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, 2023	Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items		$ (13,325)	$ (24,139)
OCI, Cash Flow Hedge, Reclassification for Discontinuance, Statement of Income or Comprehensive Income [Extensible Enumeration]			Interest and Dividend Income, Operating
Employee Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of defined benefit pension and post-retirement items		(13,325)	$ (24,139)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	[1]	(88,203)	5,652
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 loss on securities transferred to HTM	[1]	1,747	1,355
Tax effect	[1]	(398)	(305)
Net of tax	[1]	1,349	1,050
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]	(68,105)	(1,707)
Tax effect	[1]	15,380	385
Net of tax	[1]	(52,725)	(1,322)
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]	(6,800)	(2,274)
Tax effect	[1]	1,476	505
Net of tax	[1]	(5,324)	(1,769)
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 loss on cash flow hedges	[1]	(47,285)	(1,748)
Tax effect	[1]	10,697	394
Net of tax	[1]	(36,588)	(1,354)
Amortization of gain on terminated cash flow hedges	[1]	$ 6,571	$ 11,676
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]	$ (1,486)	$ (2,629)
Net of tax	[1]	$ 5,085	$ 9,047

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