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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Interest rate caps        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance $ 536,904   $ 550,025  
Additions/Transfers In 29,000   177,044  
Terminations/Transfers Out (302,762)   (463,927)  
Ending balance 263,142   263,142  
Options        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 100 $ 500,053 0 $ 0
Additions/Transfers In 180 95 382 500,148
Terminations/Transfers Out (200) (500,067) (302) (500,067)
Ending balance 80 81 80 81
Interest rate swaps        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 3,376,745 341,300 2,778,015 0
Additions/Transfers In 189,244 559,625 1,093,424 900,925
Terminations/Transfers Out (593,959) 0 (899,409) 0
Ending balance 2,972,030 $ 900,925 2,972,030 $ 900,925
Credit default swaps        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 400,000   0  
Additions/Transfers In 0   400,000  
Terminations/Transfers Out 0   0  
Ending balance 400,000   400,000  
U.S. Treasury futures        
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]        
Beginning balance 25,300   0  
Additions/Transfers In 218,200   498,950  
Terminations/Transfers Out (176,500)   (431,950)  
Ending balance $ 67,000   $ 67,000