Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 126,467	$ 123,478
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain or (loss) on securities available for sale cash flow hedges and equity method investment	100,944	(390,904)
Reclassification of (income) or loss realized and included in earnings	9,520	(3,838)
Other valuation adjustments to employee benefit plans	(1,836)
Amortization of unrealized net loss on securities transferred to held to maturity	494	261
Other comprehensive income (loss) before income taxes	109,122	(394,481)
Income tax expense (benefit)	24,405	(89,140)
Other comprehensive income (loss) net of income taxes	84,717	(305,341)
Comprehensive income (loss)	$ 211,184	$ (181,863)