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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
Mar. 31, 2024
Mar. 31, 2023
Interest rate caps    
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]    
Beginning balance $ 550,025  
Additions 148,044  
Terminations (161,165)  
Ending balance 536,904  
Options    
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]    
Beginning balance 0 $ 0
Additions 202 500,053
Terminations (102) 0
Ending balance 100 500,053
Interest rate swaps    
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]    
Beginning balance 2,778,015 0
Additions 904,180 341,300
Terminations (305,450) 0
Ending balance 3,376,745 $ 341,300
Credit default swaps    
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]    
Beginning balance 0  
Additions 400,000  
Terminations 0  
Ending balance 400,000  
U.S. Treasury futures    
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]    
Beginning balance 0  
Additions 280,750  
Terminations (255,450)  
Ending balance $ 25,300