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Stock-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares        
Outstanding, beginning of period (in shares) 283,686 327,270 350,186  
Granted (in shares) 0 0 32,750  
Exercised (in shares) (56,352) (38,250) (55,666)  
Canceled/Forfeited (in shares) (8,000) (5,534)    
Expired (in shares) (11,000)      
Outstanding, end of period (in shares) 208,334 283,686 327,270 350,186
Exercisable (in shares) 197,901      
Weighted Average Grant Date Fair Value        
Outstanding, beginning of period (in dollars per share) $ 20.46 $ 20.21 $ 19.45  
Granted (in dollars per share) 0 0 28.15  
Exercised (in dollars per share) 8.97 17.19 20.12  
Canceled/Forfeited, weighted average exercise price (in dollars per share) 21.60 24.02    
Expired (in dollars per share) 17.74      
Outstanding, end of period (in dollars per share) 23.67 $ 20.46 $ 20.21 $ 19.45
Exercisable (in dollars per share) $ 23.43      
Weighted Average Remaining Contractual Life (years)        
Outstanding, weighted average remaining contractual life 3 years 7 months 28 days 3 years 6 months 29 days 4 years 3 months 10 days 4 years 3 months
Exercisable, weighted average remaining contractual life 3 years 5 months 23 days      
Aggregate Intrinsic Value        
Outstanding, aggregate intrinsic value $ 0 $ 434 $ 2,255 $ 4,453
Exercised, aggregate intrinsic value 474 $ 216 $ 446  
Exercisable, aggregate intrinsic value $ 0