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Other Comprehensive Income (Loss) (Component 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 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 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) | $ (1,692) | $ (16,754) | $ (1,692) | $ 16,754 | $ 16,754 | $ 1,692 | $ (1,692)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | 0 | 0 | 0 | 0 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 0 | 0 | 0 | 0 |  |  |  |
Unrealized gains on available-for-sale securities, Net-of-tax amount | (48,261) | (70,146) | (48,261) | (70,146) | (51,413) | (62,929) | (68,087) | (67,883)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax | 3,152 | (2,059) | 14,668 | (2,577) |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  |  |  | 314 |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | 3,152 | (2,059) | 14,668 | (2,263) |  |  |  |
Total accumulated other comprehensive income (loss), Net-of-tax amount | (31,507) | (68,454) | (31,507) | (68,454) | $ (34,659) | $ (46,175) | $ (66,395) | $ (66,191)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  |  | 0 | 398 |  |  |  |
Other comprehensive loss before reclassifications | 3,152 | (2,059) | 14,668 | (2,577) |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  |  |  | 314 |  |  |  |
Other comprehensive income (loss) | $ 3,152 | $ (2,059) | $ 14,668 | $ (2,263) |  |  |  |

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration