Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 135,389	$ 129,582	$ 380,302	$ 325,472
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain or loss on securities available for sale and cash flow hedges	(367,437)	(48,569)	(961,892)	(143,924)
Reclassification of income realized and included in earnings	(1,441)	(6,425)	(10,849)	(9,337)
Valuation adjustments to pension plan attributable to the Voluntary Early Retirement Incentive Program and curtailment				59,606
Other valuation adjustments to employee benefit plans	(410)		(8,397)	(10,651)
Amortization of unrealized net gain (loss) on securities transferred to held to maturity	434	(33)	961	(134)
Other comprehensive loss before income taxes	(368,854)	(55,027)	(980,177)	(104,440)
Income tax benefit	(83,250)	(12,363)	(221,331)	(24,569)
Other comprehensive loss net of income taxes	(285,604)	(42,664)	(758,846)	(79,871)
Comprehensive income (loss)	$ (150,215)	$ 86,918	$ (378,544)	$ 245,601