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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity [Abstract]        
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount $ 30,668 $ 156,509 $ (129,111) $ 386,627
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount (245) (308) (504) (685)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount 0 0 0 (108,989)
Total securities available for sale and transferred securities, before tax amount 30,423 156,201 (129,615) 276,953
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), before tax amount 1,529 1,329 3,058 2,659
Total defined-benefit post-retirement benefit plans 1,529 1,329 3,058 2,659
Total other comprehensive income (loss), before tax 31,952 157,530 (126,557) 279,612
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) 6,441 32,868 (27,113) 81,193
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) (52) (65) (106) (144)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit)     0 (22,888)
Total securities available for sale and transferred securities, Tax Expense (Benefit) 6,389 32,803 (27,219) 58,161
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), Tax Expense (Benefit) 321 278 642 557
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) 321 278 642 557
Total other comprehensive income (loss), Tax Expense (Benefit) 6,710 33,081 (26,577) 58,718
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax 24,227 123,641 (101,998) 305,434
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax (193) (243) (398) (541)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax     0 (86,101)
Total securities available for sale and transferred securities, Net of Tax 24,034 123,398 (102,396) 218,792
Reclassification adjustment for net amortization of actuarial gain/lloss included in net income as a component of net periodic cost (benefit), Net of Tax 1,208 1,051 2,416 2,102
Total defined-benefit post-retirement benefit plans, Net of Tax Amount 1,208 1,051 2,416 2,102
Other comprehensive income (loss), net of tax $ 25,242 $ 124,449 $ (99,980) $ 220,894