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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | $ 4,278,672 | $ 3,853,436 | $ 4,127,636 | $ 3,803,661
Reclassification of net loss realized and included in earnings | 9,668 | 14,148 | 19,083 | 27,725
Amortization of unrealized net loss on securities transferred to HTM | 387 | 390 | 792 | 818
Income tax (expense) benefit | (13,181) | 1,393 | (41,393) | 10,785
Balance | 4,365,419 | 3,920,718 | 4,365,419 | 3,920,718
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | (473,679) | (450,748)
Net change in unrealized gain (loss) |  |  | 146,860 | (59,111)
Income tax (expense) benefit |  |  | (34,140) | 13,450
Balance | (360,959) | (496,409) | (360,959) | (496,409)
Held to Maturity Securities Transferred from AFS [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | (8,071) | (9,385)
Amortization of unrealized net loss on securities transferred to HTM |  |  | 792 | 818
Income tax (expense) benefit |  |  | (196) | (184)
Balance | (7,475) | (8,751) | (7,475) | (8,751)
Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | (77,235) | (103,061)
Reclassification of net loss realized and included in earnings |  |  | 1,888 | 2,254
Valuation adjustments to employee benefit plans |  |  |  | 22,014
Income tax (expense) benefit |  |  | (594) | (5,453)
Balance | (75,941) | (84,246) | (75,941) | (84,246)
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | (514,972) | (653,515) | (606,092) | (621,127)
Net change in unrealized gain (loss) |  |  | 157,783 | (98,151)
Reclassification of net loss realized and included in earnings |  |  | 19,083 | 27,725
Valuation adjustments to employee benefit plans |  |  |  | 22,014
Amortization of unrealized net loss on securities transferred to HTM |  |  | 792 | 818
Income tax (expense) benefit |  |  | (41,393) | 10,785
Balance | (469,827) | (657,936) | (469,827) | (657,936)
Gains and Losses on Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | (47,136) | (58,306)
Net change in unrealized gain (loss) |  |  | 11,096 | (38,696)
Reclassification of net loss realized and included in earnings |  |  | 17,195 | 25,471
Income tax (expense) benefit |  |  | (6,463) | 2,972
Balance | (25,308) | (68,559) | (25,308) | (68,559)
Equity Method Investment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | 29 | 373
Net change in unrealized gain (loss) |  |  | (173) | (344)
Balance | $ (144) | $ 29 | $ (144) | $ 29

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