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Stock Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Stock Compensation Plans |
Schedule of share-based compensation, stock options, activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Shares |  | Weighted
​ | ​ | Available | ​ | Under | ​ | Average
​ | ​ | to Grant | ​ | Option | ​ | Exercise Price
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, January 1, 2021 | ​ | 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 |  | 900,000 |  | — |  | ​ | —
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 |  | 694,850 |  | 1,064,917 |  | ​ | 53.671
Forfeited from terminated plan(s) | ​ | — | ​ | (9,100) | ​ | ​ | 51.123
Granted from 2022 Plan | ​ | (210,300) | ​ | 210,300 | ​ | ​ | 53.166
Exercised |  | — |  | (22,762) |  | ​ | 38.830
Forfeited from current plan(s) |  | 3,050 |  | (3,050) |  | ​ | 61.550
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, December 31, 2023 |  | 487,600 |  | 1,240,305 | ​ | $ | 53.857
Schedule of fair value option pricing model assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
Expected dividends per share | ​ | $ | 1.60 | ​ | $ | 1.60 | ​ | $ | 1.44 |
Risk-free interest rate |  | ​ | 4.51 | % | ​ | 3.77 | % | ​ | 1.24 | %
Expected life of options |  | ​ | 6 years | ​ | ​ | 6 years | ​ | ​ | 5 years | ​
Expected volatility |  | ​ | 23.69 | % | ​ | 23.70 | % | ​ | 28.33 | %
Weighted average fair value of options granted during year | ​ | $ | 11.69 | ​ | $ | 13.46 | ​ | $ | 11.56 | ​
Schedule of share-based compensation, activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | Average
​ | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | ​ | ​ | Exercise | ​ | Contractual
​ |  | Options |  | Price |  | Term
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding, January 1, 2023 |  | 1,064,917 | ​ | $ | 53.671 |  | 7.13 years
Granted |  | 210,300 | ​ | ​ | 53.166 |  | ​
Exercised |  | (22,762) | ​ | ​ | 38.830 |  | ​
Forfeited |  | (12,150) | ​ | ​ | 53.741 |  | ​
Options outstanding, December 31, 2023 |  | 1,240,305 | ​ | ​ | 53.857 |  | 6.74 years
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercisable, December 31, 2023 |  | 571,490 | ​ | $ | 51.688 |  | 4.64 years
Schedule of nonvested share activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | Weighted
​ | ​ | ​ | ​ | Average | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | Grant Date
​ |  | Options |  | Price |  | Fair Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nonvested options, January 1, 2023 |  | 636,844 | ​ | $ | 56.073 | ​ | $ | 11.117
Granted |  | 210,300 | ​ | ​ | 53.166 | ​ | ​ | 11.681
Vested this period |  | (169,592) | ​ | ​ | 53.882 | ​ | ​ | 9.755
Nonvested options forfeited |  | (8,737) | ​ | ​ | 56.347 | ​ | ​ | 11.299
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nonvested options, December 31, 2023 |  | 668,815 | ​ | $ | 55.711 | ​ | $ | 11.640
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, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
$32.590 to 38.610 |  | 26,906 |  | 0.96 years | ​ | $ | 33.317 |  | 26,906 | ​ | $ | 33.317
$41.300 to 41.740 |  | 200,538 |  | 5.71 years | ​ |  | 41.628 |  | 119,930 | ​ |  | 41.552
$50.250 to 59.750 |  | 668,327 |  | 6.87 years | ​ |  | 54.686 |  | 316,725 | ​ |  | 54.194
$60.150 to 62.010 |  | 344,534 |  | 7.55 years | ​ |  | 60.971 |  | 107,929 | ​ |  | 60.176
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 1,240,305 |  | 6.74 years | ​ | $ | 53.857 |  | 571,490 | ​ | $ | 51.688
​

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