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Other Comprehensive Income (Loss) (Component of Other Comprehensive Income (Loss)) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]      
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, before tax amount $ 427,331 $ 418,556 $ (182,340)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, before tax amount (1,256) (1,292) (8,818)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, before tax amount (108,989) (293) 156
Total securities available for sale and transferred securities before tax amount 317,086 416,971 (191,002)
Change in the net actuarial gain/loss before tax amount (11,518) (3,644) (7,225)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) before tax amount 5,319 5,623 5,002
Total defined-benefit post-retirement benefit plans (6,199) 1,979 (2,223)
Other comprehensive income (loss), before tax 310,887 418,950 (193,225)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, tax expense (benefit) 89,741 87,897 (38,292)
Securities available for sale and transferred securities, change in net unrealized gain on securities transfers to held-to-maturity, tax expense benefit (264) (271) (1,853)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, tax expense (benefit) (22,888) (62) 33
Total securities available for sale and transferred securities, tax expense (benefit) 66,589 87,564 (40,112)
Change in the net actuarial gain/loss, tax expense (benefit) (2,419) (765) (1,517)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a componet of net periodic cost (benefit) , tax expense (benefit) 1,117 1,181 1,051
Total defined-benefit post-retirement benefit plans, tax expense (benefit) (1,302) 416 (466)
Total other comprehensive income, tax expense (benefit) 65,287 87,980 (40,578)
Securities available for sale and transferred securities, change in net unrealized gain/loss during the period, net of tax amount 337,590 330,659 (144,048)
Securities available for sale and transferred securities. change in net unrealized gain on securities transfers to held-to-maturity, net of tax amount (992) (1,021) (6,965)
Securities available for sale and securities transferred, reclassification adjustment for net (gains) losses included in net income, net of tax amount (86,101) (231) 123
Total securities available for sale and transferred securities, net of tax amount 250,497 329,407 (150,890)
Change in the net actuarial gain/loss, net of tax amount (9,099) (2,879) (5,708)
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 4,202 4,442 3,951
Total defined-benefit post-retirement benefit plans, net of tax amount (4,897) 1,563 (1,757)
Other comprehensive income (loss), net of tax $ 245,600 $ 330,970 $ (152,647)