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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Changes in pension plan assets and benefit obligations, Net-of-tax amount | $ (14,839) | $ 6,680 | $ (14,839) | $ 6,680 | $ 1,692 | $ 1,692 | $ 6,680 | $ 6,680
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | 17,687 | 0 | 17,687 | 0 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax [Abstract] | (4,540) | 0 | (4,540) | 0 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 13,147 |  | 13,147 |  |  |  |  |
Unrealized gains on available-for-sale securities, Net-of-tax amount | (49,523) | (109,210) | (49,523) | (109,210) | (70,146) | (67,883) | (90,106) | (95,714)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax | 20,623 | (19,104) | 18,046 | (13,496) |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0 | 0 | 314 | 0 |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | 20,623 | (19,104) | 18,360 | (13,496) |  |  |  |
Total accumulated other comprehensive income (loss), Net-of-tax amount | (34,684) | (115,890) | (34,684) | (115,890) | $ (68,454) | $ (66,191) | $ (96,786) | $ (102,394)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 0 | 0 | 398 | 0 |  |  |  |
Other comprehensive loss before reclassifications | 38,310 | (19,104) | 35,733 | (13,496) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (4,540) |  | (4,226) |  |  |  |  |
Other comprehensive income (loss) | 33,770 | (19,104) | 31,507 | (13,496) |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 0 | 0 | 84 | 0 |  |  |  |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 37 | 0 | 37 | 0 |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | (5,783) | 0 | (5,783) | 0 |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | (5,746) | 0 | (5,746) | 0 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | $ (1,206) | $ 0 | $ (1,206) | $ 0 |  |  |  |

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