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Share-Based Compensation Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Weighted Average Fair Value      
Unrecognized compensation expense related to non-vested restricted stock awards $ 6,455    
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition 1 year 9 months 18 days    
Total fair value of the shares that were vested and unrestricted during the period $ 3,732 $ 2,897 $ 3,554
Restricted Stock      
Shares Under Restriction      
Outstanding at beginning of year (in shares) 112,024 176,116 211,234
Granted (in shares) 46,556 46,943 50,781
Vested and unrestricted (in shares) (56,279) (108,130) (81,149)
Forfeited (in shares) (6,808) (2,905) (4,750)
Outstanding at end of year (in shares) 95,493 112,024 176,116
Weighted Average Fair Value      
Outstanding at beginning of year (in dollars per share) $ 54.44 $ 46.38 $ 43.51
Granted (in dollars per share) 56.09 61.57 53.94
Vested and unrestricted (in dollars per share) 53.43 44.51 43.80
Forfeited (in dollars per share) 50.02 49.94 44.46
Outstanding at end of period (in dollars per share) $ 55.86 $ 54.44 $ 46.38
Restricted Stock | Non-executives      
Share-Based Compensation      
Vesting period 5 years    
Restricted Stock | Executives      
Share-Based Compensation      
Vesting period 3 years    
Restricted Stock | First anniversary of grant date      
Share-Based Compensation      
Actual Payouts (as a percent) 30.00%    
Restricted Stock | Second anniversary of grant date      
Share-Based Compensation      
Actual Payouts (as a percent) 30.00%    
Restricted Stock | Third anniversary of grant date      
Share-Based Compensation      
Actual Payouts (as a percent) 40.00%    
Performance-based | Restricted Stock      
Share-Based Compensation      
Vesting period 3 years    
Shares Under Restriction      
Outstanding at beginning of year (in shares) 99,101 64,724 37,456
Granted (in shares) 44,626 37,722 29,903
Vested and unrestricted (in shares) (15,289)    
Forfeited (in shares) (33,828) (3,345) (2,635)
Outstanding at end of year (in shares) 94,610 99,101 64,724
Weighted Average Fair Value      
Outstanding at beginning of year (in dollars per share) $ 55.55 $ 50.40 $ 44.13
Granted (in dollars per share) 61.07 63.62 57.94
Vested and unrestricted (in dollars per share) 47.42    
Forfeited (in dollars per share) 52.07 46.91 46.96
Outstanding at end of period (in dollars per share) $ 57.60 $ 55.55 $ 50.40
Performance-based | Restricted Stock | Minimum      
Share-Based Compensation      
Actual Payouts (as a percent) 0.00%    
Performance-based | Restricted Stock | Maximum      
Share-Based Compensation      
Actual Payouts (as a percent) 200.00%