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Stock-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Stock Based Compensation [Abstract]    
Options, beginning of year 208,700  
Options, Granted 0  
Options, Exercised (6,150)  
Options, Forfeited 0  
Options, end of year 202,550 208,700
Options, Exercisable, end of period 173,650  
Weighted Average Exercise Price Per Share, Outstanding, beginning of period $ 22.54  
Weighted Average Exercise Price Per Share, Granted  
Weighted Average Exercise Price Per Share, Exercised 18.31  
Weighted Average Exercise Price Per Share, Forfeited 0.00  
Weighted Average Exercise Price Per Share, Outstanding, end of period 22.67 $ 22.54
Weighted Average Exercise Price Per Share, Exercisable, end of period $ 21.06  
Weighted Average Remaining Contractual Term, Outstanding 5 years 8 months 12 days 5 years 10 months 24 days
Weighted Average Remaining Contractual Term, Exercised During Period 4 years 8 months 12 days  
Weighted Average Remaining Contractual Term, Exercisable at End of Period 5 years  
Aggregate Intrinsic Value, Outstanding, beginning of period $ 2,183  
Aggregate Intrinsic Value, Granted in Period 0  
Aggregate Intrinsic Value, Exercised in Period 113  
Aggregate Intrinsic Value, Forfeited in Period 0  
Aggregate Intrinsic Value, Outstanding, end of period 1,761 $ 2,183
Aggregate Intrinsic Value, Exercisable at end of period $ 1,761