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Share-Based Compensation Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-Based Compensation      
Vesting period 3 years    
Weighted Average Fair Value      
Unrecognized compensation expense related to non-vested restricted stock awards $ 6,119    
Weighted average period expected for recognition of compensation expense related to non-vested restricted stock awards 1 year 6 months    
Total fair value of the shares that were vested and unrestricted during the period $ 7,784 $ 4,413 $ 3,387
Compensation Expense, Net of Tax 4,764 5,197 3,358
Income tax benefits from compensation expense $ 1,266 $ 1,382 $ 1,808
Performance-based Shares Under Restriction      
Share-Based Compensation      
Vesting period 3 years    
Shares Under Restriction      
Outstanding at beginning of year (in shares) 105,170 105,660 94,610
Granted (in shares) 63,447 31,832 29,829
Vested and unrestricted (in shares) (84,512) (27,801) (18,259)
Forfeited (in shares)   (4,521) (520)
Outstanding at end of period (in shares) 84,105 105,170 105,660
Weighted Average Fair Value      
Outstanding at beginning of year (in dollars per share) $ 66.79 $ 62.75 $ 57.60
Granted (in dollars per share) 69.61 75.14 74.96
Vested and unrestricted (in dollars per share) 56.42 61.50 53.99
Forfeited (in dollars per share)   62.41 53.99
Outstanding at end of period (in dollars per share) $ 79.34 $ 66.79 $ 62.75
Performance-based Shares Under Restriction | Minimum      
Share-Based Compensation      
Actual Payouts (as a percent) 0.00%    
Performance-based Shares Under Restriction | Maximum      
Share-Based Compensation      
Actual Payouts (as a percent) 200.00%    
Restricted Stock      
Shares Under Restriction      
Outstanding at beginning of year (in shares) 89,135 93,086 95,493
Granted (in shares) 33,778 39,451 40,226
Vested and unrestricted (in shares) (44,085) (43,276) (42,453)
Forfeited (in shares) (626) (126) (180)
Outstanding at end of period (in shares) 78,202 89,135 93,086
Weighted Average Fair Value      
Outstanding at beginning of year (in dollars per share) $ 68.70 $ 63.13 $ 55.86
Granted (in dollars per share) 92.52 75.05 73.42
Vested and unrestricted (in dollars per share) 68.41 62.46 56.56
Forfeited (in dollars per share) 75.50 70.63 63.87
Outstanding at end of period (in dollars per share) $ 79.09 $ 68.70 $ 63.13
Restricted Stock | Executives and non-executives (2018 and after)      
Share-Based Compensation      
Vesting period 5 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%