Other Comprehensive Income (Loss) (Reclassifications Out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain on securities transactions	$ 16	$ 197
Interest Expense	6,463	10,531
Compensation and employee benefits	37,067	35,312
Income tax expense	15,231	16,226
Total reclassification	43,962	48,559
Reclassification adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassification	249	372
Reclassification adjustment | Unrealized Losses on Available for Sale Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain on securities transactions	0	(230)
Income tax expense	0	59
Total reclassification	0	(171)
Reclassification adjustment | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest Expense	666	879
Income tax expense	(178)	(227)
Total reclassification	488	652
Reclassification adjustment | Post- Retirement Obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Compensation and employee benefits	(326)	(150)
Income tax expense	87	41
Total reclassification	$ (239)	$ (109)