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Stock Based Compensation Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 355,651
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 5 years 7 months 1 day
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 22.52
Number of Shares Outstanding, Exercisable Options, in shares | shares 224,039
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 4 years 17 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 21.40
Exercise Price Range $18.71 to $19.48 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 51,254
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 1 year 8 months 15 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 18.32
Number of Shares Outstanding, Exercisable Options, in shares | shares 51,254
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 1 year 8 months 15 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 18.32
Exercise Price Range $20.82 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 40,305
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 3 years 28 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 20.78
Number of Shares Outstanding, Exercisable Options, in shares | shares 40,305
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 3 years 28 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 20.78
Exercise Price Range $21.83 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 100,747
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 4 years 6 months 28 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 22.46
Number of Shares Outstanding, Exercisable Options, in shares | shares 98,555
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 4 years 6 months 22 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 22.46
Exercise Price Range $23.30 to $23.95 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 59,912
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 7 years 20 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 23.33
Number of Shares Outstanding, Exercisable Options, in shares | shares 25,134
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 7 years 2 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 23.33
Exercise Price Range $24.51 to $25.27 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares Outstanding, Outstanding Options, in shares | shares 103,433
Weighted-Average Remaining Contractual Life, Outstanding Options, in years 8 years 7 months 8 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price | $ / shares $ 24.87
Number of Shares Outstanding, Exercisable Options, in shares | shares 8,791
Weighted-Average Remaining Contractual Life, Exercisable Options, in years 8 years 28 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price | $ / shares $ 24.61