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Other Comprehensive Income (Loss) (Component of Other Comprehensive Income (Loss)) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Equity [Abstract]      
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, before tax amount $ (171,662) $ 277,926 $ (2,143,567)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, before tax amount (629) (649) (737)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, before tax amount 96 (66) 0
Total securities available for sale and transferred securities before tax amount (172,195) 277,211 (2,144,304)
Change in the net actuarial gain/loss before tax amount 2,439 9,278 (5,005)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) before tax amount 1,673 3,479 2,964
Total defined-benefit post-retirement benefit plans 4,112 12,757 (2,041)
Other comprehensive income (loss), before tax (168,083) 289,968 (2,146,345)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, tax expense (benefit) (36,049) 58,364 (450,149)
Securities available for sale and transferred securities, change in net unrealized gain on securities transfers to held-to-maturity, tax expense benefit (132) (136) (155)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, tax expense (benefit) 20 (14)  
Total securities available for sale and transferred securities, tax expense (benefit) (36,161) 58,214 (450,304)
Change in the net actuarial gain/loss, tax expense (benefit) 512 1,948 (1,051)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a componet of net periodic cost (benefit) , tax expense (benefit) 351 731 622
Total defined-benefit post-retirement benefit plans, tax expense (benefit) 863 2,679 (429)
Total other comprehensive income, tax expense (benefit) (35,298) 60,893 (450,733)
Securities available for sale and transferred securities, change in net unrealized gain/loss during the period, net of tax amount (135,613) 219,562 (1,693,418)
Securities available for sale and transferred securities. change in net unrealized gain on securities transfers to held-to-maturity, net of tax amount (497) (513) (582)
Securities available for sale and securities transferred, reclassification adjustment for net (gains) losses included in net income, net of tax amount 76 (52)  
Total securities available for sale and transferred securities, net of tax amount (136,034) 218,997 (1,694,000)
Change in the net actuarial gain/loss, net of tax amount 1,927 7,330 (3,954)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a componet of net periodic cost (benefit), net of tax amount 1,322 2,748 2,342
Total defined-benefit post-retirement benefit plans, net of tax amount 3,249 10,078 (1,612)
Other comprehensive income (loss), net of tax $ (132,785) $ 229,075 $ (1,695,612)