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Investment Securities Available For Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value Option |  |
Amortized Cost | $ 1,983,318 | $ 81,788
Unrealized Gains | 36,781 | 9,495
Unrealized Losses | (6,313) | (15,369)
Fair Value | 2,013,786 | 75,914
CECL Securities |  |
Amortized Cost | 35 | 25,616
Unrealized Gains | 0 | 0
Unrealized Losses | (4) | (1,971)
Fair Value | 31 | 23,645
Amortized Cost |  |
Amortized Cost | 1,983,353 | 107,404
Unrealized Gains | 36,781 | 9,495
Unrealized Losses | (6,317) | (17,340)
Fair Value | 2,013,817 | 99,559
Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 1,961,221 | 0
Unrealized Gains | 30,135 | 0
Unrealized Losses | (2,032) | 0
Fair Value | 1,989,324 | 0
Agency RMBS | Fixed rate |  |
Fair Value Option |  |
Amortized Cost | 1,761,138 | 0
Unrealized Gains | 21,581 | 0
Unrealized Losses | (1,829) | 0
Fair Value | 1,780,890 | 0
Agency RMBS | Fixed rate | Fannie Mae |  |
Fair Value Option |  |
Amortized Cost | 1,084,702 | 0
Unrealized Gains | 15,902 | 0
Unrealized Losses | (723) | 0
Fair Value | 1,099,881 | 0
Agency RMBS | Fixed rate | Freddie Mac |  |
Fair Value Option |  |
Amortized Cost | 676,436 | 0
Unrealized Gains | 5,679 | 0
Unrealized Losses | (1,106) | 0
Fair Value | 681,009 | 0
Agency RMBS | Adjustable rate |  |
Fair Value Option |  |
Amortized Cost | 147,460 | 0
Unrealized Gains | 1,741 | 0
Unrealized Losses | 0 | 0
Fair Value | 149,201 | 0
Agency RMBS | Adjustable rate | Fannie Mae |  |
Fair Value Option |  |
Amortized Cost | 110,036 | 0
Unrealized Gains | 1,299 | 0
Unrealized Losses | 0 | 0
Fair Value | 111,335 | 0
Agency RMBS | Adjustable rate | Freddie Mac |  |
Fair Value Option |  |
Amortized Cost | 37,424 | 0
Unrealized Gains | 442 | 0
Unrealized Losses | 0 | 0
Fair Value | 37,866 | 0
Agency RMBS | Interest-only |  |
Fair Value Option |  |
Amortized Cost | 52,623 | 0
Unrealized Gains | 6,813 | 0
Unrealized Losses | (203) | 0
Fair Value | 59,233 | 0
Agency RMBS | Interest-only | Ginnie Mae |  |
Fair Value Option |  |
Amortized Cost | 52,623 | 0
Unrealized Gains | 6,813 | 0
Unrealized Losses | (203) | 0
Fair Value | 59,233 | 0
Non-Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 22,097 | 48,958
Unrealized Gains | 6,646 | 9,436
Unrealized Losses | (4,281) | (13,469)
Fair Value | 24,462 | 44,925
CECL Securities |  |
Amortized Cost | 35 | 25,616
Unrealized Gains | 0 | 0
Unrealized Losses | (4) | (1,971)
Fair Value | 31 | 23,645
CMBS |  |
Fair Value Option |  |
Amortized Cost | 0 | 32,033
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (1,900)
Fair Value | 0 | 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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