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v3.25.3

Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net of Tax |  |  |  |
Balance at beginning of period | $ 2,694,545 | $ 2,550,312 | $ 2,617,486 | $ 2,486,066
Other comprehensive income (loss) | 18,859 | 66,474 | 75,845 | 77,552
Balance at end of period | 2,733,921 | 2,648,034 | 2,733,921 | 2,648,034
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Net of Tax |  |  |  |
Balance at beginning of period | (407,008) | (519,132) | (463,994) | (530,210)
Other comprehensive income (loss) | 18,859 | 66,474 | 75,845 | 77,552
Balance at end of period | (388,149) | (452,658) | (388,149) | (452,658)
Pensions and Other Benefits |  |  |  |
Net of Tax |  |  |  |
Balance at beginning of period | (1,879) | (5,373) | (1,879) | (5,373)
Balance at end of period | (1,879) | (5,373) | (1,879) | (5,373)
Investment securities |  |  |  |
Net of Tax |  |  |  |
Other comprehensive income (loss) | 19,315 | 66,101 | 76,010 | 76,452
Available-for-Sale Investment Securities |  |  |  |
Net of Tax |  |  |  |
Balance at beginning of period | (151,234) | (228,076) | (193,529) | (222,423)
Other comprehensive income (loss) | 10,908 | 55,893 | 53,203 | 50,240
Balance at end of period | (140,326) | (172,183) | (140,326) | (172,183)
Held-to-Maturity Investment Securities |  |  |  |
Net of Tax |  |  |  |
Balance at beginning of period | (254,101) | (285,607) | (268,501) | (301,611)
Other comprehensive income (loss) | 8,407 | 10,208 | 22,807 | 26,212
Balance at end of period | (245,694) | (275,399) | (245,694) | (275,399)
Cash Flow Derivative Hedges |  |  |  |
Net of Tax |  |  |  |
Balance at beginning of period | 206 | (76) | (85) | (803)
Other comprehensive income (loss) | (456) | 373 | (165) | 1,100
Balance at end of period | $ (250) | $ 297 | $ (250) | $ 297

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