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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, 2022
Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, net of tax [1] $ 7,656 $ 6,363
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) (2,166)
Tax effect [1] 385 487
Net of tax [1] (1,322) (1,679)
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] (961) 134
Tax effect [1] 217 (30)
Net of tax [1] (744) 104
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] (1,963) (3,970)
Tax effect [1] 443 884
Net of tax [1] (1,520) (3,086)
Gains and Losses on Cash Flow Hedges [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification of unrealized gain on cash flow hedges [1] 5,786 18,771
Tax effect [1] (1,306) (4,188)
Net of tax [1] 4,480 14,583
Amortization of gain on terminated cash flow hedges 8,733 [1] 1,170
Tax effect (1,971) [1] (261)
Net of tax $ 6,762 [1] 909
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
[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)