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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | $ (621,127) | $ (772,182)
Net change in unrealized gain (loss) | (77,799) | 100,944
Reclassification of net loss realized and included in earnings | 13,577 | 9,520
Valuation adjustments to employee benefit plans | 22,014 | (1,836)
Amortization of unrealized net loss on securities transferred to HTM | 428 | 494
Income tax (expense) benefit | 9,392 | (24,405)
Ending Balance | (653,515) | (687,465)
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) | (48,264) | 80,958
Income tax (expense) benefit | 10,927 | (18,224)
Ending Balance | (488,085) | (521,674)
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 | 428 | 494
Income tax (expense) benefit | (96) | (111)
Ending Balance | (9,053) | (10,351)
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 | 1,019 | 1,519
Valuation adjustments to employee benefit plans | 22,014 | (1,836)
Income tax (expense) benefit | (5,176) | 71
Ending Balance | (85,204) | (98,198)
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) | (29,191) | 19,280
Reclassification of net loss realized and included in earnings | 12,558 | 8,001
Income tax (expense) benefit | 3,737 | (6,141)
Ending Balance | (71,202) | (57,953)
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

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