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Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 347,318
Other comprehensive income (loss), net of tax	(719,108)	$ (125,222)
Ending Balance	(371,790)
Securities Available For Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	380,209	563,801
Other comprehensive income (loss) before reclassifications	(719,693)	(126,430)
Reclassification of amounts included in net income	0	0
Other comprehensive income (loss), net of tax	(719,693)	(126,430)
Ending Balance	(339,484)	437,371
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(32,891)	(50,831)
Other comprehensive income (loss) before reclassifications	0	0
Reclassification of amounts included in net income	585	1,208
Other comprehensive income (loss), net of tax	585	1,208
Ending Balance	(32,306)	(49,623)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	347,318	512,970
Other comprehensive income (loss) before reclassifications	(719,693)	(126,430)
Reclassification of amounts included in net income	585	1,208
Other comprehensive income (loss), net of tax	(719,108)	(125,222)
Ending Balance	$ (371,790)	$ 387,748

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Accumulated Other Comprehensive Income (Loss) [Roll Forward]

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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

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