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v3.25.2

Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ (14,563) | $ (42,111) | $ 141,069 | $ (241,186)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | 0 | (157) | (521) | (316)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 0 | 0 | 14 | 0
Total securities available for sale and transferred securities, before tax amount | (14,563) | (42,268) | 140,562 | (241,502)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), before tax amount | 309 | 419 | 619 | 837
Total defined-benefit post-retirement benefit plans | 309 | 419 | 619 | 837
Total other comprehensive income (loss), before tax | (14,254) | (41,849) | 141,181 | (240,665)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | (3,058) | (8,843) | 29,625 | (50,649)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | 0 | (33) | (109) | (67)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 0 | 0 | 3 | 0
Total securities available for sale and transferred securities, Tax Expense (Benefit) | (3,058) | (8,876) | 29,519 | (50,716)
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 | 130 | 176
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 65 | 88 | 130 | 176
Total other comprehensive income (loss), Tax Expense (Benefit) | (2,993) | (8,788) | 29,649 | (50,540)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | (11,505) | (33,268) | 111,444 | (190,537)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | 0 | (124) | (412) | (249)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | 0 | 0 | 11 | 0
Total securities available for sale and transferred securities, Net of Tax | (11,505) | (33,392) | 111,043 | (190,786)
Reclassification adjustment for net amortization of actuarial gain/lloss included in net income as a component of net periodic cost (benefit), Net of Tax | 244 | 331 | 489 | 661
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 244 | 331 | 489 | 661
Other comprehensive income (loss), net of tax | $ (11,261) | $ (33,061) | $ 111,532 | $ (190,125)

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