Income Taxes - Schedule of Components of Consolidated Statements of Income and Equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax expense/(benefit)	$ 133,291	$ 157,602	$ 131,892
Net unrealized gains/(losses) on pension and other postretirement plans	4,876	(177)	(832)
Net unrealized gains/(losses) on securities available-for-sale	35,062	(16,054)	(2,955)
Net unrealized gains/(losses) on cash flow hedges	5,035	(1,360)	(3,163)
Total	$ 178,264	$ 140,011	$ 124,942