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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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