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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, 2024	Dec. 31, 2023
Fair Value Option
Amortized Cost	$ 2,244,116	$ 1,983,318
Unrealized Gains	22,574	36,781
Unrealized Losses	(25,350)	(6,313)
Fair Value	2,241,340	2,013,786
CECL Securities
Amortized Cost	0	35
Unrealized Gains	0	0
Unrealized Losses	0	(4)
Fair Value	0	31
Total CECL Securities and Fair Value Option
Amortized Cost	2,244,116	1,983,353
Unrealized Gains	22,574	36,781
Unrealized Losses	(25,350)	(6,317)
Fair Value	2,241,340	2,013,817
Agency RMBS
Fair Value Option
Amortized Cost	2,222,669	1,961,221
Unrealized Gains	16,131	30,135
Unrealized Losses	(21,315)	(2,032)
Fair Value		1,989,324
CECL Securities
Fair Value	2,217,485
Agency RMBS | Fixed rate
Fair Value Option
Amortized Cost	2,015,078	1,761,138
Unrealized Gains	14,390	21,581
Unrealized Losses	(6,812)	(1,829)
Fair Value	2,022,656	1,780,890
Agency RMBS | Fixed rate | Fannie Mae
Fair Value Option
Amortized Cost	1,152,811	1,084,702
Unrealized Gains	10,475	15,902
Unrealized Losses	(2,349)	(723)
Fair Value	1,160,937	1,099,881
Agency RMBS | Fixed rate | Freddie Mac
Fair Value Option
Amortized Cost	862,267	676,436
Unrealized Gains	3,915	5,679
Unrealized Losses	(4,463)	(1,106)
Fair Value	861,719	681,009
Agency RMBS | Adjustable rate
Fair Value Option
Amortized Cost	145,369	147,460
Unrealized Gains	1,741	1,741
Unrealized Losses	0	0
Fair Value	147,110	149,201
Agency RMBS | Adjustable rate | Fannie Mae
Fair Value Option
Amortized Cost	108,212	110,036
Unrealized Gains	1,301	1,299
Unrealized Losses	0	0
Fair Value	109,513	111,335
Agency RMBS | Adjustable rate | Freddie Mac
Fair Value Option
Amortized Cost	37,157	37,424
Unrealized Gains	440	442
Unrealized Losses	0	0
Fair Value	37,597	37,866
Agency RMBS | Interest-only
Fair Value Option
Amortized Cost	62,222	52,623
Unrealized Gains	0	6,813
Unrealized Losses	(14,503)	(203)
Fair Value	47,719	59,233
Agency RMBS | Interest-only | Ginnie Mae
Fair Value Option
Amortized Cost	62,222	52,623
Unrealized Gains	0	6,813
Unrealized Losses	(14,503)	(203)
Fair Value	47,719	59,233
Non-Agency RMBS
Fair Value Option
Amortized Cost	21,447	22,097
Unrealized Gains	6,443	6,646
Unrealized Losses	(4,035)	(4,281)
Fair Value	23,855	24,462
CECL Securities
Amortized Cost	0	35
Unrealized Gains	0	0
Unrealized Losses	0	(4)
Fair Value	$ 0	$ 31

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