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Accumulated Other Comprehensive (Loss), Net of Tax - Schedule of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 9,133,214 | $ 8,689,996 | $ 8,056,186
Net unrealized gain arising during the year | 197,377 | (141,496) | 97,565
Amounts reclassified from accumulated other comprehensive (loss) | 8,162 | 135,684 | 36,824
Other comprehensive income, net of tax | 205,539 | (5,812) | 134,389
Ending Balance | 9,492,236 | 9,133,214 | 8,689,996
Accumulated Other Comprehensive (Loss), Net of Tax |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (556,383) | (550,571) | (684,960)
Ending Balance | (350,844) | (556,383) | (550,571)
Investment Securities Available- for-Sale |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (520,318) | (517,450) | (631,160)
Net unrealized gain arising during the year | 186,590 | (106,447) | 90,654
Amounts reclassified from accumulated other comprehensive (loss) | (385) | 103,579 | 23,056
Other comprehensive income, net of tax | 186,205 | (2,868) | 113,710
Ending Balance | (334,113) | (520,318) | (517,450)
Derivative Financial Instruments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (9,600) | (2,869) | (8,874)
Net unrealized gain arising during the year | 5,902 | (37,446) | (4,883)
Amounts reclassified from accumulated other comprehensive (loss) | 7,439 | 30,715 | 10,888
Other comprehensive income, net of tax | 13,341 | (6,731) | 6,005
Ending Balance | 3,741 | (9,600) | (2,869)
Defined Benefit Pension and Other Postretirement Benefit Plans |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (26,465) | (30,252) | (44,926)
Net unrealized gain arising during the year | 4,885 | 2,397 | 11,794
Amounts reclassified from accumulated other comprehensive (loss) | 1,108 | 1,390 | 2,880
Other comprehensive income, net of tax | 5,993 | 3,787 | 14,674
Ending Balance | $ (20,472) | $ (26,465) | $ (30,252)

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