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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)