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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 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 | 113 | 15 | 238 | (468) |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax | 4,858 | 8,359 | (8,739) | 26,535 |  |  |  |
Other comprehensive loss before reclassifications | 4,971 | 8,374 | (8,501) | 26,067 |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | 113 | 15 | 238 | (468) |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | 4,858 | 5,742 | (8,739) | 23,918 |  |  |  |
Other comprehensive income (loss) | 4,971 | 5,757 | (8,501) | 23,450 |  |  |  |
Changes in pension plan assets and benefit obligations, Net-of-tax amount | (34,421) | (26,674) | (34,421) | (26,674) | $ 34,421 | $ 34,421 | $ 26,674 | $ 26,674
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | (460) | (922) | (460) | (922) | (573) | (698) | (937) | (454)
Unrealized gains on available-for-sale securities, Net-of-tax amount | 31,951 | 41,457 | 31,951 | 41,457 | 27,093 | 40,690 | 35,715 | 17,539
Total accumulated other comprehensive income (loss), Net-of-tax amount | (2,930) | 13,861 | (2,930) | 13,861 | $ (7,901) | $ 5,571 | $ 8,104 | $ (9,589)
Debt Securities, Realized Gain (Loss) | 0 | (3,313) | 0 | (3,313) |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | $ 0 | $ (2,617) | $ 0 | $ (2,617) |  |  |  |

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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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