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Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Changes in pension plan assets and benefit obligations, Net-of-tax amount | $ (16,754) | $ (14,839) | $ (16,754) | $ (14,839) | $ 16,754 | $ 16,754 | $ 1,692 | $ (1,692)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | 0 | 17,687 | 0 | 17,687 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 0 | 13,147 | 0 | 13,147 |  |  |  |
Unrealized gains on available-for-sale securities, Net-of-tax amount | (42,450) | (49,523) | (42,450) | (49,523) | (48,261) | (62,929) | (70,146) | (67,883)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax | 5,811 | 20,623 | 20,479 | 18,046 |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 0 |  | 314 |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | 5,811 | 20,623 | 20,479 | 18,360 |  |  |  |
Total accumulated other comprehensive income (loss), Net-of-tax amount | (25,696) | (34,684) | (25,696) | (34,684) | $ (31,507) | $ (46,175) | $ (68,454) | $ (66,191)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 0 | 0 | 0 | (398) |  |  |  |
Other comprehensive loss before reclassifications | 5,811 | 38,310 | 20,479 | 35,733 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 4,540 |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 0 | (4,540) | 0 | (4,540) |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  |  |  | (4,226) |  |  |  |
Other comprehensive income (loss) | 5,811 | 33,770 | 20,479 | 31,507 |  |  |  |
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax | 0 | 0 | 0 | 398 |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 0 | 0 | 0 | 84 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | 0 | 37 | 0 | 37 |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | 0 | (5,783) | 0 | (5,783) |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 0 | (5,746) | 0 | (5,746) |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | 0 | (1,206) | 0 | (1,206) |  |  |  |
Available-for-Sale Securities |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 0 | $ 0 | $ 0 | $ 314 |  |  |  |

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