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Stock-Based Compensation Stock Option Awards Outstanding (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding 231,625 376,033
Outstanding Options, Weighted Average Remaining Contractual Term 3 years 36 days 3 years 6 months 39 days
Outstanding Options, Weighted Average Exercise Price $ 18.88 $ 18.89
Options Exercisable 231,625 376,033
Exercisable Options, Weighted Average Exercise Price $ 18.88 $ 18.89
Option Range 1 Of Exercise Prices [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise Price Range, Lower Range Limit 15.17 15.17
Exercise Price Range, Upper Range Limit $ 16.54 $ 16.54
Options Outstanding 54,625 84,250
Outstanding Options, Weighted Average Remaining Contractual Term 3 years 4 years
Outstanding Options, Weighted Average Exercise Price $ 15.68 $ 15.74
Options Exercisable 54,625 84,250
Exercisable Options, Weighted Average Exercise Price $ 15.68 $ 15.74
Option Range 2 Of Exercise Prices [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise Price Range, Lower Range Limit 16.55 16.55
Exercise Price Range, Upper Range Limit $ 17.58 $ 17.63
Options Outstanding 36,000 89,833
Outstanding Options, Weighted Average Remaining Contractual Term 5 years 182 days 3 years 6 months 39 days
Outstanding Options, Weighted Average Exercise Price $ 16.95 $ 17.23
Options Exercisable 36,000 89,833
Exercisable Options, Weighted Average Exercise Price $ 16.95 $ 17.23
Option Range 3 Of Exercise Prices [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise Price Range, Lower Range Limit 17.59 17.64
Exercise Price Range, Upper Range Limit $ 20.20 $ 20.20
Options Outstanding 54,000 61,500
Outstanding Options, Weighted Average Remaining Contractual Term 2 years 109 days 3 years 1 month 7 days
Outstanding Options, Weighted Average Exercise Price $ 18.16 $ 18.21
Options Exercisable 54,000 61,500
Exercisable Options, Weighted Average Exercise Price $ 18.16 $ 18.21
Option Range 4 Of Exercise Prices [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise Price Range, Lower Range Limit 20.21 20.21
Exercise Price Range, Upper Range Limit $ 22.21 $ 22.17
Options Outstanding 51,000 79,250
Outstanding Options, Weighted Average Remaining Contractual Term 1 year 146 days 2 years 4 months 26 days
Outstanding Options, Weighted Average Exercise Price $ 21.84 $ 21.84
Options Exercisable 51,000 79,250
Exercisable Options, Weighted Average Exercise Price $ 21.84 $ 21.84
Option Range 5 Of Exercise Prices [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise Price Range, Lower Range Limit 22.22 22.18
Exercise Price Range, Upper Range Limit $ 22.57 $ 22.57
Options Outstanding 36,000 61,200
Outstanding Options, Weighted Average Remaining Contractual Term 4 years 146 days 5 years 4 months 26 days
Outstanding Options, Weighted Average Exercise Price $ 22.57 $ 22.55
Options Exercisable 36,000 61,200
Exercisable Options, Weighted Average Exercise Price $ 22.57 $ 22.55