Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 460,815	$ 392,602	$ 524,089
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain (loss) on securities available for sale and cash flow hedges	(65,141)	91,061	(898,241)
Reclassification of net (gain) loss realized and included in earnings	52,832	115,619	(5,947)
Valuation adjustments to employee benefit plans	28,191	(13,325)	(24,139)
Amortization of unrealized net loss on securities transferred to held to maturity	1,670	1,747	1,355
Other comprehensive income (loss) before income taxes	17,552	195,102	(926,972)
Income tax expense (benefit)	2,517	44,047	(208,725)
Other comprehensive income (loss) net of income taxes	15,035	151,055	(718,247)
Comprehensive income (loss)	$ 475,850	$ 543,657	$ (194,158)