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Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pre-tax Amount |  |  |
Other comprehensive income , Pre-tax Amount | $ 90,307 | $ 148,713 | $ (705,846)
Income Tax Benefit (Expense) |  |  |
Other comprehensive loss, Income Tax Benefit (Expense) | (24,091) | (39,669) | 188,285
Net of tax |  |  |
Balance | 2,486,066 | 2,269,005 | 2,656,912
Other comprehensive income (loss) | 66,216 | 109,044 | (517,561)
Balance | 2,617,486 | 2,486,066 | 2,269,005
Accumulated Other Comprehensive (Loss) Income |  |  |
Pre-tax Amount |  |  |
Accumulated other comprehensive loss, beginning balance, Pre-tax Amount | (723,100) | (871,813) | (165,967)
Accumulated other comprehensive loss, ending balance, Pre-tax Amount | (632,793) | (723,100) | (871,813)
Income Tax Benefit (Expense) |  |  |
Accumulated other comprehensive loss, beginning balance, Income Tax Benefit (Expense) | 192,890 | 232,559 | 44,274
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense) | 168,799 | 192,890 | 232,559
Net of tax |  |  |
Balance | (530,210) | (639,254) | (121,693)
Other comprehensive income (loss) | 66,216 | 109,044 | (517,561)
Balance | (463,994) | (530,210) | (639,254)
Accumulated Defined Benefit Plans Adjustment Net Unamortized Gain Loss Member |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the year, Pre-tax Amount | 3,939 | (1,063) | 20,710
Income Tax Benefit (Expense) |  |  |
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense) | (1,051) | 284 | (5,524)
Net of tax |  |  |
Unrealized net gains (losses) arising during the year, Net of tax | 2,888 | (779) | 15,186
Accumulated Defined Benefit Plans Amortization Of Net Loss Attributable To Parent Member |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the year, Pre-tax Amount | 826 | 1,142 | 5,146
Income Tax Benefit (Expense) |  |  |
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense) | (220) | (305) | (1,373)
Net of tax |  |  |
Unrealized net gains (losses) arising during the year, Net of tax | 606 | 837 | 3,773
Accumulated Defined Benefit Plans Adjustment Member |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the year, Pre-tax Amount | 4,765 | 79 | 25,856
Income Tax Benefit (Expense) |  |  |
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense) | (1,271) | (21) | (6,897)
Net of tax |  |  |
Balance | (5,373) | (5,431) | (24,390)
Unrealized net gains (losses) arising during the year, Net of tax | 3,494 | 58 | 18,959
Other comprehensive income (loss) | 3,494 | 58 | 18,959
Balance | (1,879) | (5,373) | (5,431)
Available-for-sale Investment securities |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the year, Pre-tax Amount |  |  | (725,289)
Reclassification of net losses (gains) to net income, Pre-tax Amount |  |  | 48,378
Income Tax Benefit (Expense) |  |  |
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense) |  |  | 193,471
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) |  |  | (12,905)
Net of tax |  |  |
Balance | (222,423) | (292,175) | (97,303)
Unrealized net gains (losses) arising during the year, Net of tax |  |  | (531,818)
Reclassification of net gains (losses) to net income, Net of tax |  |  | 35,473
Other comprehensive income (loss) | 28,894 | 69,752 | (567,291)
Balance | (193,529) | (222,423) | (292,175)
Investment securities |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the year, Pre-tax Amount | 13,236 | 55,141 | (773,667)
Reclassification of net losses (gains) to net income, Pre-tax Amount | 26,171 | 39,986 |
Other comprehensive income , Pre-tax Amount | 84,562 | 143,317 |
Income Tax Benefit (Expense) |  |  |
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense) | (3,532) | (14,709) | 206,376
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (6,981) | (10,666) |
Other comprehensive loss, Income Tax Benefit (Expense) | (22,558) | (38,230) |
Net of tax |  |  |
Unrealized net gains (losses) arising during the year, Net of tax | 9,704 | 40,432 | (567,291)
Reclassification of net gains (losses) to net income, Net of tax | 19,190 | 29,320 |
Other comprehensive income (loss) | 62,004 | 105,087 |
Amortization of unrealized holding losses on held-to-maturity securities |  |  |
Pre-tax Amount |  |  |
Reclassification of net losses (gains) to net income, Pre-tax Amount | 45,155 | 48,190 |
Income Tax Benefit (Expense) |  |  |
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (12,045) | (12,855) |
Net of tax |  |  |
Reclassification of net gains (losses) to net income, Net of tax | 33,110 | 35,335 |
Cash flow derivative hedges |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the year, Pre-tax Amount | (845) | (940) | (6,710)
Reclassification of net losses (gains) to net income, Pre-tax Amount | 1,825 | 6,257 | 297
Other comprehensive income , Pre-tax Amount | 980 | 5,317 | (6,413)
Income Tax Benefit (Expense) |  |  |
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense) | 225 | 251 | 1,790
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (487) | (1,669) | (79)
Other comprehensive loss, Income Tax Benefit (Expense) | (262) | (1,418) | 1,711
Net of tax |  |  |
Balance | (803) | (4,702) |
Unrealized net gains (losses) arising during the year, Net of tax | (620) | (689) | (4,920)
Reclassification of net gains (losses) to net income, Net of tax | 1,338 | 4,588 | 218
Other comprehensive income (loss) | 718 | 3,899 | (4,702)
Balance | $ (85) | $ (803) | $ (4,702)

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