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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Allocation of Recognized Compensation Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2021 |  | 2020 |  | 2019
Stock options | ​ | $ | — | ​ | $ | 12 | ​ | $ | 28
Restricted stock awards | ​ | ​ | 357 | ​ | ​ | 275 | ​ | ​ | 300
Performance stock units | ​ |  | 317 | ​ |  | 225 | ​ |  | 182
Restricted stock units | ​ |  | 1,391 | ​ |  | 960 | ​ |  | 841
Total compensation expense | ​ | $ | 2,065 | ​ | $ | 1,472 | ​ | $ | 1,351
Schedule of Tax Benefits Recognized | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2021 |  | 2020 |  | 2019
Stock options(1) | ​ | $ | 77 | ​ | $ | 9 | ​ | $ | 23
Restricted stock awards | ​ | ​ | 84 | ​ | ​ | 65 | ​ | ​ | 72
Performance stock units | ​ |  | 79 | ​ |  | 49 | ​ |  | 56
Restricted stock units | ​ |  | 344 | ​ |  | 190 | ​ |  | 198
Total tax benefit | ​ | $ | 584 | ​ | $ | 313 | ​ | $ | 349
​ (1) The Company does 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, 2021 |  | 94,566 | ​ | $ | 20.29 |  | ​ |
Granted |  | — | ​ |  | — |  | ​ |
Exercised |  | (36,441) | ​ |  | 19.38 |  | ​ |
Forfeited |  | — | ​ |  | — |  | ​ |
Expired | ​ | (161) | ​ | ​ | 13.27 | ​ | ​ | ​
Outstanding at December 31, 2021 |  | 57,964 | ​ | $ | 20.89 | ​ | $ | 466
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending vested and expected to vest December 31, 2021 |  | 57,964 | ​ | $ | 20.89 | ​ | $ | 466
Exercisable at December 31, 2021 |  | 57,962 | ​ |  | 20.89 | ​ |  | 466
​ ​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted | ​ | Aggregate
​ | ​ | Stock Options | ​ | Average | ​ | Intrinsic Value
Stock Options |  | Outstanding |  | Exercise Price |  | (in thousands)
Outstanding at January 1, 2020 |  | 107,784 | ​ | $ | 20.15 |  | ​ |
Granted |  | — | ​ |  | — |  | ​ |
Exercised |  | (9,860) | ​ |  | 18.42 |  | ​ |
Forfeited |  | (483) | ​ |  | 16.96 |  | ​ |
Expired | ​ | (2,875) | ​ | ​ | 21.90 | ​ | ​ | ​
Outstanding at December 31, 2020 |  | 94,566 | ​ | $ | 20.29 | ​ | $ | 226
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending vested and expected to vest December 31, 2020 |  | 94,566 | ​ | $ | 20.29 | ​ | $ | 226
Exercisable at December 31, 2020 |  | 92,956 | ​ |  | 20.35 | ​ |  | 217
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, 2021 |  | — | ​ | $ | —
Awarded |  | 11,418 | ​ |  | 31.29
Vested |  | (11,418) | ​ |  | 31.29
Forfeited |  | — | ​ |  | —
Outstanding at December 31, 2021 |  | — | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | ​ | ​
​ | ​ | Restricted Stock | ​ | Weighted Average
​ | ​ | Awards | ​ | Grant Date Fair
Restricted Stock Awards |  | Outstanding |  | Value
Outstanding at January 1, 2020 |  | — | ​ | $ | —
Awarded |  | 39,565 | ​ |  | 23.59
Vested |  | (39,565) | ​ |  | 23.59
Forfeited |  | — | ​ |  | —
Outstanding at December 31, 2020 |  | — | ​ | $ | —
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, 2021 |  | 56,328 | ​ | $ | 24.98
Awarded |  | 33,083 | ​ |  | 23.18
Vested and exercised |  | (7,694) | ​ |  | 26.79
Forfeited |  | (11,252) | ​ |  | 25.33
Nonvested at December 31, 2021 |  | 70,465 | ​ | $ | 23.88
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Average
​ | ​ | Performance Stock | ​ | Grant Date Fair
Performance Stock Units |  | Units Outstanding |  | Value
Nonvested at January 1, 2020 |  | 43,058 | ​ | $ | 26.01
Awarded |  | 25,041 | ​ |  | 25.07
Vested and exercised |  | (10,369) | ​ |  | 18.51
Forfeited |  | (1,402) | ​ |  | 29.13
Nonvested at December 31, 2020 |  | 56,328 | ​ | $ | 24.98
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, 2021 | ​ | 131,398 |  | $ | 23.57
Granted | ​ | 59,401 | ​ | ​ | 25.51
Vested and exercised | ​ | (38,202) | ​ | ​ | 27.33
Forfeited | ​ | (18,980) | ​ | ​ | 22.72
Outstanding at December 31, 2021 | ​ | 133,617 | ​ | $ | 23.48
​ ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Average
​ | ​ | Restricted Stock | ​ | Grant Date Fair
​ |  | Units Outstanding |  | Value
Outstanding at January 1, 2020 | ​ | 106,552 |  | $ | 25.82
Granted | ​ | 63,667 | ​ | ​ | 21.98
Vested and exercised | ​ | (31,565) | ​ | ​ | 27.38
Forfeited | ​ | (7,256) | ​ | ​ | 25.60
Outstanding at December 31, 2020 | ​ | 131,398 | ​ | $ | 23.57

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