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Investment Securities Available For Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Fair Value Option    
Amortized Cost $ 3,344,430,000 $ 1,983,318,000
Unrealized Gains 61,269,000 36,781,000
Unrealized Losses (20,429,000) (6,313,000)
Fair Value 3,385,270,000 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 3,344,430,000 1,983,353,000
Unrealized Gains 61,269,000 36,781,000
Unrealized Losses (20,429,000) (6,317,000)
Fair Value 3,385,270,000 2,013,817,000
Agency RMBS    
Fair Value Option    
Amortized Cost 2,926,603,000 1,961,221,000
Unrealized Gains 54,537,000 30,135,000
Unrealized Losses (13,174,000) (2,032,000)
Fair Value 2,967,966,000 1,989,324,000
Agency RMBS | Fixed rate    
Fair Value Option    
Amortized Cost 2,705,816,000 1,761,138,000
Unrealized Gains 49,119,000 21,581,000
Unrealized Losses (215,000) (1,829,000)
Fair Value 2,754,720,000 1,780,890,000
Agency RMBS | Fixed rate | Fannie Mae    
Fair Value Option    
Amortized Cost 1,401,283,000 1,084,702,000
Unrealized Gains 28,596,000 15,902,000
Unrealized Losses (185,000) (723,000)
Fair Value 1,429,694,000 1,099,881,000
Agency RMBS | Fixed rate | Freddie Mac    
Fair Value Option    
Amortized Cost 1,304,533,000 676,436,000
Unrealized Gains 20,523,000 5,679,000
Unrealized Losses (30,000) (1,106,000)
Fair Value 1,325,026,000 681,009,000
Agency RMBS | Adjustable rate    
Fair Value Option    
Amortized Cost 135,430,000 147,460,000
Unrealized Gains 2,892,000 1,741,000
Unrealized Losses 0 0
Fair Value 138,322,000 149,201,000
Agency RMBS | Adjustable rate | Fannie Mae    
Fair Value Option    
Amortized Cost 100,537,000 110,036,000
Unrealized Gains 2,224,000 1,299,000
Unrealized Losses 0 0
Fair Value 102,761,000 111,335,000
Agency RMBS | Adjustable rate | Freddie Mac    
Fair Value Option    
Amortized Cost 34,893,000 37,424,000
Unrealized Gains 668,000 442,000
Unrealized Losses 0 0
Fair Value 35,561,000 37,866,000
Agency RMBS | Interest-only    
Fair Value Option    
Amortized Cost 85,357,000 52,623,000
Unrealized Gains 2,526,000 6,813,000
Unrealized Losses (12,959,000) (203,000)
Fair Value 74,924,000 59,233,000
Agency RMBS | Interest-only | Freddie Mac    
Fair Value Option    
Amortized Cost 5,511,000 0
Unrealized Gains 0 0
Unrealized Losses (1,554,000) 0
Fair Value 3,957,000 0
Agency RMBS | Interest-only | Ginnie Mae    
Fair Value Option    
Amortized Cost 79,846,000 52,623,000
Unrealized Gains 2,526,000 6,813,000
Unrealized Losses (11,405,000) (203,000)
Fair Value 70,967,000 59,233,000
Non-Agency RMBS    
Fair Value Option    
Amortized Cost 64,998,000 22,097,000
Unrealized Gains 6,054,000 6,646,000
Unrealized Losses (2,836,000) (4,281,000)
Fair Value 68,216,000 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 352,829,000 0
Unrealized Gains 678,000 0
Unrealized Losses (4,419,000) 0
Fair Value $ 349,088,000 $ 0