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Investment Securities Available For Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value Option |  |
Amortized Cost | $ 3,886,897,000 | $ 1,983,318,000
Unrealized Gains | 18,959,000 | 36,781,000
Unrealized Losses | (77,312,000) | (6,313,000)
Fair Value | 3,828,544,000 | 2,013,786,000
CECL Securities |  |
Amortized Cost | 0 | 35,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (4,000)
Fair Value | 0 | 31,000
Total CECL Securities and Fair Value Option |  |
Amortized Cost | 3,886,897,000 | 1,983,353,000
Unrealized Gains | 18,959,000 | 36,781,000
Unrealized Losses | (77,312,000) | (6,317,000)
Fair Value | 3,828,544,000 | 2,013,817,000
Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 3,163,035,000 | 1,961,221,000
Unrealized Gains | 12,861,000 | 30,135,000
Unrealized Losses | (39,084,000) | (2,032,000)
Fair Value | 3,136,812,000 | 1,989,324,000
Agency RMBS | Fixed rate |  |
Fair Value Option |  |
Amortized Cost | 2,949,038,000 | 1,761,138,000
Unrealized Gains | 11,733,000 | 21,581,000
Unrealized Losses | (21,711,000) | (1,829,000)
Fair Value | 2,939,060,000 | 1,780,890,000
Agency RMBS | Fixed rate | Fannie Mae |  |
Fair Value Option |  |
Amortized Cost | 1,483,619,000 | 1,084,702,000
Unrealized Gains | 7,819,000 | 15,902,000
Unrealized Losses | (7,991,000) | (723,000)
Fair Value | 1,483,447,000 | 1,099,881,000
Agency RMBS | Fixed rate | Freddie Mac |  |
Fair Value Option |  |
Amortized Cost | 1,465,419,000 | 676,436,000
Unrealized Gains | 3,914,000 | 5,679,000
Unrealized Losses | (13,720,000) | (1,106,000)
Fair Value | 1,455,613,000 | 681,009,000
Agency RMBS | Adjustable rate |  |
Fair Value Option |  |
Amortized Cost | 130,119,000 | 147,460,000
Unrealized Gains | 285,000 | 1,741,000
Unrealized Losses | (822,000) | 0
Fair Value | 129,582,000 | 149,201,000
Agency RMBS | Adjustable rate | Fannie Mae |  |
Fair Value Option |  |
Amortized Cost | 97,267,000 | 110,036,000
Unrealized Gains | 265,000 | 1,299,000
Unrealized Losses | (631,000) | 0
Fair Value | 96,901,000 | 111,335,000
Agency RMBS | Adjustable rate | Freddie Mac |  |
Fair Value Option |  |
Amortized Cost | 32,852,000 | 37,424,000
Unrealized Gains | 20,000 | 442,000
Unrealized Losses | (191,000) | 0
Fair Value | 32,681,000 | 37,866,000
Agency RMBS | Interest-only |  |
Fair Value Option |  |
Amortized Cost | 83,878,000 | 52,623,000
Unrealized Gains | 843,000 | 6,813,000
Unrealized Losses | (16,551,000) | (203,000)
Fair Value | 68,170,000 | 59,233,000
Agency RMBS | Interest-only | Freddie Mac |  |
Fair Value Option |  |
Amortized Cost | 5,251,000 | 0
Unrealized Gains | 0 | 0
Unrealized Losses | (459,000) | 0
Fair Value | 4,792,000 | 0
Agency RMBS | Interest-only | Ginnie Mae |  |
Fair Value Option |  |
Amortized Cost | 78,627,000 | 52,623,000
Unrealized Gains | 843,000 | 6,813,000
Unrealized Losses | (16,092,000) | (203,000)
Fair Value | 63,378,000 | 59,233,000
Non-Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 66,203,000 | 22,097,000
Unrealized Gains | 6,098,000 | 6,646,000
Unrealized Losses | (2,614,000) | (4,281,000)
Fair Value | 69,687,000 | 24,462,000
CECL Securities |  |
Amortized Cost | 0 | 35,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (4,000)
Fair Value | 0 | 31,000
U.S. Treasury securities |  |
Fair Value Option |  |
Amortized Cost | 657,659,000 | 0
Unrealized Gains | 0 | 0
Unrealized Losses | (35,614,000) | 0
Fair Value | $ 622,045,000 | $ 0

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