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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  |  | $ 2,562 |  |  |  |  |
Other comprehensive loss before reclassifications | $ (2,368) | $ 3,011 | (25,778) | $ 4,033 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 0 | 0 | (3,175) | 0 |  |  |  |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax | 0 | 0 | (2,024) | 0 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | (2,024) | 0 |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | (2,368) | 3,011 |  | 4,033 |  |  |  |
Other comprehensive income (loss) | (2,368) | 3,011 | (23,754) | 4,033 |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax | (2,368) | 3,011 | (25,778) | 4,033 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax |  | 0 | 0 | 0 |  |  |  |
Changes in pension plan assets and benefit obligations, Net-of-tax amount | (26,701) | (14,740) | (26,701) | (14,740) | $ 26,701 | $ 23,526 | $ 14,740 | $ 14,740
Unrealized gains on available-for-sale securities, Net-of-tax amount | (28,308) | 1,028 | (28,308) | 1,028 | (25,940) | (2,928) | (1,983) | (3,005)
Total accumulated other comprehensive income (loss), Net-of-tax amount | (55,009) | $ (13,712) | (55,009) | (13,712) | $ (52,641) | (26,454) | $ (16,723) | $ (17,745)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax |  |  |  | $ 0 |  |  |  |
Accumulated Other Comprehensive Income (loss) [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  | (3,806) |  |
Accumulated Other Comprehensive Income (loss) [Member] | Pension Plan [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  | (3,175) |  |
Accumulated Other Comprehensive Income (loss) [Member] | Debt Securities [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  | (631) |  |
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss) | $ (2,368) |  | (28,555) |  |  |  |  |
Accounting Standards Update 2016-01 [Member] | Debt Securities [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax |  |  | $ (25,380) |  |  |  |  |
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income (loss) [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  | $ (995) |  |

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