Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 12,618
Personnel	(426,687)	$ (432,151)	$ (487,063)
Interest income	1,551	3,359	895
Net other comprehensive income (loss) during period	(22,935)	45,801	91,789
Ending Balance	(10,317)	12,618
Investment Securities AFS
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	41,325	3,989	(75,643)
Other comprehensive income before reclassifications	(63,714)	55,628	111,592
Investment securities (gains), net	16	(9,222)	(5,957)
Personnel	0	0	0
Other Expenses	0	0
Interest income	1,551	3,359	895
Other Comprehensive Income (Loss), Tax	15,557	(12,429)	(26,898)
Net other comprehensive income (loss) during period	(46,591)	37,336	79,631
Ending Balance	(5,266)	41,325	3,989
Defined Benefit Pension and Postretirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(28,707)	(37,172)	(49,330)
Other comprehensive income before reclassifications	25,519	7,780	16,296
Investment securities (gains), net	0	0	0
Personnel	1,346	(148)	(148)
Other Expenses	4,594	3,897	476
Interest income	0	0	0
Other Comprehensive Income (Loss), Tax	(7,803)	(3,064)	(4,465)
Net other comprehensive income (loss) during period	23,656	8,465	12,158
Ending Balance	(5,051)	(28,707)	(37,172)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	12,618	(33,183)	(124,972)
Other comprehensive income before reclassifications	(38,195)	63,408	127,887
Investment securities (gains), net	16	(9,222)	(5,957)
Personnel	1,346	(148)	(148)
Other Expenses	4,594	3,897	476
Interest income	1,551	3,359	895
Other Comprehensive Income (Loss), Tax	7,754	(15,493)	(31,363)
Net other comprehensive income (loss) during period	(22,935)	45,801	91,789
Ending Balance	$ (10,317)	$ 12,618	$ (33,183)