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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ (42,111) | $ (206,863) | $ (241,186) | $ 53,406
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (157) | (162) | (316) | (322)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 0 | (33) | 0 | (54)
Total securities available for sale and transferred securities, before tax amount | (42,268) | (207,058) | (241,502) | 53,030
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), before tax amount | 419 | 870 | 837 | 1,740
Total defined-benefit post-retirement benefit plans | 419 | 870 | 837 | 1,740
Total other comprehensive income (loss), before tax | (41,849) | (206,188) | (240,665) | 54,770
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | (8,843) | (43,441) | (50,649) | 11,215
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (33) | (34) | (67) | (67)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 0 | (7) | 0 | (11)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | (8,876) | (43,482) | (50,716) | 11,137
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 | 176 | 366
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 88 | 183 | 176 | 366
Total other comprehensive income (loss), Tax Expense (Benefit) | (8,788) | (43,299) | (50,540) | 11,503
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | (33,268) | (163,422) | (190,537) | 42,191
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (124) | (128) | (249) | (255)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | 0 | (26) | 0 | (43)
Total securities available for sale and transferred securities, Net of Tax | (33,392) | (163,576) | (190,786) | 41,893
Reclassification adjustment for net amortization of actuarial gain/lloss included in net income as a component of net periodic cost (benefit), Net of Tax | 331 | 687 | 661 | 1,374
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 331 | 687 | 661 | 1,374
Other comprehensive income (loss), net of tax | $ (33,061) | $ (162,889) | $ (190,125) | $ 43,267

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