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Stock Options and Stock Appreciation Rights (Tables) | 12 Months Ended
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Dec. 31, 2025
Stock Options and Stock Appreciation Rights |
Summary of option activity under stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | ​ | ​ ​ ​ | ​ | ​ | ​ ​ ​ | Weighted | ​ ​ ​ | ​ ​ ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | average | ​ | remaining | ​ | Aggregate | ​
​ | ​ | Number of | ​ | exercise | ​ | contractual | ​ | intrinsic | ​
​ | ​ | options | ​ | price | ​ | term (years) | ​ | value ($) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (in Thousands) | ​
Options outstanding at December 31, 2024 |  | 212,155 | ​ | $ | 35.27 | ​ | ​ | ​ | ​ | ​ | ​
Plus: Options granted |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | (42,121) | ​ | ​ | 34.81 | ​ | ​ | ​ | ​ | ​ | ​
Options expired |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | (5,150) | ​ | ​ | 34.03 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at December 31, 2025 |  | 164,884 | ​ |  | 35.42 |  | 3.37 | ​ | $ | 5,115 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options fully vested and exercisable at December 31, 2025 |  | 122,733 | ​ | $ | 36.20 |  | 2.65 | ​ | $ | 3,711 | ​
Schedule of other information pertaining to option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Twelve Months Ended December 31, |
​ | ​ | 2025 | ​ | 2024 | ​ | 2023 |
Weighted average grant date fair value of stock options granted | ​ ​ ​ | $ | — | ​ ​ ​ | $ | — | ​ ​ ​ | $ | — | ​
Total fair value of stock options vested | ​ | $ | 478,000 | ​ | $ | 616,286 | ​ | $ | 514,000 | ​
Total intrinsic value of stock options exercised | ​ | $ | 1,314,000 | ​ | $ | 4,640,000 | ​ | $ | 1,060,000 | ​
Summary of activity under the SAR Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | ​ | ​ ​ ​ | ​ | ​ | ​ ​ ​ | Weighted | ​ ​ ​ | ​ ​ ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​
​ | ​ | Number of | ​ | average | ​ | remaining | ​ | Aggregate
​ | ​ | stock appreciation | ​ | exercise | ​ | contractual | ​ | intrinsic
​ | ​ | rights | ​ | price | ​ | term (years) | ​ | value ($)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (in Thousands)
SARs outstanding at December 31, 2024 |  | 456,702 | ​ | $ | 39.61 | ​ | ​ | ​ | ​ | ​
Plus: SARs granted |  | — | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
SARs exercised |  | (11,583) | ​ | ​ | 39.33 | ​ | ​ | ​ | ​ | ​
SARs expired |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
SARs forfeited |  | (18,376) | ​ | ​ | 39.33 | ​ | ​ | ​ | ​ | ​
SARs outstanding at December 31, 2025 |  | 426,743 | ​ |  | 39.63 | ​ | 6.54 | ​ | $ | 11,443
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
SARs fully vested and exercisable at December 31, 2025 |  | 62,811 | ​ | $ | 39.35 |  | 6.50 | ​ | $ | 1,701

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