Stockholders' Equity (Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items			$ (37,451)	$ 2,398
Employee Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items			(37,451)	$ 2,398
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	[1]	$ 11,135	9,238
Reclassification out of Accumulated Other Comprehensive Income [Member] | Held to Maturity Securities Transferred from AFS [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized net gain (loss) on securities transferred to HTM	[1]	158	470
Tax effect	[1]	(35)	(105)
Net of tax	[1]	123	365
Reclassification out of Accumulated Other Comprehensive Income [Member] | Available for Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on sale of AFS securities	[1]	(2,166)	488
Tax effect	[1]	487	(109)
Net of tax	[1]	1,679	(379)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Employee Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items	[1]	(4,555)	(6,368)
Tax effect	[1]	1,015	1,390
Net of tax	[1]	(3,540)	(4,978)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of unrealized gain or loss on cash flow hedges	[1]	22,561	18,704
Tax effect	[1]	(5,054)	(4,182)
Net of tax	[1]	17,507	14,522
Amortization of gain (loss) on terminated cash flow hedges	[1]	4,113	(1,353)
Tax effect	[1]	(921)	303
Net of tax	[1]	(3,192)	$ 1,050
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Equity Method Investment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of unrealized loss on equity method investment	[1]	(4,468)
Net of tax	[1]	$ (4,468)

[1] Amounts in parentheses indicate reduction in net income.