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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award |
Schedule of the company's stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​
​ | ​ | ​ | ​ | average | ​ | remaining | ​ | Aggregate
​ | ​ | ​ | ​ | exercise | ​ | contractual | ​ | intrinsic
​ | ​ | Shares | ​ | price | ​ | life in years | ​ | value
Outstanding at December 31, 2023 |  | 471,132 |  | $ | 17.92 | ​ | 4.9 |  | $ | 5,500,080
Options granted |  | — |  |  | — | ​ | ​ |  |  |
Options exercised |  | (80,633) |  |  | 15.22 | ​ |  |  |  | ​
Options forfeited |  | — |  | ​ | — | ​ |  |  |  |
Options expired |  | — |  | ​ | — | ​ |  |  |  |
Outstanding at September 30, 2024 |  | 390,499 |  | $ | 18.47 | ​ | 4.3 |  | $ | 6,087,186
Exercisable at September 30, 2024 | ​ | 390,499 |  | $ | 18.47 | ​ | 4.3 |  | $ | 6,087,186
Schedule of Information About Options Exercised | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30, | ​
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023 | ​
Number of options exercised |  | ​ | 15,533 | ​ | ​ | 22,249 | ​ |  | 80,633 |  |  | 73,184 | ​
Total intrinsic value of options exercised | ​ | $ | 304,943 | ​ | $ | 164,978 | ​ | $ | 1,109,805 |  | $ | 480,981 | ​
Cash received from options exercised | ​ | $ | 186,497 | ​ | $ | 394,665 | ​ | $ | 1,227,506 |  | $ | 1,393,551 | ​
Tax deduction realized from options | ​ | $ | 85,719 | ​ | $ | 49,634 | ​ | $ | 311,966 |  | $ | 144,703 | ​
Schedule of Stock Options, by Exercise Price Range | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Options outstanding | ​ | Options exercisable
​ |  | ​ | ​ | Weighted average |  | Weighted |  | ​ |  | Weighted
​ | ​ | Options | ​ | remaining contractual | ​ | average | ​ | Options | ​ | average
Range of exercise prices | ​ | outstanding | ​ | life (in years) | ​ | exercise price | ​ | exercisable | ​ | exercise price
8.31-11.87 |  | 47,000 | ​ | 1.1 | ​ | $ | 9.79 | ​ | 47,000 |  | $ | 9.79
11.88-15.44 |  | 9,000 | ​ | 2.2 | ​ |  | 14.60 | ​ | 9,000 |  |  | 14.60
15.45-19.01 |  | 127,599 | ​ | 4.9 | ​ |  | 17.57 | ​ | 127,599 |  |  | 17.57
19.02-22.57 |  | 206,900 | ​ | 4.8 | ​ |  | 21.17 | ​ | 206,900 |  |  | 21.17
Total |  | 390,499 | ​ | 4.3 | ​ | $ | 18.47 | ​ | 390,499 |  | $ | 18.47
Schedule of Nonvested Share Activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Average grant
​ | ​ | Shares | ​ | date fair value
Nonvested restricted stock at December 31, 2023 |  | 164,634 | ​ | $ | 24.46
Granted |  | 77,950 | ​ | ​ | 28.84
Cancelled |  | (7,162) | ​ | ​ | 26.83
Vested |  | (48,125) | ​ | ​ | 23.53
Nonvested restricted stock at September 30, 2024 |  | 187,297 | ​ | $ | 26.43
Schedule of Restricted Stock Grants | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30,
​ |  | 2024 |  | 2023 | ​ | 2024 |  | 2023
Number of shares granted |  | ​ | — | ​ | ​ | 3,000 | ​ | ​ | 77,950 | ​ | ​ | 58,500
Average grant date fair value | ​ | $ | — | ​ | $ | 25.24 | ​ | $ | 28.84 | ​ | $ | 22.93
Employee Stock Option [Member] |
Share-based Compensation Arrangement by Share-based Payment Award |
Schedule of allocation of Share-based Compensation Costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30, | ​
(In thousands) |  | 2024 |  | 2023 | ​ | 2024 |  | 2023 | ​
Compensation expense | ​ | $ | — | ​ | $ | 72 | ​ | $ | 32 | ​ | $ | 236 | ​
Income tax benefit | ​ | $ | — | ​ | $ | 21 | ​ | $ | 9 | ​ | $ | 68 | ​
Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award |
Schedule of allocation of Share-based Compensation Costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30, | ​
(In thousands) |  | 2024 |  | 2023 | ​ | 2024 |  | 2023 | ​
Compensation expense | ​ | $ | 455 | ​ | $ | 357 | ​ | $ | 1,349 | ​ | $ | 1,033 | ​
Income tax benefit | ​ | $ | 128 | ​ | $ | 103 | ​ | $ | 379 | ​ | $ | 298 | ​

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