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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred income tax - unrealized gains (losses) on available for sale securities |  | $ 321 | $ (685) |
Deferred income tax - pension adjustments |  | 668 | (36) |
Change in net deffered tax asset |  | 4,146 |  |
Pre-1988 tax bad debt reserve |  | $ 6,869 | 6,869 |
State income tax rate effective (as a percent) |  | 3.00% |  |
Increase decrease in deferred income tax expense |  | $ 8,485 | 118 |
Reduce the corporate tax rate |  | 21.00% |  |
Prior maximum effective rate |  | 35.00% |  |
Tax benefit | $ 1,300 | $ 21,767 | $ 14,624 | $ 14,126
Minimum [Member] |  |  |  |
Tax benefit | 1,000 |  |  |
Maximum [Member] |  |  |  |
Tax benefit | $ 1,500 |  |  |

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