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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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