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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Equity [Abstract]    
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount $ 155,632 $ (199,075)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount (521) (159)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount 14 0
Total securities available for sale and transferred securities, before tax amount 155,125 (199,234)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), before tax amount 310 418
Total defined-benefit post-retirement benefit plans 310 418
Total other comprehensive income (loss), before tax 155,435 (198,816)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) 32,683 (41,806)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) (109) (34)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) 3 0
Total securities available for sale and transferred securities, Tax Expense (Benefit) 32,577 (41,840)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), Tax Expense (Benefit) 65 88
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) 65 88
Total other comprehensive income (loss), Tax Expense (Benefit) 32,642 (41,752)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax 122,949 (157,269)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax (412) (125)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax 11 0
Total securities available for sale and transferred securities, Net of Tax 122,548 (157,394)
Reclassification adjustment for net amortization of actuarial gain/lloss included in net income as a component of net periodic cost (benefit), Net of Tax 245 330
Total defined-benefit post-retirement benefit plans, Net of Tax Amount 245 330
Other comprehensive income (loss), net of tax $ 122,793 $ (157,064)