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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