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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of funded status of the defined benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension |  | Postretirement
(In Thousands) |  | 2023 | ​ | 2022 |  | 2023 | ​ | 2022
CHANGE IN BENEFIT OBLIGATION: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Benefit obligation at beginning of year | ​ | $ | 946 | ​ | $ | 1,128 | ​ | $ | 935 | ​ | $ | 1,297
Service cost | ​ |  | 0 | ​ |  | 0 | ​ |  | 54 | ​ |  | 63
Interest cost | ​ |  | 31 | ​ |  | 22 | ​ |  | 48 | ​ |  | 34
Plan participants' contributions | ​ |  | 0 | ​ |  | 0 | ​ |  | 129 | ​ |  | 137
Actuarial loss (gain) | ​ |  | 63 | ​ |  | (199) | ​ |  | 37 | ​ |  | (394)
Benefits paid | ​ | ​ | (5) | ​ | ​ | (5) | ​ | ​ | (190) | ​ | ​ | (202)
Settlement of plan obligation | ​ |  | (139) | ​ |  | 0 | ​ |  | 0 | ​ |  | 0
Benefit obligation at end of year | ​ | $ | 896 | ​ | $ | 946 | ​ | $ | 1,013 | ​ | $ | 935
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
CHANGE IN PLAN ASSETS: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year | ​ | $ | 1,001 | ​ | $ | 1,175 | ​ | $ | 0 | ​ | $ | 0
Actual return on plan assets | ​ |  | 89 | ​ |  | (169) | ​ |  | 0 | ​ |  | 0
Employer contribution | ​ |  | 0 | ​ |  | 0 | ​ |  | 61 | ​ |  | 65
Plan participants' contributions | ​ |  | 0 | ​ |  | 0 | ​ |  | 129 | ​ |  | 137
Benefits paid | ​ | ​ | (5) | ​ | ​ | (5) | ​ | ​ | (190) | ​ | ​ | (202)
Settlement of plan obligation | ​ |  | (139) | ​ |  | 0 | ​ |  | 0 | ​ |  | 0
Fair value of plan assets at end of year | ​ | $ | 946 | ​ | $ | 1,001 | ​ | $ | 0 | ​ | $ | 0
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Funded status at end of year | ​ | $ | 50 | ​ | $ | 55 | ​ | $ | (1,013) | ​ | $ | (935)
Schedule of pension plan and postretirement plan liability amounts were recognized in the consolidated balance sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Postretirement
(In Thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Other assets | ​ | $ | 50 | ​ | $ | 55 | ​ | $ | 0 | ​ | $ | 0
Accrued interest and other liabilities | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 1,013 | ​ | ​ | 935
Summary of items not yet recognized as a component of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension | ​ | Postretirement
(In Thousands) |  | 2023 | ​ | 2022 |  | 2023 | ​ | 2022
Prior service cost | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | (124) | ​ | $ | (155)
Net actuarial loss (gain) |  | ​ | 139 | ​ | ​ | 179 |  | ​ | (573) | ​ | ​ | (646)
Total | ​ | $ | 139 | ​ | $ | 179 | ​ | $ | (697) | ​ | $ | (801)
Summary of components of net periodic benefit costs from defined benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension | ​ | Postretirement
(In Thousands) |  | 2023 | ​ | 2022 |  | 2021 |  | 2023 | ​ | 2022 |  | 2021
Service cost | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 54 | ​ | $ | 63 | ​ | $ | 63
Interest cost |  | ​ | 31 | ​ | ​ | 22 | ​ | ​ | 20 |  | ​ | 48 | ​ | ​ | 34 | ​ | ​ | 33
Expected return on plan assets |  | ​ | (18) | ​ | ​ | (35) | ​ | ​ | (30) |  | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Amortization of prior service cost |  | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0 |  | ​ | (31) | ​ | ​ | (31) | ​ | ​ | (31)
Recognized net actuarial loss (gain) |  | ​ | 11 | ​ | ​ | 8 | ​ | ​ | 19 |  | ​ | (36) | ​ | ​ | (19) | ​ | ​ | (5)
Settlement of plan obligation | ​ | ​ | 21 | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Total net periodic benefit cost | ​ | $ | 45 | ​ | $ | (5) | ​ | $ | 9 | ​ | $ | 35 | ​ | $ | 47 | ​ | $ | 60
Schedule of weighted-average assumptions used to determine net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension | ​ | Postretirement |
​ |  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021 |
Discount rate |  | 5.05 | % | 2.60 | % | 2.30 | % | 3.00 | % | 3.00 | % | 2.50 | %
Expected return on plan assets |  | 4.22 | % | 5.00 | % | 4.81 | % | N/A |  | N/A |  | N/A | ​
Rate of compensation increase |  | N/A |  | N/A |  | N/A |  | N/A |  | N/A |  | N/A | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension |  | Postretirement | ​
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022 | ​
Discount rate |  | 4.80 | % | 5.05 | % | 5.00 | % | 5.25 | %
Rate of compensation increase |  | N/A |  | N/A |  | N/A |  | N/A | ​
Schedule of Estimated future benefit payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Pension |  | Postretirement
2024 | ​ | $ | 570 | ​ | $ | 74
2025 | ​ |  | 8 | ​ |  | 85
2026 | ​ |  | 14 | ​ |  | 98
2027 | ​ |  | 8 | ​ |  | 88
2028 | ​ |  | 260 | ​ |  | 97
2029-2033 | ​ |  | 36 | ​ |  | 493
Schedule of fair values of pension plan assets | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |
Mutual funds invested principally in: | ​ | ​ | ​ | ​ |
Cash and cash equivalents |  | 54 | % | 3 | %
Debt securities |  | 18 | % | 39 | %
Equity securities |  | 24 | % | 50 | %
Alternative funds |  | 4 | % | 8 | %
Total |  | 100 | % | 100 | %
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | 2023 | ​ | 2022 |  | 2021
Restricted stock | ​ | $ | 1,472 | ​ | $ | 1,260 | ​ | $ | 1,214
Stock options |  | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Total | ​ | $ | 1,472 | ​ | $ | 1,260 | ​ | $ | 1,214
Summary of non-vested restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  |  |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | Number | ​ | Grant Date
​ |  | of Shares |  | Fair Value
Outstanding, December 31, 2022 |  | 135,220 | ​ | $ | 23.23
Granted |  | 53,788 | ​ | $ | 23.35
Vested |  | (53,738) | ​ | $ | 23.46
Forfeited |  | (25,261) | ​ | $ | 22.11
Outstanding, December 31, 2023 |  | 110,009 | ​ | $ | 23.44
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 | ​ | 2021
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise
​ |  | Shares |  | Price |  | Shares |  | Price | ​ | Shares |  | Price
Outstanding, beginning of year |  | 10,564 | ​ | $ | 20.45 |  | 24,218 | ​ | $ | 20.01 |  | 57,111 | ​ | $ | 18.92
Granted |  | 0 | ​ |  | ​ |  | 0 | ​ |  | ​ |  | 0 | ​ |  | ​
Exercised |  | (8,288) | ​ | $ | 20.45 |  | (13,654) | ​ | $ | 19.67 |  | (22,429) | ​ | $ | 18.96
Forfeited |  | (1,630) | ​ | $ | 20.45 |  | 0 | ​ | ​ | ​ |  | (3,156) | ​ | $ | 19.20
Expired |  | 0 | ​ | ​ | ​ |  | 0 | ​ | ​ | ​ |  | (7,308) | ​ | $ | 15.06
Outstanding, end of year |  | 646 | ​ | $ | 20.45 |  | 10,564 | ​ | $ | 20.45 |  | 24,218 | ​ | $ | 20.01
Options exercisable at year-end |  | 646 | ​ | $ | 20.45 |  | 10,564 | ​ | $ | 20.45 |  | 24,218 | ​ | $ | 20.01
Weighted-average fair value of options forfeited |  | ​ | ​ | $ | 5.50 |  | ​ | ​ | ​ | N/A |  | ​ | ​ | $ | 4.59
Restricted Stock |
Notes Tables |
Summary of awarded shares of restricted stock under the Stock Incentive Plan, | ​
​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Time-based awards to independent directors | ​ | 11,000 | ​ | 9,588
Time-based awards to employees |  | 31,684 |  | 51,638
Performance-based awards to employees |  | 11,104 |  | 17,017
Total |  | 53,788 |  | 78,243

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