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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)

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