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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Allocation of Recognized Compensation Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 2022 |  | 2021
Stock options | ​ | $ | — | ​ | $ | — | ​ | $ | —
Restricted stock awards | ​ | ​ | 868 | ​ | ​ | 578 | ​ | ​ | 357
Performance stock units | ​ |  | 857 | ​ |  | 181 | ​ |  | 317
Restricted stock units | ​ |  | 800 | ​ |  | 1,098 | ​ |  | 1,391
Total compensation expense | ​ | $ | 2,525 | ​ | $ | 1,857 | ​ | $ | 2,065
Schedule of Tax Benefits Recognized | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 2022 |  | 2021
Stock options(1) | ​ | $ | 17 | ​ | $ | 22 | ​ | $ | 77
Restricted stock awards | ​ | ​ | 201 | ​ | ​ | 136 | ​ | ​ | 84
Performance stock units | ​ |  | 204 | ​ |  | 43 | ​ |  | 79
Restricted stock units | ​ |  | 193 | ​ |  | 274 | ​ |  | 344
Total tax benefit | ​ | $ | 615 | ​ | $ | 475 | ​ | $ | 584
​ (1) We do not receive a tax benefit on this plan until disqualifying dispositions are made.
Summary of Stock Option Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted | ​ | Aggregate
​ | ​ | Stock Options | ​ | Average | ​ | Intrinsic Value
Stock Options |  | Outstanding |  | Exercise Price |  | (in thousands)
Outstanding at January 1, 2023 |  | 47,327 | ​ | $ | 21.47 |  | ​ |
Granted |  | — | ​ |  | — |  | ​ |
Exercised |  | (8,166) | ​ |  | 20.64 |  | ​ |
Forfeited |  | — | ​ |  | — |  | ​ |
Expired | ​ | (3,323) | ​ | ​ | 16.99 | ​ | ​ | ​
Outstanding at December 31, 2023 |  | 35,838 | ​ | $ | 22.08 | ​ | $ | 261
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending vested and expected to vest December 31, 2023 |  | 35,838 | ​ | $ | 22.08 | ​ | $ | 261
Exercisable at December 31, 2023 |  | 35,838 | ​ |  | 22.08 | ​ |  | 261
​ ​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted | ​ | Aggregate
​ | ​ | Stock Options | ​ | Average | ​ | Intrinsic Value
Stock Options |  | Outstanding |  | Exercise Price |  | (in thousands)
Outstanding at January 1, 2022 |  | 57,964 | ​ | $ | 20.89 |  | ​ |
Granted |  | — | ​ |  | — |  | ​ |
Exercised |  | (10,637) | ​ |  | 18.29 |  | ​ |
Forfeited |  | — | ​ |  | — |  | ​ |
Expired | ​ | — | ​ | ​ | — | ​ | ​ | ​
Outstanding at December 31, 2022 |  | 47,327 | ​ | $ | 21.47 | ​ | $ | 500
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending vested and expected to vest December 31, 2022 |  | 47,327 | ​ | $ | 21.47 | ​ | $ | 500
Exercisable at December 31, 2022 |  | 47,327 | ​ |  | 21.47 | ​ |  | 500
Summary of Restricted Stock Awards Activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | ​ | ​
​ | ​ | Restricted Stock | ​ | Weighted Average
​ | ​ | Awards | ​ | Grant Date Fair
Restricted Stock Awards |  | Outstanding |  | Value
Outstanding at January 1, 2023 |  | 24,824 | ​ | $ | 28.49
Awarded |  | 39,585 | ​ |  | 29.16
Vested |  | (23,235) | ​ |  | 27.36
Forfeited |  | — | ​ |  | —
Outstanding at December 31, 2023 |  | 41,174 | ​ | $ | 29.78
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | ​ | ​
​ | ​ | Restricted Stock | ​ | Weighted Average
​ | ​ | Awards | ​ | Grant Date Fair
Restricted Stock Awards |  | Outstanding |  | Value
Outstanding at January 1, 2022 |  | — | ​ | $ | —
Awarded |  | 39,267 | ​ |  | 29.21
Vested |  | (14,443) | ​ |  | 30.46
Forfeited |  | — | ​ |  | —
Outstanding at December 31, 2022 |  | 24,824 | ​ | $ | 28.49
Performance stock units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Stock Units Activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Average
​ | ​ | Performance Stock | ​ | Grant Date Fair
Performance Stock Units |  | Units Outstanding |  | Value
Nonvested at January 1, 2023 |  | 78,435 | ​ | $ | 25.70
Awarded |  | 28,831 | ​ |  | 30.64
Vested and exercised |  | (15,601) | ​ |  | 25.29
Forfeited |  | (6,750) | ​ |  | 25.30
Nonvested at December 31, 2023 |  | 84,915 | ​ | $ | 27.53
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Average
​ | ​ | Performance Stock | ​ | Grant Date Fair
Performance Stock Units |  | Units Outstanding |  | Value
Nonvested at January 1, 2022 |  | 70,465 | ​ | $ | 23.88
Awarded |  | 29,200 | ​ |  | 28.49
Vested and exercised |  | — | ​ |  | —
Forfeited |  | (21,230) | ​ |  | 23.35
Nonvested at December 31, 2022 |  | 78,435 | ​ | $ | 25.70
Restricted stock units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Stock Units Activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Average
​ | ​ | Restricted Stock | ​ | Grant Date Fair
​ |  | Units Outstanding |  | Value
Outstanding at January 1, 2023 | ​ | 115,816 |  | $ | 25.25
Granted | ​ | 36,354 | ​ | ​ | 26.12
Vested and exercised | ​ | (43,341) | ​ | ​ | 21.77
Forfeited | ​ | (6,134) | ​ | ​ | 25.84
Outstanding at December 31, 2023 | ​ | 102,695 | ​ | $ | 27.07
​ ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Average
​ | ​ | Restricted Stock | ​ | Grant Date Fair
​ |  | Units Outstanding |  | Value
Outstanding at January 1, 2022 | ​ | 133,617 |  | $ | 23.48
Granted | ​ | 36,468 | ​ | ​ | 28.51
Vested and exercised | ​ | (43,059) | ​ | ​ | 22.88
Forfeited | ​ | (11,210) | ​ | ​ | 23.46
Outstanding at December 31, 2022 | ​ | 115,816 | ​ | $ | 25.25

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