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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

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