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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, 2024	Dec. 31, 2023
Fair Value Option
Amortized Cost	$ 2,689,490	$ 1,983,318
Unrealized Gains	16,614	36,781
Unrealized Losses	(34,025)	(6,313)
Fair Value	2,672,079	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	2,689,490	1,983,353
Unrealized Gains	16,614	36,781
Unrealized Losses	(34,025)	(6,317)
Fair Value	2,672,079	2,013,817
Agency RMBS
Fair Value Option
Amortized Cost	2,634,169	1,961,221
Unrealized Gains	10,368	30,135
Unrealized Losses	(30,695)	(2,032)
Fair Value	2,613,842	1,989,324
Agency RMBS | Fixed rate
Fair Value Option
Amortized Cost	2,424,931	1,761,138
Unrealized Gains	9,385	21,581
Unrealized Losses	(15,992)	(1,829)
Fair Value	2,418,324	1,780,890
Agency RMBS | Fixed rate | Fannie Mae
Fair Value Option
Amortized Cost	1,367,506	1,084,702
Unrealized Gains	6,675	15,902
Unrealized Losses	(6,053)	(723)
Fair Value	1,368,128	1,099,881
Agency RMBS | Fixed rate | Freddie Mac
Fair Value Option
Amortized Cost	1,057,425	676,436
Unrealized Gains	2,710	5,679
Unrealized Losses	(9,939)	(1,106)
Fair Value	1,050,196	681,009
Agency RMBS | Adjustable rate
Fair Value Option
Amortized Cost	141,395	147,460
Unrealized Gains	983	1,741
Unrealized Losses	(7)	0
Fair Value	142,371	149,201
Agency RMBS | Adjustable rate | Fannie Mae
Fair Value Option
Amortized Cost	104,818	110,036
Unrealized Gains	770	1,299
Unrealized Losses	(7)	0
Fair Value	105,581	111,335
Agency RMBS | Adjustable rate | Freddie Mac
Fair Value Option
Amortized Cost	36,577	37,424
Unrealized Gains	213	442
Unrealized Losses	0	0
Fair Value	36,790	37,866
Agency RMBS | Interest-only
Fair Value Option
Amortized Cost	67,843	52,623
Unrealized Gains	0	6,813
Unrealized Losses	(14,696)	(203)
Fair Value	53,147	59,233
Agency RMBS | Interest-only | Freddie Mac
Fair Value Option
Amortized Cost	5,791	0
Unrealized Gains	0	0
Unrealized Losses	(544)	0
Fair Value	5,247	0
Agency RMBS | Interest-only | Ginnie Mae
Fair Value Option
Amortized Cost	62,052	52,623
Unrealized Gains	0	6,813
Unrealized Losses	(14,152)	(203)
Fair Value	47,900	59,233
Non-Agency RMBS
Fair Value Option
Amortized Cost	55,321	22,097
Unrealized Gains	6,246	6,646
Unrealized Losses	(3,330)	(4,281)
Fair Value	58,237	24,462
CECL Securities
Amortized Cost	0	35
Unrealized Gains	0	0
Unrealized Losses	0	(4)
Fair Value	$ 0	$ 31

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