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Stock Options and Stock Appreciation Rights (Tables) | 12 Months Ended
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Dec. 31, 2023
Stock Options and Stock Appreciation Rights |
Schedule of Black-Scholes-Merton option valuation model assumptions | ​
​ | ​ | ​ | ​
​ |  | 2022 |
Expected Life (Years) |  | 7.00 | ​
Dividend yield |  | 3.08 | %
Interest rate |  | 1.94 | %
Volatility |  | 37.78 | %
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, 2022 |  | 461,822 | ​ | $ | 29.67 | ​ | ​ | ​ | ​ | ​ | ​
Plus: Options granted |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | (46,444) | ​ |  | 25.12 | ​ | ​ | ​ | ​ | ​ | ​
Options expired |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | (31,513) | ​ |  | 24.52 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at December 31, 2023 |  | 383,865 | ​ |  | 30.65 |  | 3.42 | ​ | $ | 9,088 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options fully vested and exercisable at December 31, 2023 |  | 232,143 | ​ | $ | 27.80 |  | 1.96 | ​ | $ | 6,157 | ​
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)
Stock appreciation rights outstanding at December 31, 2022 |  | 489,250 | ​ | $ | 39.35 | ​ | ​ | ​ | ​ | ​
Plus: Stock appreciation rights granted |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock appreciation rights exercised |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Stock appreciation rights expired |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Stock appreciation rights forfeited |  | (24,000) | ​ | ​ | 39.33 | ​ | ​ | ​ | ​ | ​
Stock appreciation rights outstanding at December 31, 2023 |  | 465,250 | ​ |  | 39.35 |  | 8.50 | ​ | ​ | 6,964
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock appreciation rights fully vested and exercisable at December 31, 2023 |  | — | ​ | $ | — |  | ​ | ​ | ​ | ​
Schedule of other information pertaining to option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Twelve Months Ended December 31, |
​ | ​ | 2023 | ​ | 2022 | ​ | 2021 |
Weighted average grant date fair value of stock options granted |  | $ | — |  | $ | 11.24 |  | $ | 10.20 | ​
Total fair value of stock options vested | ​ | $ | 514,000 | ​ | $ | 514,000 | ​ | $ | 1,308,000 | ​
Total intrinsic value of stock options exercised | ​ | $ | 1,060,000 | ​ | $ | 1,670,000 | ​ | $ | 2,536,000 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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