Quarterly report [Sections 13 or 15(d)]

Available-for-Sale Securities, at Fair Value - Amortized Cost and Carrying Value of AFS Securities (Details)

v3.25.3
Available-for-Sale Securities, at Fair Value - Amortized Cost and Carrying Value of AFS Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]            
Principal/ Current Face $ 7,106,164   $ 8,567,184      
Un-amortized Premium 146,598   167,214      
Accretable Purchase Discount (25,036)   (71,132)      
Amortized Cost 6,403,114   7,697,027      
Allowance for Credit Losses (1,854) $ (2,235) (2,866) $ (2,962) $ (3,340) $ (3,943)
Unrealized Gain 27,619   3,506      
Unrealized Loss (80,722)   (325,956)      
Carrying Value 6,348,157   7,371,711      
Total Agency            
Debt Securities, Available-for-sale [Line Items]            
Principal/ Current Face 6,639,507   8,063,260      
Un-amortized Premium 143,198   163,490      
Accretable Purchase Discount (25,022)   (71,116)      
Amortized Cost 6,399,212   7,692,748      
Allowance for Credit Losses (1,494) (1,894) (2,386) (2,546) (2,893) (3,619)
Unrealized Gain 27,420   3,262      
Unrealized Loss (80,265)   (325,647)      
Carrying Value 6,344,873   7,367,977      
Principal and interest            
Debt Securities, Available-for-sale [Line Items]            
Principal/ Current Face 6,281,036   7,600,374      
Un-amortized Premium 119,311   135,743      
Accretable Purchase Discount (25,022)   (71,116)      
Amortized Cost 6,375,325   7,665,001      
Allowance for Credit Losses 0   0      
Unrealized Gain 27,015   2,789      
Unrealized Loss (77,712)   (321,829)      
Carrying Value 6,324,628   7,345,961      
Interest-only            
Debt Securities, Available-for-sale [Line Items]            
Principal/ Current Face 358,471   462,886      
Un-amortized Premium 23,887   27,747      
Accretable Purchase Discount 0   0      
Amortized Cost 23,887   27,747      
Allowance for Credit Losses (1,494)   (2,386)      
Unrealized Gain 405   473      
Unrealized Loss (2,553)   (3,818)      
Carrying Value 20,245   22,016      
Non-Agency            
Debt Securities, Available-for-sale [Line Items]            
Principal/ Current Face 466,657   503,924      
Un-amortized Premium 3,400   3,724      
Accretable Purchase Discount (14)   (16)      
Amortized Cost 3,902   4,279      
Allowance for Credit Losses (360) $ (341) (480) $ (416) $ (447) $ (324)
Unrealized Gain 199   244      
Unrealized Loss (457)   (309)      
Carrying Value $ 3,284   $ 3,734