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STOCK BASED COMPENSATION PLANS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Allocation of Recognized Compensation Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2020 |  | 2019 |  | 2018
Stock options and restricted stock awards | ​ | $ | 287 | ​ | $ | 328 | ​ | $ | 350
Performance stock units | ​ |  | 385 | ​ |  | 170 | ​ |  | 237
Restricted stock units | ​ |  | 1,258 | ​ |  | 854 | ​ |  | 711
Total compensation expense | ​ | $ | 1,930 | ​ | $ | 1,352 | ​ | $ | 1,298
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, 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted | ​ | Aggregate
​ | ​ | Stock Options | ​ | Average | ​ | Intrinsic Value
Stock Options |  | Outstanding |  | Exercise Price |  | (in thousands)
Outstanding at January 1, 2019 |  | 121,637 | ​ | $ | 19.96 |  | ​ |
Granted |  | — | ​ |  | — |  | ​ |
Exercised |  | (13,853) | ​ |  | 18.44 |  | ​ |
Forfeited |  | — | ​ |  | — |  | ​ |
Outstanding at December 31, 2019 |  | 107,784 | ​ | $ | 20.15 | ​ | $ | 565
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending vested and expected to vest December 31, 2019 |  | 107,784 | ​ | $ | 20.15 | ​ | $ | 565
Exercisable at December 31, 2019 |  | 98,460 | ​ |  | 20.48 | ​ |  | 483
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, 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, 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
​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Average
​ | ​ | Performance Stock | ​ | Grant Date Fair
Performance Stock Units |  | Units Outstanding |  | Value
Nonvested at January 1, 2019 |  | 37,865 | ​ | $ | 26.77
Awarded |  | 17,968 | ​ |  | 23.24
Vested and exercised |  | (11,801) | ​ |  | 23.92
Forfeited |  | (974) | ​ |  | 28.78
Nonvested at December 31, 2019 |  | 43,058 | ​ | $ | 26.01
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, 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
​ ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Average
​ | ​ | Restricted Stock | ​ | Grant Date Fair
​ |  | Units Outstanding |  | Value
Outstanding at January 1, 2019 | ​ | 80,740 |  | $ | 28.24
Granted | ​ | 50,352 | ​ | ​ | 22.45
Vested and exercised | ​ | (19,411) | ​ | ​ | 26.11
Forfeited | ​ | (5,129) | ​ | ​ | 29.28
Outstanding at December 31, 2019 | ​ | 106,552 | ​ | $ | 25.82

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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