Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 108,612	$ 126,467
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain (loss) on securities available for sale cash flow hedges and equity method investment	(77,799)	100,944
Reclassification of loss realized and included in earnings	13,577	9,520
Valuation adjustments to employee benefit plans	22,014	(1,836)
Amortization of unrealized net loss on securities transferred to held to maturity	428	494
Other comprehensive income (loss) before income taxes	(41,780)	109,122
Income tax expense (benefit)	(9,392)	24,405
Other comprehensive income (loss) net of income taxes	(32,388)	84,717
Comprehensive income (loss)	$ 76,224	$ 211,184