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Stock-Based Compensation Plans (Schedule of Stock Options Activity) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of shares      
Outstanding, beginning of period, shares 5,800 12,300  
Options granted, shares 0 0  
Options exercised, shares 0 0  
Options forfeited or expired, shares 0 (6,500)  
Outstanding, end of period, shares 5,800 5,800 12,300
Options, exerciseable, end of period, shares 5,800    
Weighted-average exercise price per share      
Outstanding, beginning of period, weighted-average exercise price per share (in USD per share) $ 13.00 $ 10.89  
Options granted, weighted-average exercise price per share (in USD per share) 0.00 0.00  
Options exercised, weighted-average exercise price per share (in USD per share) 0.00 0.00  
Options forfeited or expired, weighted-average exercise price per share (in USD per share) 0.00 9.00  
Outstanding, end of period, weighted-average exercise price per share (in USD per share) 13.00 $ 13.00 $ 10.89
Exercisable, end of period, weighted-average exercise price per share (in USD per share) $ 13.00    
Outstanding, end of period, weighted-average remaining contractual term 10 months 15 days 1 year 10 months 15 days 1 year 7 months 15 days
Exercisable, end of period, weighted-average remaining contractual term 10 months 15 days    
Outstanding, end of period, aggregate intrinsic value $ 0 $ 0 $ 2,320
Exercisable, end of period, aggregate intrinsic value $ 0