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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 4,127,636 $ 3,803,661 $ 3,342,628
Net change in unrealized gain (loss) 243,977 (65,141) 91,061
Reclassification of net (gain) loss realized and included in earnings 35,033 52,832 115,619
Valuation adjustments for employee benefit plans 17,231 28,191 (13,325)
Amortization of unrealized net (gain) loss on securities transferred to held to maturity 1,580 1,670 1,747
Income tax (expense) benefit (67,980) (2,517) (44,047)
Balance 4,460,117 4,127,636 3,803,661
Accumulated Other Comprehensive Loss Available for Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (473,679) (450,748) (584,408)
Net change in unrealized gain (loss) 232,827 (31,119) 104,543
Reclassification of net (gain) loss realized and included in earnings 410   68,105
Income tax (expense) benefit (53,393) 8,188 (38,988)
Balance (293,835) (473,679) (450,748)
Held to Maturity Securities Transferred from AFS [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (8,071) (9,385) (10,734)
Net change in unrealized gain (loss) 0 0 0
Amortization of unrealized net (gain) loss on securities transferred to held to maturity 1,580 1,670 1,747
Income tax (expense) benefit (367) (356) (398)
Balance (6,858) (8,071) (9,385)
Employee Benefit Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (77,235) (103,061) (97,952)
Reclassification of net (gain) loss realized and included in earnings 3,281 4,888 6,800
Valuation adjustments for employee benefit plans 17,231 28,191 (13,325)
Income tax (expense) benefit (4,725) (7,253) 1,416
Balance (61,448) (77,235) (103,061)
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedge [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (47,136) (58,306) (79,093)
Net change in unrealized gain (loss) 8,094 (33,678) (13,850)
Reclassification of net (gain) loss realized and included in earnings 33,742 47,944 40,714
Income tax (expense) benefit (9,495) (3,096) (6,077)
Balance (14,795) (47,136) (58,306)
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (606,092) (621,127) (772,182)
Balance (376,251) (606,092) (621,127)
Equity Method Investment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 29 373 5
Net change in unrealized gain (loss) 3,056 (344) 368
Reclassification of net (gain) loss realized and included in earnings (2,400)    
Amortization of unrealized net (gain) loss on securities transferred to held to maturity 0 0 0
Income tax (expense) benefit 0 0 0
Balance $ 685 $ 29 $ 373