Stockholders' Equity (Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income) (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	[1]	$ (27,091)	$ 7,656
Accumulated Other Comprehensive Loss Available for Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on sale of AFS securities	[1]		(1,707)
Tax effect	[1]		385
Net of tax	[1]		(1,322)
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]	(1,343)	(961)
Tax effect	[1]	302	217
Net of tax	[1]	(1,041)	(744)
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]	(5,010)	(1,963)
Tax effect	[1]	1,128	443
Net of tax	[1]	(3,882)	(1,520)
Gains and Losses on Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of unrealized gain (loss) on cash flow hedges	[1]	(34,506)	5,786
Tax effect	[1]	7,768	(1,306)
Net of tax	[1]	(26,738)	4,480
Amortization of gain on terminated cash flow hedges	[1]	5,897	8,733
Tax effect	[1]	(1,327)	(1,971)
Net of tax	[1]	$ 4,570	$ 6,762

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

[2] These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with other noninterest
expense (see Note 10 – Retirement Plans for additional details).