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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive loss before reclassifications | $ 318,000 | $ 13,840,000 | $ 26,385,000 | $ 36,841,000 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  |  | 0 | 0 |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | 111,000 | (49,000) | (357,000) | (556,000) |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | 228,000 | 13,742,000 | 24,146,000 | 37,730,000 |  |  |  |
Other comprehensive income (loss) | 339,000 | 13,693,000 | 23,789,000 | 37,174,000 |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax | 207,000 | 13,889,000 | 26,742,000 | 37,397,000 |  |  |  |
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 | 111,000 | (49,000) | (357,000) | (556,000) |  |  |  |
Changes in pension plan assets and benefit obligations, Net-of-tax amount | (26,674,000) | (29,672,000) | (26,674,000) | (29,672,000) | $ 26,674,000 | $ 26,674,000 | $ 29,672,000 | $ 29,672,000
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | (811,000) | (556,000) | (811,000) | (556,000) | (922,000) | (454,000) | (507,000) | 0
Unrealized gains on available-for-sale securities, Net-of-tax amount | 41,685,000 | 17,614,000 | 41,685,000 | 17,614,000 | 41,457,000 | 17,539,000 | 3,872,000 | (20,116,000)
Total accumulated other comprehensive income (loss), Net-of-tax amount | 14,200,000 | (12,614,000) | 14,200,000 | (12,614,000) | $ 13,861,000 | $ (9,589,000) | $ (26,307,000) | $ (49,788,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 21,000 | (147,000) | (2,596,000) | 333,000 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (21,000) | (147,000) | 2,596,000 | (333,000) |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | $ 27,000 | $ 186,000 | $ (3,300,000) | 421,000 |  |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax |  |  |  | $ 24,200,000 |  |  |  |

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