369)
Fair Value	710,321	75,914
CECL Securities
Amortized Cost	25,713	25,616
Unrealized Gains	0	0
Unrealized Losses	(1,762)	(1,971)
Fair Value	23,951	23,645
Total CECL Securities and Fair Value Option
Amortized Cost	749,564	107,404
Unrealized Gains	8,847	9,495
Unrealized Losses	(24,139)	(17,340)
Fair Value	734,272	99,559
Agency RMBS
Fair Value Option
Amortized Cost	648,027	0
Unrealized Gains	0	0
Unrealized Losses	(7,894)	0
Fair Value	640,133	0
Non-Agency RMBS
Fair Value Option
Amortized Cost	43,808	48,958
Unrealized Gains	8,847	9,436
Unrealized Losses	(12,864)	(13,469)
Fair Value	39,791	44,925
CECL Securities
Amortized Cost	25,713	25,616
Unrealized Gains	0	0
Unrealized Losses	(1,762)	(1,971)
Fair Value	23,951	23,645
CMBS
Fair Value Option
Amortized Cost	32,016	32,033
Unrealized Gains	0	0
Unrealized Losses	(1,619)	(1,900)
Fair Value	30,397	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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