v3.22.4
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