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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 8,689,996 | $ 8,056,186 | $ 3,438,325
Net unrealized (losses) arising during the year | (109,454) | 102,251 | (671,816)
Amounts reclassified from accumulated other comprehensive (loss) | 103,642 | 32,138 | 9,436
Other comprehensive (loss) income, net of tax | (5,812) | 134,389 | (662,380)
Ending Balance | 9,133,214 | 8,689,996 | 8,056,186
Accumulated Other Comprehensive (Loss), Net of Tax |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (550,571) | (684,960) | (22,580)
Ending Balance | (556,383) | (550,571) | (684,960)
Investment Securities Available- for-Sale |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (517,450) | (631,160) | 4,536
Net unrealized (losses) arising during the year | (104,628) | 86,391 | (640,656)
Amounts reclassified from accumulated other comprehensive (loss) | 101,760 | 27,319 | 4,960
Other comprehensive (loss) income, net of tax | (2,868) | 113,710 | (635,696)
Ending Balance | (520,318) | (517,450) | (631,160)
Derivative Financial Instruments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (2,869) | (8,874) | 6,070
Net unrealized (losses) arising during the year | (7,223) | 4,066 | (17,810)
Amounts reclassified from accumulated other comprehensive (loss) | 492 | 1,939 | 2,866
Other comprehensive (loss) income, net of tax | (6,731) | 6,005 | (14,944)
Ending Balance | (9,600) | (2,869) | (8,874)
Defined Benefit Pension and Other Postretirement Benefit Plans |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (30,252) | (44,926) | (33,186)
Net unrealized (losses) arising during the year | 2,397 | 11,794 | (13,350)
Amounts reclassified from accumulated other comprehensive (loss) | 1,390 | 2,880 | 1,610
Other comprehensive (loss) income, net of tax | 3,787 | 14,674 | (11,740)
Ending Balance | $ (26,465) | $ (30,252) | $ (44,926)

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