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Other Comprehensive Income (Loss) (Component of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Equity [Abstract] |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, before tax amount | $ (231,355) | $ 427,331 | $ 418,556
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, before tax amount | (971) | (1,256) | (1,292)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, before tax amount | (69) | (108,989) | (293)
Total securities available for sale and transferred securities before tax amount | (232,395) | 317,086 | 416,971
Change in the net actuarial gain/loss before tax amount | 16,593 | (11,518) | (3,644)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) before tax amount | 6,116 | 5,319 | 5,623
Total defined-benefit post-retirement benefit plans | 22,709 | (6,199) | 1,979
Other comprehensive income (loss), before tax | (209,686) | 310,887 | 418,950
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, tax expense (benefit) | (48,585) | 89,741 | 87,897
Securities available for sale and transferred securities, change in net unrealized gain on securities transfers to held-to-maturity, tax expense benefit | (204) | (264) | (271)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, tax expense (benefit) | (14) | (22,888) | (62)
Total securities available for sale and transferred securities, tax expense (benefit) | (48,803) | 66,589 | 87,564
Change in the net actuarial gain/loss, tax expense (benefit) | 3,485 | (2,419) | (765)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a componet of net periodic cost (benefit) , tax expense (benefit) | 1,284 | 1,117 | 1,181
Total defined-benefit post-retirement benefit plans, tax expense (benefit) | 4,769 | (1,302) | 416
Total other comprehensive income, tax expense (benefit) | (44,034) | 65,287 | 87,980
Securities available for sale and transferred securities, change in net unrealized gain/loss during the period, net of tax amount | (182,770) | 337,590 | 330,659
Securities available for sale and transferred securities. change in net unrealized gain on securities transfers to held-to-maturity, net of tax amount | (767) | (992) | (1,021)
Securities available for sale and securities transferred, reclassification adjustment for net (gains) losses included in net income, net of tax amount | (55) | (86,101) | (231)
Total securities available for sale and transferred securities, net of tax amount | (183,592) | 250,497 | 329,407
Change in the net actuarial gain/loss, net of tax amount | 13,108 | (9,099) | (2,879)
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 | 4,832 | 4,202 | 4,442
Total defined-benefit post-retirement benefit plans, net of tax amount | 17,940 | (4,897) | 1,563
Other comprehensive income (loss), net of tax | $ (165,652) | $ 245,600 | $ 330,970

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