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Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax | 117,000 | 111,000 | 355,000 | (357,000) |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax | (4,997,000) | 207,000 | (13,736,000) | 26,742,000 |  |  |  |
Other comprehensive loss before reclassifications | (4,880,000) | 318,000 | (13,381,000) | 26,385,000 |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | 117,000 | 111,000 | 355,000 | (357,000) |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | (4,997,000) | 228,000 | (13,736,000) | 24,146,000 |  |  |  |
Other comprehensive income (loss) | (4,880,000) | 339,000 | (13,381,000) | 23,789,000 |  |  |  |
Changes in pension plan assets and benefit obligations, Net-of-tax amount | (34,421,000) | (26,674,000) | (34,421,000) | (26,674,000) | $ 34,421,000 | $ 34,421,000 | $ 26,674,000 | $ 26,674,000
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | (343,000) | (811,000) | (343,000) | (811,000) | (460,000) | (698,000) | (922,000) | (454,000)
Unrealized gains on available-for-sale securities, Net-of-tax amount | 26,954,000 | 41,685,000 | 26,954,000 | 41,685,000 | 31,951,000 | 40,690,000 | 41,457,000 | 17,539,000
Total accumulated other comprehensive income (loss), Net-of-tax amount | (7,810,000) | 14,200,000 | (7,810,000) | 14,200,000 | $ (2,930,000) | $ 5,571,000 | $ 13,861,000 | $ (9,589,000)
Debt Securities, Realized Gain (Loss) | 0 | 27,000 | 0 | (3,286,000) |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | $ 0 | $ 21,000 | $ 0 | $ (2,596,000) |  |  |  |

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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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