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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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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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