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Derivative Instruments - Activity of Derivative Instruments Not Designated as Hedges (Details) - Trading - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Interest rate caps        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance $ 45,142 $ 263,142 $ 45,142 $ 550,025
Additions/ Transfers In 0 0 45,142 177,044
Terminations/Pair-Offs 0 0 (45,142) (463,927)
Ending balance 45,142 263,142 45,142 263,142
Options        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 0 80 0 0
Additions/ Transfers In 349 0 601 382
Terminations/Pair-Offs (185) (80) (437) (382)
Ending balance 164 0 164 0
TBAs        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 10,000   0  
Additions/ Transfers In 130,000   150,000  
Terminations/Pair-Offs (110,000)   (120,000)  
Ending balance 30,000   30,000  
Interest rate swaps        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 4,867,217 2,972,030 4,134,267 2,778,015
Additions/ Transfers In 1,117,681 881,235 3,373,016 1,974,659
Terminations/Pair-Offs (1,205,090) (550,952) (2,727,475) (1,450,361)
Ending balance 4,779,808 3,302,313 4,779,808 3,302,313
Credit default swaps        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 475,000 400,000 400,000 0
Additions/ Transfers In 0 0 75,000 400,000
Terminations/Pair-Offs 0 0 0 0
Ending balance 475,000 400,000 475,000 400,000
Futures        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 247,500 67,000 406,100 0
Additions/ Transfers In 1,051,727 0 1,521,127 498,950
Terminations/Pair-Offs (673,500) (67,000) (1,301,500) (498,950)
Ending balance $ 625,727 $ 0 $ 625,727 $ 0