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Stock Compensation Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Stock Compensation Plans |
Schedule of Share-based Compensation, Stock Options, Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Shares |  | Weighted
​ | ​ | Available | ​ | Under | ​ | Average
​ | ​ | to Grant | ​ | Option | ​ | Exercise Price
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, January 1, 2019 | ​ | 614,850 | ​ | 773,236 | ​ | $ | 43.886
Granted from 2018 Plan |  | (186,400) |  | 186,400 |  | ​ | 60.086
Exercised |  | — |  | (125,894) |  | ​ | 33.031
Forfeited from terminated plan(s) |  | — |  | (17,424) |  | ​ | 44.163
Forfeited from current plan(s) |  | 8,450 |  | (8,450) |  | ​ | 55.000
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, December 31, 2019 |  | 436,900 |  | 807,868 |  | ​ | 49.139
Granted from 2018 Plan |  | (196,350) |  | 196,350 |  | ​ | 41.740
Exercised |  | — |  | (21,436) |  | ​ | 33.805
Forfeited from terminated plan(s) |  | — |  | (6,875) |  | ​ | 38.849
Forfeited from current plan(s) |  | 4,800 |  | (4,800) |  | ​ | 57.513
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, December 31, 2020 |  | 245,350 |  | 971,107 |  | ​ | 48.079
Granted from 2018 Plan |  | (202,700) |  | 202,700 |  | ​ | 57.980
Exercised |  | — |  | (91,285) |  | ​ | 40.532
Forfeited from terminated plan(s) |  | — |  | (5,197) |  | ​ | 44.563
Forfeited from current plan(s) |  | 44,022 |  | (44,022) |  | ​ | 52.256
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, December 31, 2021 |  | 86,672 |  | 1,033,303 | ​ | $ | 50.528
Schedule of Fair Value Option Pricing Model Assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
Expected dividends per share | ​ | $ | 1.44 | ​ | $ | 1.36 | ​ | $ | 1.36 |
Risk-free interest rate |  | ​ | 1.24 | % | ​ | 0.35 | % | ​ | 1.59 | %
Expected life of options |  | ​ | 5 years | ​ | ​ | 5 years | ​ | ​ | 5 years | ​
Expected volatility |  | ​ | 28.33 | % | ​ | 29.32 | % | ​ | 25.15 | %
Weighted average fair value of options granted during year | ​ | $ | 11.56 | ​ | $ | 7.30 | ​ | $ | 11.20 | ​
Schedule of Share-based Compensation, Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | Average
​ | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | ​ | ​ | Exercise | ​ | Contractual
​ |  | Options |  | Price |  | Term
​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding, January 1, 2021 |  | 971,107 | ​ | 48.079 |  | 7.23 years
Granted |  | 202,700 | ​ | 57.980 |  | ​
Exercised |  | (91,285) | ​ | 40.532 |  | ​
Forfeited |  | (49,219) | ​ | 51.444 |  | ​
Options outstanding, December 31, 2021 |  | 1,033,303 | ​ | 50.528 |  | 7.05 years
​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercisable, December 31, 2021 |  | 421,347 | ​ | 46.804 |  | 4.87 years
Schedule of Nonvested Share Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | Weighted
​ | ​ | ​ | ​ | Average | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | Grant Date
​ |  | Options |  | Price |  | Fair Value
​ | ​ | ​ | ​ | ​ | ​ | ​
Nonvested options, January 1, 2021 |  | 607,412 | ​ | 51,370 | ​ | 8.981
Granted |  | 202,700 | ​ | 57.980 | ​ | 11.560
Vested this period |  | (156,401) | ​ | 53.284 | ​ | 9.253
Nonvested options forfeited |  | (41,755) | ​ | 51.056 | ​ | 8.952
​ | ​ | ​ | ​ | ​ | ​ | ​
Nonvested options, December 31, 2021 |  | 611,956 | ​ | 53.091 | ​ | 9.768
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Options Outstanding |  |  |  |  | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | Options Exercisable
​ | ​ | ​ | ​ | Average | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Remaining | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | Number | ​ | Contractual | ​ | Exercise | ​ | Number | ​ | Exercise
Range of Exercise Prices |  | Outstanding |  | Term |  | Price |  | Exercisable |  | Price
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
$23.860 to 29.640 |  | 41,836 |  | 1.51 years | ​ | $ | 27.771 |  | 41,836 | ​ | $ | 27.771
$32.590 to 38.610 |  | 52,956 |  | 2.82 years | ​ |  | 33.072 |  | 52,956 | ​ |  | 33.072
$41.300 to 41.740 |  | 243,381 |  | 7.66 years | ​ |  | 41.618 |  | 67,231 | ​ |  | 41.300
$50.710 to 52.500 |  | 172,143 |  | 5.11 years | ​ |  | 51.677 |  | 140,026 | ​ |  | 51.580
$55.000 to 60.150 |  | 522,987 |  | 8.28 years | ​ |  | 57.883 |  | 119,298 | ​ |  | 57.071
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 1,033,303 |  | 7.05 years | ​ |  | 50.528 |  | 421,347 | ​ |  | 46.804

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