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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ (621,127) | $ (772,182)
Net change in unrealized gain (loss) |  |  | (98,151) | (2,559)
Reclassification of net loss realized and included in earnings | $ 14,148 | $ 11,245 | 27,725 | 20,765
Valuation adjustments to employee benefit plans |  |  | 22,014 | (7,521)
Amortization of unrealized net loss on securities transferred to HTM | 390 | 428 | 818 | 922
Income tax (expense) benefit | 1,393 | 22,194 | 10,785 | (2,211)
Ending Balance | (657,936) | (762,786) | (657,936) | (762,786)
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (450,748) | (584,408)
Net change in unrealized gain (loss) |  |  | (59,111) | 17,678
Income tax (expense) benefit |  |  | 13,450 | (3,737)
Ending Balance | (496,409) | (570,467) | (496,409) | (570,467)
Held to Maturity Securities Transferred from AFS [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (9,385) | (10,734)
Amortization of unrealized net loss on securities transferred to HTM |  |  | 818 | 922
Income tax (expense) benefit |  |  | (184) | (207)
Ending Balance | (8,751) | (10,019) | (8,751) | (10,019)
Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (103,061) | (97,952)
Reclassification of net loss realized and included in earnings |  |  | 2,254 | 3,272
Valuation adjustments to employee benefit plans |  |  | 22,014 | (7,521)
Income tax (expense) benefit |  |  | (5,453) | 956
Ending Balance | (84,246) | (101,245) | (84,246) | (101,245)
Gains and Losses on Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (58,306) | (79,093)
Net change in unrealized gain (loss) |  |  | (38,696) | (20,943)
Reclassification of net loss realized and included in earnings |  |  | 25,471 | 17,493
Income tax (expense) benefit |  |  | 2,972 | 777
Ending Balance | (68,559) | (81,766) | (68,559) | (81,766)
Equity Method Investment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 373 | 5
Net change in unrealized gain (loss) |  |  | (344) | 706
Ending Balance | $ 29 | $ 711 | $ 29 | $ 711

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