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, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items		$ (24,139)		$ (37,451)
Employee Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items		(24,139)		$ (37,451)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	[1]	5,652	$ 11,135
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]	1,355	158
Tax effect	[1]	(305)	(35)
Net of tax	[1]	1,050	123
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]	(1,707)	(2,166)
Tax effect	[1]	385	487
Net of tax	[1]	(1,322)	(1,679)
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]	(2,274)	(4,555)
Tax effect	[1]	505	1,015
Net of tax	[1]	(1,769)	(3,540)
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]	(1,748)	22,561
Tax effect	[1]	394	(5,054)
Net of tax	[1]	(1,354)	17,507
Amortization of gain (loss) on terminated cash flow hedges	[1]	$ 11,676	$ 4,113
OCI, Cash Flow Hedge, Reclassification for Discontinuance, Statement of Income or Comprehensive Income [Extensible Enumeration]		Interest And Dividend Income Operating	Interest And Dividend Income Operating
Tax effect	[1]	$ (2,629)	$ (921)
Net of tax	[1]	$ 9,047	3,192
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.