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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of funded status of the defined benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension |  | Postretirement
(In Thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
CHANGE IN BENEFIT OBLIGATION: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​
Benefit obligation at beginning of year | ​ | $ | 1,101 | ​ | $ | 976 | ​ | $ | 1,347 | ​ | $ | 1,326
Service cost | ​ |  | 0 | ​ |  | 0 | ​ |  | 63 | ​ |  | 46
Interest cost | ​ |  | 20 | ​ |  | 23 | ​ |  | 33 | ​ |  | 39
Plan participants' contributions | ​ |  | 0 | ​ |  | 0 | ​ |  | 148 | ​ |  | 185
Actuarial loss (gain) | ​ |  | 12 | ​ |  | 108 | ​ |  | (65) | ​ |  | 11
Benefits paid | ​ |  | (5) | ​ |  | (6) | ​ |  | (229) | ​ |  | (260)
Benefit obligation at end of year | ​ | $ | 1,128 | ​ | $ | 1,101 | ​ | $ | 1,297 | ​ | $ | 1,347
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
CHANGE IN PLAN ASSETS: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year | ​ | $ | 1,062 | ​ | $ | 971 | ​ | $ | 0 | ​ | $ | 0
Actual return on plan assets | ​ |  | 118 | ​ |  | 97 | ​ |  | 0 | ​ |  | 0
Employer contribution | ​ |  | 0 | ​ |  | 0 | ​ |  | 81 | ​ |  | 75
Plan participants' contributions | ​ |  | 0 | ​ |  | 0 | ​ |  | 148 | ​ |  | 185
Benefits paid | ​ |  | (5) | ​ |  | (6) | ​ |  | (229) | ​ |  | (260)
Fair value of plan assets at end of year | ​ | $ | 1,175 | ​ | $ | 1,062 | ​ | $ | 0 | ​ | $ | 0
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Funded status at end of year | ​ | $ | 47 | ​ | $ | (39) | ​ | $ | (1,297) | ​ | $ | (1,347)
Schedule of pension plan and postretirement plan liability amounts were recognized in the consolidated balance sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Postretirement
(In Thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Other assets | ​ | $ | 47 | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 0
Accrued interest and other liabilities | ​ | ​ | 0 | ​ | ​ | 39 | ​ | ​ | 1,297 | ​ | ​ | 1,347
Summary of items not yet recognized as a component of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension | ​ | Postretirement
(In Thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Prior service cost | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | (186) | ​ | $ | (217)
Net actuarial loss (gain) |  | ​ | 182 |  | ​ | 277 |  | ​ | (271) |  | ​ | (211)
Total | ​ | $ | 182 | ​ | $ | 277 | ​ | $ | (457) | ​ | $ | (428)
Summary of components of net periodic benefit costs from defined benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension | ​ | Postretirement
(In Thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 63 | ​ | $ | 46
Interest cost |  | ​ | 20 |  | ​ | 23 |  | ​ | 33 |  | ​ | 39
Expected return on plan assets |  | ​ | (30) |  | ​ | (27) |  | ​ | 0 |  | ​ | 0
Amortization of prior service cost |  | ​ | 0 |  | ​ | 0 |  | ​ | (31) |  | ​ | (31)
Recognized net actuarial loss (gain) |  | ​ | 19 |  | ​ | 16 |  | ​ | (5) |  | ​ | (14)
Total net periodic benefit cost | ​ | $ | 9 | ​ | $ | 12 | ​ | $ | 60 | ​ | $ | 40
Schedule of weighted-average assumptions used to determine net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension | ​ | Postretirement |
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Discount rate |  | 2.30 | % | 3.10 | % | 2.50 | % | 3.25 | %
Expected return on plan assets |  | 4.81 | % | 4.99 | % | N/A |  | N/A | ​
Rate of compensation increase |  | N/A |  | N/A |  | N/A |  | N/A | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension |  | Postretirement | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Discount rate |  | 2.60 | % | 2.30 | % | 3.00 | % | 2.50 | %
Rate of compensation increase |  | N/A |  | N/A |  | N/A |  | N/A | ​
Schedule of Estimated future benefit payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Pension |  | Postretirement
2022 | ​ | $ | 542 | ​ | $ | 84
2023 | ​ |  | 187 | ​ |  | 81
2024 | ​ |  | 8 | ​ |  | 83
2025 | ​ |  | 8 | ​ |  | 85
2026 | ​ |  | 14 | ​ |  | 95
2027-2031 | ​ |  | 360 | ​ |  | 428
Schedule of fair values of pension plan assets | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |
Mutual funds invested principally in: | ​ | ​ | ​ | ​ |
Cash and cash equivalents |  | 3 | % | 2 | %
Debt securities |  | 38 | % | 36 | %
Equity securities |  | 51 | % | 51 | %
Alternative funds |  | 8 | % | 11 | %
Total |  | 100 | % | 100 | %
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | 2021 |  | 2020
Restricted stock | ​ | $ | 1,214 | ​ | $ | 1,050
Stock options |  | ​ | 0 |  | ​ | 0
Total | ​ | $ | 1,214 | ​ | $ | 1,050
Summary of non-vested restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  |  |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | Number | ​ | Grant Date
​ |  | of Shares |  | Fair Value
Outstanding, December 31, 2020 |  | 101,942 | ​ | $ | 23.42
Granted |  | 78,391 | ​ | $ | 20.28
Vested |  | (48,016) | ​ | $ | 23.85
Forfeited |  | (5,290) | ​ | $ | 22.10
Outstanding, December 31, 2021 |  | 127,027 | ​ | $ | 21.37
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise
​ |  | Shares |  | Price |  | Shares |  | Price
Outstanding, beginning of year |  | 57,111 | ​ | $ | 18.92 |  | 75,897 | ​ | $ | 18.69
Granted |  | 0 | ​ |  | ​ |  | 0 | ​ |  | ​
Exercised |  | (22,429) | ​ | $ | 18.96 |  | (17,222) | ​ | $ | 18.25
Forfeited |  | (3,156) | ​ | $ | 19.20 |  | (1,564) | ​ | $ | 15.06
Expired |  | (7,308) | ​ | $ | 15.06 |  | 0 | ​ | $ | ​
Outstanding, end of year |  | 24,218 | ​ | $ | 20.01 |  | 57,111 | ​ | $ | 18.92
Options exercisable at year-end |  | 24,218 | ​ | $ | 20.01 |  | 57,111 | ​ | $ | 18.92
Weighted-average fair value of options forfeited |  | ​ | ​ | $ | 4.59 |  | ​ | ​ | $ | 4.26
Restricted Stock |
Notes Tables |
Summary of awarded shares of restricted stock under the Stock Incentive Plan, | ​
​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Time-based awards to independent directors | ​ | 10,989 | ​ | 7,580
Time-based awards to employees |  | 50,178 |  | 45,457
Performance-based awards to employees |  | 17,224 |  | 17,903
Total |  | 78,391 |  | 70,940

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