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Stock Incentive Plan Summary of Stock Option Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning of year 10,500 40,500 45,500
Granted 0 0 0
Exercised (10,500) (27,500) (2,500)
Forfeited or expired 0 (2,500) (2,500)
Outstanding, end of year 0 10,500 40,500
Options, Exercisable, Number 0 10,500 40,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Outstanding Options, Weighted Average Exercise Price, Beginning of Year $ 23.00 $ 24.65 $ 24.67
Options, Grants in Period, Weighted Average Exercise Price 0 0.00 0.00
Options, Exercises in Period, Weighted Average Exercise Price 23.00 25.42 24.86
Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price 0.00 23.00 24.86
Outstanding Options, Weighted Average Exercise Price, End of Year 0.00 23.00 24.65
Options, Exercisable, Weighted Average Exercise Price $ 0.00 $ 23.00 $ 24.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options, Outstanding, Weighted Average Remaining Contractual Term 0 years 350 days 1 year 153 days
Options, Exercisable, Weighted Average Remaining Contractual Term 0 years 350 days 1 year 153 days
Options, Outstanding, Intrinsic Value $ 0 $ 163,170 $ 378,850
Options, Exercisable, Intrinsic Value 0 163,170 $ 378,850
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 176,000 $ 259,000  
Antidilutive Outstanding option shares     14,000