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Accumulated Other Comprehensive (Loss), Net of Tax - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Net unrealized gains (losses) $ 220 $ (136,224) $ (33,620)
Tax (expense) benefit (257,347) (248,300) (216,664)
Net income 1,002,802 768,707 867,840
Hedge terminations (1,523,614) (1,588,899) (1,290,991)
Time-value premiums 4,021,508 3,927,286 3,628,260
Other expense (155,996) (139,309) (168,748)
Cash Flow Hedging      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Estimate of amount to be reclassified from AOCL (4,100)    
Investment Securities Available- for-Sale | Reclassification out of accumulated comprehensive income      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Net unrealized gains (losses) 528 (141,418) (31,533)
Tax (expense) benefit (143) 37,839 8,477
Net income 385 (103,579) (23,056)
Derivative Financial Instruments | Reclassification out of accumulated comprehensive income      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Tax (expense) benefit 2,768 11,324 4,050
Net income (7,439) (30,715) (10,888)
Interest payments (10,207) (41,472) (12,279)
Hedge terminations 0 (34) (310)
Time-value premiums 0 (533) (2,349)
Defined Benefit Pension and Other Postretirement Benefit Plans | Reclassification out of accumulated comprehensive income      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Tax (expense) benefit 412 517 1,072
Net income (1,108) (1,390) (2,880)
Transition obligation | Reclassification out of accumulated comprehensive income      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Other expense 2 0 0
Net actuarial (losses) | Reclassification out of accumulated comprehensive income      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Other expense (1,522) (1,907) (2,083)
Other | Reclassification out of accumulated comprehensive income      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Other expense $ 0 $ 0 $ (1,869)