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Employee Benefit Plans (Activity under the incentive and non-qualified stock option plans) (Details) - $ / shares
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]      
Balance, Beginning of Period, Shares 4,500 21,500 29,500
Options Granted, Shares 0 0 0
Options Exercised, Shares 450 7,500 0
Options Forfeited, Shares 4,050 9,500 8,000
Balance, End of Period, Shares 0 4,500 21,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Balance, Beginning of Period, Weighted Avg. Exercise Price $ 22.91 $ 23.57 $ 23.55
Options Granted, Weighted Avg. Exercise Price 0 0 0
Options Exercised, Weighted Avg. Exercise Price 22.91 23.49 0
Options Forfeited, Weighted Avg. Exercise Price 22.91 23.95 23.47
Balance, End of Period, Weighted Avg. Exercise Price $ 0.00 $ 22.91 $ 23.57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options Exercisable, Shares 0 4,500 18,200
Options Exercisable, Weighted Avg. Exercise Price $ 0.00 $ 22.91 $ 23.62
Weighted-Average Remaining Life of Exercisable Options   5 months 1 year
Options Available for Grant 0 50,000 50,000