v3.26.1
Investments AFS - Contractual Maturities Table (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 20,595,928 $ 18,189,327
AFS Securities - Amortized Cost, 20,573,450 18,171,361 [1]
Non-MBS [Member]    
Debt Securities, Available-for-sale [Line Items]    
AFS - Non-MBS - Due in one year or less - Amortized Cost 445,503 488,836
AFS - Non-MBS - Due after one year through five years - Amortized Cost 4,640,068 4,349,934
AFS - Non-MBS - Due after five through ten years - Amortized Cost 877,582 984,185
AFS - Non-MBS - Due after 10 years - Amortized Cost 81,700 79,110
AFS - Non-MBS - Due in one year or less - Fair Value 446,522 489,345
AFS - Non-MBS - Due after one year through five years - Fair Value 4,655,988 4,368,488
AFS - Non-MBS - Due after five through ten years - Fair Value 877,274 988,832
AFS - Non-MBS - Due after 10 years - Fair Value 77,161 74,511
Fair Value 6,056,945 5,921,176
AFS Securities - Amortized Cost, [1] 6,044,853 5,902,065
MBS [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 14,538,983 12,268,151
AFS Securities - Amortized Cost, [1] $ 14,528,597 $ 12,269,296
[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 $66.4 million at June 30, 2026 and $59.1 million at December 31, 2025.