v3.25.3
Investments AFS - Contractual Maturities Table (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 17,832,294 $ 18,163,843
AFS Securities - Amortized Cost, 17,860,037 18,207,176 [1]
Non-MBS [Member]    
Debt Securities, Available-for-sale [Line Items]    
AFS - Non-MBS - Due in one year or less - Amortized Cost 1,005,160 464,286
AFS - Non-MBS - Due after one year through five years - Amortized Cost 3,370,729 3,894,415
AFS - Non-MBS - Due after five through ten years - Amortized Cost 511,058 732,897
AFS - Non-MBS - Due after 10 years - Amortized Cost 92,920 93,245
AFS - Non-MBS - Due in one year or less - Fair Value 1,005,966 464,603
AFS - Non-MBS - Due after one year through five years - Fair Value 3,381,930 3,904,699
AFS - Non-MBS - Due after five through ten years - Fair Value 513,400 735,194
AFS - Non-MBS - Due after 10 years - Fair Value 85,944 84,919
Fair Value 4,987,240 5,189,415
AFS Securities - Amortized Cost, [1] 4,979,867 5,184,843
MBS [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 12,845,054 12,974,428
AFS Securities - Amortized Cost, [1] $ 12,880,170 $ 13,022,333
[1] Includes adjustments made to the cost basis of investments for accretion, amortization and/or fair value hedge accounting adjustments, and excludes accrued interest receivable of $57.5 million at September 30, 2025 and $55.0 million at December 31, 2024.