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Investment Securities Available For Sale, at Fair Value - Schedule of Realized Gain or Loss Activity (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Sales Proceeds $ 663,336,000 $ 0
Realized Gains 3,752,000  
Realized Losses (30,570,000)  
Net Realized Gains (Losses) (26,818,000)  
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Sales Proceeds 658,763,000  
Realized Gains 3,700,000  
Realized Losses (30,570,000)  
Net Realized Gains (Losses) (26,870,000)  
Non-Agency RMBS    
Debt Securities, Available-for-sale [Line Items]    
Sales Proceeds 4,573,000  
Realized Gains 52,000  
Realized Losses 0  
Net Realized Gains (Losses) $ 52,000 $ (400,000)