Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 115,572	$ 97,738	$ 338,741	$ 341,999
Other comprehensive income (loss) before income taxes:
Net change in unrealized loss on securities available for sale, cash flow hedges and equity method investment	219,703	(184,530)	121,552	(187,089)
Reclassification of loss realized and included in earnings	13,964	12,854	41,689	33,619
Valuation adjustments to employee benefit plans	0	214	22,014	(7,307)
Amortization of unrealized net loss on securities transferred to held to maturity	461	421	1,279	1,343
Other comprehensive income (loss) before income taxes	234,128	(171,041)	186,534	(159,434)
Income tax expense (benefit)	51,688	(38,833)	40,903	(36,622)
Other comprehensive income (loss) net of income taxes	182,440	(132,208)	145,631	(122,812)
Comprehensive income (loss)	$ 298,012	$ (34,470)	$ 484,372	$ 219,187