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Stock Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Stock Compensation Plans |
Schedule of share-based compensation, stock options, activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Shares |  | Weighted
​ | ​ | Available | ​ | Under | ​ | Average
​ | ​ | to be Granted | ​ | Option | ​ | Exercise Price
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, January 1, 2022 | ​ | 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 be granted 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
Forfeited from terminated plan(s) | ​ | — | ​ | (15,634) | ​ | ​ | 51.289
Granted from 2022 Plan | ​ | (214,800) | ​ | 214,800 | ​ | ​ | 61.706
Exercised |  | — |  | (203,601) |  | ​ | 49.586
Forfeited from current plan(s) |  | 28,549 |  | (28,549) |  | ​ | 57.483
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, December 31, 2024 |  | 301,349 |  | 1,207,321 | ​ | $ | 55.921
Schedule of fair value option pricing model assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2024 |  | 2023 |  | 2022 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
Expected dividends per share | ​ | $ | 1.60 | ​ | $ | 1.60 | ​ | $ | 1.60 |
Risk-free interest rate |  | ​ | 4.31 | % | ​ | 4.51 | % | ​ | 3.77 | %
Expected life of options |  | ​ | 6 years | ​ | ​ | 6 years | ​ | ​ | 6 years | ​
Expected volatility |  | ​ | 25.48 | % | ​ | 23.69 | % | ​ | 23.70 | %
Weighted average fair value of options granted during year | ​ | $ | 15.01 | ​ | $ | 11.69 | ​ | $ | 13.46 | ​
Schedule of share-based compensation, activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | Average
​ | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | ​ | ​ | Exercise | ​ | Contractual
​ |  | Options |  | Price |  | Term
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding, January 1, 2024 |  | 1,240,305 | ​ | $ | 53.857 |  | 6.74 years
Granted |  | 214,800 | ​ | ​ | 61.706 |  | ​
Exercised |  | (203,601) | ​ | ​ | 49.586 |  | ​
Forfeited |  | (44,183) | ​ | ​ | 55.291 |  | ​
Options outstanding, December 31, 2024 |  | 1,207,321 | ​ | ​ | 55.921 |  | 6.80 years
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercisable, December 31, 2024 |  | 539,611 | ​ | $ | 53.798 |  | 4.63 years
Schedule of nonvested share activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | Weighted
​ | ​ | ​ | ​ | Average | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | Grant Date
​ |  | Options |  | Price |  | Fair Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nonvested options, January 1, 2024 |  | 668,815 | ​ | $ | 55.711 | ​ | $ | 11.640
Granted |  | 214,800 | ​ | ​ | 61.706 | ​ | ​ | 15.013
Vested this period |  | (176,580) | ​ | ​ | 55.582 | ​ | ​ | 11.002
Nonvested options forfeited |  | (39,325) | ​ | ​ | 56.320 | ​ | ​ | 12.113
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nonvested options, December 31, 2024 |  | 667,710 | ​ | $ | 57.638 | ​ | $ | 12.866
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, 2024: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
$41.300 to 41.740 |  | 149,610 |  | 4.74 years | ​ | $ | 41.632 |  | 113,686 | ​ | $ | 41.598
$50.710 to 59.750 |  | 551,814 |  | 6.24 years | ​ |  | 54.831 |  | 270,205 | ​ |  | 55.046
$60.150 to 61.790 |  | 505,897 |  | 8.02 years | ​ |  | 61.336 |  | 155,720 | ​ |  | 60.537
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 1,207,321 |  | 6.80 years | ​ | $ | 55.921 |  | 539,611 | ​ | $ | 53.798
​ ​

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