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Other Comprehensive Income (Loss) (Component of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Equity [Abstract] |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, before tax amount | $ (2,143,567) | $ (231,355) | $ 427,331
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, before tax amount | (737) | (971) | (1,256)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, before tax amount | 0 | (69) | (108,989)
Total securities available for sale and transferred securities before tax amount | (2,144,304) | (232,395) | 317,086
Change in the net actuarial gain/loss before tax amount | (5,005) | 16,593 | (11,518)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) before tax amount | 2,964 | 6,116 | 5,319
Total defined-benefit post-retirement benefit plans | (2,041) | 22,709 | (6,199)
Other comprehensive income (loss), before tax | (2,146,345) | (209,686) | 310,887
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, tax expense (benefit) | (450,149) | (48,585) | 89,741
Securities available for sale and transferred securities, change in net unrealized gain on securities transfers to held-to-maturity, tax expense benefit | (155) | (204) | (264)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, tax expense (benefit) | 0 | (14) | (22,888)
Total securities available for sale and transferred securities, tax expense (benefit) | (450,304) | (48,803) | 66,589
Change in the net actuarial gain/loss, tax expense (benefit) | (1,051) | 3,485 | (2,419)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a componet of net periodic cost (benefit) , tax expense (benefit) | 622 | 1,284 | 1,117
Total defined-benefit post-retirement benefit plans, tax expense (benefit) | (429) | 4,769 | (1,302)
Total other comprehensive income, tax expense (benefit) | (450,733) | (44,034) | 65,287
Securities available for sale and transferred securities, change in net unrealized gain/loss during the period, net of tax amount | (1,693,418) | (182,770) | 337,590
Securities available for sale and transferred securities. change in net unrealized gain on securities transfers to held-to-maturity, net of tax amount | (582) | (767) | (992)
Securities available for sale and securities transferred, reclassification adjustment for net (gains) losses included in net income, net of tax amount | 0 | (55) | (86,101)
Total securities available for sale and transferred securities, net of tax amount | (1,694,000) | (183,592) | 250,497
Change in the net actuarial gain/loss, net of tax amount | (3,954) | 13,108 | (9,099)
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 | 2,342 | 4,832 | 4,202
Total defined-benefit post-retirement benefit plans, net of tax amount | (1,612) | 17,940 | (4,897)
Other comprehensive income (loss), net of tax | $ (1,695,612) | $ (165,652) | $ 245,600

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