v3.26.1
Accumulated Other Comprehensive (Loss), Net of Tax - Schedule of Accumulated Other Comprehensive (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Net gains $ 0 $ 0 $ 0 $ 220
Tax (expense) benefit (66,740) (64,777) (123,266) (121,514)
Interest payments 784,854 775,203 1,561,464 1,530,320
Net actuarial (losses) (36,856) (32,796) (71,215) (63,524)
Net income 256,789 258,848 503,020 485,765
Cash flow hedges        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Estimate of amount to be reclassified from AOCL 5,500   5,500  
Investment Securities Available- for-Sale | Reclassification out of accumulated comprehensive income        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Net gains 0 0 0 528
Tax (expense) benefit 0 0 0 (143)
Net income 0 0 0 385
Derivative Financial Instruments | Reclassification out of accumulated comprehensive income        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Tax (expense) benefit (88) 729 (179) 1,612
Interest payments 320 (2,689) 656 (5,944)
Net income 232 (1,960) 477 (4,332)
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 16 103 32 206
Net income (41) (277) (83) (554)
Net actuarial (losses) | Reclassification out of accumulated comprehensive income        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Net actuarial (losses) $ (57) $ (380) $ (115) $ (760)