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Investments in Securities - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]            
Debt securities $ 8,288,311,000     $ 8,288,311,000   $ 4,605,354,000
Trading securities 8,051,766,000     8,051,766,000   3,217,509,000
Credit loss expense 4,183,000 $ 0   4,183,000 $ 0  
Realized gain (loss) on sale of available for sale Agency Securities 0 3,724,000   (7,501,000) 11,078,000  
TBA Agency Securities            
Debt Securities, Available-for-sale [Line Items]            
Derivative assets (liabilities), net (4,546,000)     (4,546,000)   7,697,000
TBA Agency Securities            
Debt Securities, Available-for-sale [Line Items]            
Trading securities (928,125,000)     (928,125,000)   4,575,060,000
Agency Securities            
Debt Securities, Available-for-sale [Line Items]            
Trading securities 7,777,594,000     7,777,594,000   $ 3,018,676,000
Credit loss expense $ (4,183,000)     (4,183,000)    
Proceeds from sales of agency securities, net   82,100,000 $ 87,875,000 943,314,000    
Realized gain (loss) on sale of available for sale Agency Securities   $ 3,724,000   $ (7,501,000) $ 11,078,000