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Stock Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Stock Compensation Plans |
Schedule of share-based compensation, stock options, activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Shares |  | Weighted
​ | ​ | Available | ​ | Under | ​ | Average
​ | ​ | to Grant | ​ | Option | ​ | Exercise Price
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, January 1, 2020 | ​ | 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
Granted from 2018 Plan |  | (2,500) |  | 2,500 |  | ​ | 61.550
Forfeited from terminated plan(s) | ​ | 39,235 | ​ | (39,235) | ​ | ​ | 52.523
Termination of 2018 Plan | ​ | (123,407) | ​ | — | ​ | ​ | —
Available to Grant from 2022 Plan | ​ | 800,000 | ​ | — | ​ | ​ | —
Granted from 2022 Plan | ​ | (205,900) | ​ | 205,900 | ​ | ​ | 61.505
Exercised |  | — |  | (136,801) |  | ​ | 42.149
Forfeited from current plan(s) |  | 750 |  | (750) |  | ​ | 61.550
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, December 31, 2022 |  | 594,850 |  | 1,064,917 | ​ | $ | 53.671
​
Schedule of fair value option pricing model assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
Expected dividends per share | ​ | $ | 1.60 | ​ | $ | 1.44 | ​ | $ | 1.36 |
Risk-free interest rate |  | ​ | 3.77 | % | ​ | 1.24 | % | ​ | 0.35 | %
Expected life of options |  | ​ | 6 years | ​ | ​ | 5 years | ​ | ​ | 5 years | ​
Expected volatility |  | ​ | 23.70 | % | ​ | 28.33 | % | ​ | 29.32 | %
Weighted average fair value of options granted during year | ​ | $ | 13.46 | ​ | $ | 11.56 | ​ | $ | 7.30 | ​
​
Schedule of share-based compensation, activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | Average
​ | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | ​ | ​ | Exercise | ​ | Contractual
​ |  | Options |  | Price |  | Term
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding, January 1, 2022 |  | 1,033,303 | ​ | $ | 50.528 |  | 7.05 years
Granted |  | 208,400 | ​ | ​ | 61.506 |  | ​
Exercised |  | (136,801) | ​ | ​ | 42.149 |  | ​
Forfeited |  | (39,985) | ​ | ​ | 52.692 |  | ​
Options outstanding, December 31, 2022 |  | 1,064,917 | ​ | ​ | 53.671 |  | 7.13 years
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercisable, December 31, 2022 |  | 428,073 | ​ | $ | 50.098 |  | 5.00 years
​
Schedule of nonvested share activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | Weighted
​ | ​ | ​ | ​ | Average | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | Grant Date
​ |  | Options |  | Price |  | Fair Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nonvested options, January 1, 2022 |  | 611,956 | ​ | $ | 53.091 | ​ | $ | 9.768
Granted |  | 208,400 | ​ | ​ | 61.506 | ​ | ​ | 13.317
Vested this period |  | (147,716) | ​ | ​ | 52.100 | ​ | ​ | 9.148
Nonvested options forfeited |  | (35,796) | ​ | ​ | 53.125 | ​ | ​ | 9.798
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nonvested options, December 31, 2022 |  | 636,844 | ​ | $ | 56.073 | ​ | $ | 11.117
​
Schedule of share-based compensation arrangement by share-based payment award, options, vested and expected to vest, exercisable | The following table further summarizes information about stock options outstanding at December 31, 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 |  | 9,977 |  | 0.85 years | ​ | $ | 28.714 |  | 9,977 | ​ | $ | 28.714
$32.590 to 38.610 |  | 27,981 |  | 1.96 years | ​ |  | 33.289 |  | 27,981 | ​ |  | 33.289
$41.300 to 41.740 |  | 210,423 |  | 6.80 years | ​ |  | 41.630 |  | 86,383 | ​ |  | 41.473
$50.710 to 59.750 |  | 467,102 |  | 6.61 years | ​ |  | 55.388 |  | 234,308 | ​ |  | 53.218
$60.150 to 62.010 |  | 349,434 |  | 8.61 years | ​ |  | 60.972 |  | 69,424 | ​ |  | 60.150
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 1,064,917 |  | 7.13 years | ​ | $ | 53.671 |  | 428,073 | ​ | $ | 50.098

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