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Share-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-Based Compensation Plans |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ |  | Shares |  | Price |  | Term (Years) |  | Value*
Outstanding at December 31, 2023 |  | 967,217 | ​ | $ | 26.22 |  |  |  | ​ |
Granted |  | — | ​ | ​ | — |  |  |  | ​ |
Exercised |  | (49,962) | ​ | ​ | 24.44 |  |  |  | ​ |
Forfeited or expired |  | (5,880) | ​ | ​ | 25.05 |  |  |  | ​ |
Outstanding at June 30, 2024 |  | 911,375 | ​ | $ | 26.32 |  | 6.3 | ​ | $ | 4,440,000
Exercisable at June 30, 2024 |  | 480,188 | ​ | $ | 27.54 |  | 4.9 | ​ | $ | 2,128,000
​ *The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the market value of our common stock on June 28, 2024, the last trading day of the quarter, of $30.32 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.
Schedule of restricted stock award activity |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | ​ | ​ |  | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ | ​
​ | ​ | Shares of | ​ | Average | ​ | Remaining | ​ | ​ | Aggregate | ​
​ | ​ | Restricted | ​ | Grant Date | ​ | Contractual | ​ | ​ | Intrinsic | ​
​ | ​ | Stock | ​ | Fair Value | ​ | Term (Years) | ​ | ​ | Value* | ​
Non-vested - December 31, 2023 |  | 69,090 | ​ | $ | 25.54 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Issued |  | — | ​ |  | — | ​ |  | ​ | ​ |  | ​ | ​
Vested |  | (1,425) | ​ |  | 24.85 | ​ |  | ​ | ​ |  | ​ | ​
Forfeited |  | — | ​ |  | — | ​ |  | ​ | ​ |  | ​ | ​
Non-vested - June 30, 2024 |  | 67,665 | ​ | $ | 25.55 | ​ | 2.2 | ​ | ​ | $ | 2,052,000 | ​
​ *The aggregate intrinsic value of non-vested restricted stock was calculated using the market value of our common stock on June 28, 2024, the last trading day of the quarter, of $30.32 multiplied by the number of non-vested restricted shares outstanding.

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