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Accumulated Other Comprehensive Income (Loss) - Changes, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Net of tax
Balance	$ 2,269,005	$ 2,656,912	$ 2,656,912
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity			(372,400)
Other comprehensive income (loss)	27,575	(395,809)
Balance	2,329,012	2,285,149	2,269,005
Accumulated Other Comprehensive Income (Loss)
Net of tax
Balance	(639,254)	(121,693)	(121,693)
Other comprehensive income (loss)	27,575	(395,809)
Balance	(611,679)	(517,502)	(639,254)
Pensions and Other Benefits
Net of tax
Balance	(5,431)	(24,390)	(24,390)
Balance	(5,431)	(24,390)	(5,431)
Investment securities
Net of tax
Other comprehensive income (loss)	26,944	(394,551)
Available-for-sale Investment securities
Net of tax
Balance	(292,175)	(97,303)	(97,303)
Other comprehensive income (loss)	18,359	(394,551)
Balance	(273,816)	(491,854)	(292,175)
Held-to-Maturity Investment Securities
Net of tax
Balance	(336,946)
Other comprehensive income (loss)	8,585
Balance	(328,361)		(336,946)
Cash Flow Derivative Hedges
Net of tax
Balance	(4,702)
Other comprehensive income (loss)	631	(1,258)
Balance	$ (4,071)	$ (1,258)	$ (4,702)

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Amount of income (loss) on adjustments for securities transferred from available for sale to held to maturity.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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