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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 498,371 | $ (600,441) | $ 257,185 | $ (547,035)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (150) | (164) | (466) | (486)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | (16) | (12) | (16) | (66)
Total securities available for sale and transferred securities, before tax amount | 498,205 | (600,617) | 256,703 | (547,587)
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 | 869 | 1,255 | 2,609
Total defined-benefit post-retirement benefit plans | 418 | 869 | 1,255 | 2,609
Total other comprehensive income (loss), before tax | 498,623 | (599,748) | 257,958 | (544,978)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 104,658 | (126,092) | 54,009 | (114,877)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (31) | (35) | (98) | (102)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | (3) | (3) | (3) | (14)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 104,624 | (126,130) | 53,908 | (114,993)
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 | 182 | 264 | 548
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 88 | 182 | 264 | 548
Total other comprehensive income (loss), Tax Expense (Benefit) | 104,712 | (125,948) | 54,172 | (114,445)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | 393,713 | (474,349) | 203,176 | (432,158)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (119) | (129) | (368) | (384)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | (13) | (9) | (13) | (52)
Total securities available for sale and transferred securities, Net of Tax | 393,581 | (474,487) | 202,795 | (432,594)
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 | 991 | 2,061
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 330 | 687 | 991 | 2,061
Other comprehensive income (loss), net of tax | $ 393,911 | $ (473,800) | $ 203,786 | $ (430,533)

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