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Derivative Instruments and Hedging Activities - Activity of Derivative Instruments Not Designated as Hedges (Details) - Trading - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Interest rate caps        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance $ 263,142   $ 550,025  
Additions 0   177,044  
Terminations 0   (463,927)  
Ending balance 263,142   263,142  
Options        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 80 $ 81 0 $ 0
Additions 0 0 382 500,148
Terminations (80) (81) (382) (500,148)
Ending balance 0 0 0 0
Interest rate swaps        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 2,972,030 900,925 2,778,015 0
Additions 881,235 1,356,309 1,974,659 2,257,234
Terminations (550,952) 0 (1,450,361) 0
Ending balance 3,302,313 $ 2,257,234 3,302,313 $ 2,257,234
Credit default swaps        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 400,000   0  
Additions 0   400,000  
Terminations 0   0  
Ending balance 400,000   400,000  
U.S. Treasury futures        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 67,000   0  
Additions 0   498,950  
Terminations (67,000)   (498,950)  
Ending balance $ 0   $ 0