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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred income tax - unrealized gains (losses) on available for sale securities |  | $ (2,379) | $ 321 |
Deferred income tax - pension adjustments |  | (5) | 668 |
Change in net deffered tax asset |  |  | 159 |
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 |  | 1,814 | $ 8,485 |
Reduce the corporate tax rate |  |  | 21.00% |
Prior maximum effective rate |  |  | 35.00% |
Tax benefit | $ 1,300 | $ 24,189 | $ 21,767 | $ 14,624

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