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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Equity [Abstract] |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ (199,075) | $ 260,269
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (159) | (160)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 0 | (21)
Total securities available for sale and transferred securities, before tax amount | (199,234) | 260,088
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), before tax amount | 418 | 870
Total defined-benefit post-retirement benefit plans | 418 | 870
Total other comprehensive income (loss), before tax | (198,816) | 260,958
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | (41,806) | 54,656
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (34) | (33)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 0 | (4)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | (41,840) | 54,619
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), Tax Expense (Benefit) | 88 | 183
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 88 | 183
Total other comprehensive income (loss), Tax Expense (Benefit) | (41,752) | 54,802
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | (157,269) | 205,613
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (125) | (127)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | 0 | (17)
Total securities available for sale and transferred securities, Net of Tax | (157,394) | 205,469
Reclassification adjustment for net amortization of actuarial gain/lloss included in net income as a component of net periodic cost (benefit), Net of Tax | 330 | 687
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 330 | 687
Other comprehensive income (loss), net of tax | $ (157,064) | $ 206,156

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