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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of funded status of the defined benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension |  | Postretirement
(In Thousands) |  | 2022 | ​ | 2021 |  | 2022 | ​ | 2021
CHANGE IN BENEFIT OBLIGATION: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Benefit obligation at beginning of year | ​ | $ | 1,128 | ​ | $ | 1,101 | ​ | $ | 1,297 | ​ | $ | 1,347
Service cost | ​ |  | 0 | ​ |  | 0 | ​ |  | 63 | ​ |  | 63
Interest cost | ​ |  | 22 | ​ |  | 20 | ​ |  | 34 | ​ |  | 33
Plan participants' contributions | ​ |  | 0 | ​ |  | 0 | ​ |  | 137 | ​ |  | 148
Actuarial (gain) loss | ​ |  | (199) | ​ |  | 12 | ​ |  | (394) | ​ |  | (65)
Benefits paid | ​ |  | (5) | ​ |  | (5) | ​ |  | (202) | ​ |  | (229)
Benefit obligation at end of year | ​ | $ | 946 | ​ | $ | 1,128 | ​ | $ | 935 | ​ | $ | 1,297
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
CHANGE IN PLAN ASSETS: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year | ​ | $ | 1,175 | ​ | $ | 1,062 | ​ | $ | 0 | ​ | $ | 0
Actual return on plan assets | ​ |  | (169) | ​ |  | 118 | ​ |  | 0 | ​ |  | 0
Employer contribution | ​ |  | 0 | ​ |  | 0 | ​ |  | 65 | ​ |  | 81
Plan participants' contributions | ​ |  | 0 | ​ |  | 0 | ​ |  | 137 | ​ |  | 148
Benefits paid | ​ |  | (5) | ​ |  | (5) | ​ |  | (202) | ​ |  | (229)
Fair value of plan assets at end of year | ​ | $ | 1,001 | ​ | $ | 1,175 | ​ | $ | 0 | ​ | $ | 0
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Funded status at end of year | ​ | $ | 55 | ​ | $ | 47 | ​ | $ | (935) | ​ | $ | (1,297)
Schedule of pension plan and postretirement plan liability amounts were recognized in the consolidated balance sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Postretirement
(In Thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Other assets | ​ | $ | 55 | ​ | $ | 47 | ​ | $ | 0 | ​ | $ | 0
Accrued interest and other liabilities | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 935 | ​ | ​ | 1,297
​
Summary of items not yet recognized as a component of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension | ​ | Postretirement
(In Thousands) |  | 2022 | ​ | 2021 |  | 2022 | ​ | 2021
Prior service cost | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | (155) | ​ | $ | (186)
Net actuarial loss (gain) |  | ​ | 179 | ​ | ​ | 182 |  | ​ | (646) | ​ | ​ | (271)
Total | ​ | $ | 179 | ​ | $ | 182 | ​ | $ | (801) | ​ | $ | (457)
Summary of components of net periodic benefit costs from defined benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension | ​ | Postretirement
(In Thousands) |  | 2022 | ​ | 2021 |  | 2020 |  | 2022 | ​ | 2021 |  | 2020
Service cost | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 63 | ​ | $ | 63 | ​ | $ | 46
Interest cost |  | ​ | 22 | ​ | ​ | 20 |  | ​ | 23 |  | ​ | 34 | ​ | ​ | 33 |  | ​ | 39
Expected return on plan assets |  | ​ | (35) | ​ | ​ | (30) |  | ​ | (27) |  | ​ | 0 | ​ | ​ | 0 |  | ​ | 0
Amortization of prior service cost |  | ​ | 0 | ​ | ​ | 0 |  | ​ | 0 |  | ​ | (31) | ​ | ​ | (31) |  | ​ | (31)
Recognized net actuarial loss (gain) |  | ​ | 8 | ​ | ​ | 19 |  | ​ | 16 |  | ​ | (19) | ​ | ​ | (5) |  | ​ | (14)
Total net periodic benefit cost | ​ | $ | (5) | ​ | $ | 9 | ​ | $ | 12 | ​ | $ | 47 | ​ | $ | 60 | ​ | $ | 40
​
Schedule of weighted-average assumptions used to determine net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension | ​ | Postretirement |
​ |  | 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020 |
Discount rate |  | 2.60 | % | 2.30 | % | 3.10 | % | 3.00 | % | 2.50 | % | 3.25 | %
Expected return on plan assets |  | 5.00 | % | 4.81 | % | 4.99 | % | N/A |  | N/A | ​ | N/A | ​
Rate of compensation increase |  | N/A |  | N/A |  | N/A |  | N/A |  | N/A | ​ | N/A | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension |  | Postretirement | ​
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021 | ​
Discount rate |  | 5.05 | % | 2.60 | % | 5.25 | % | 3.00 | %
Rate of compensation increase |  | N/A |  | N/A |  | N/A |  | N/A | ​
​
Schedule of Estimated future benefit payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Pension |  | Postretirement
2023 | ​ | $ | 646 | ​ | $ | 64
2024 | ​ |  | 8 | ​ |  | 74
2025 | ​ |  | 8 | ​ |  | 81
2026 | ​ |  | 13 | ​ |  | 92
2027 | ​ |  | 8 | ​ |  | 87
2028-2032 | ​ |  | 291 | ​ |  | 398
​
Schedule of fair values of pension plan assets | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |
Mutual funds invested principally in: | ​ | ​ | ​ | ​ |
Cash and cash equivalents |  | 3 | % | 3 | %
Debt securities |  | 39 | % | 38 | %
Equity securities |  | 50 | % | 51 | %
Alternative funds |  | 8 | % | 8 | %
Total |  | 100 | % | 100 | %
​
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | 2022 | ​ | 2021 |  | 2020
Restricted stock | ​ | $ | 1,260 | ​ | $ | 1,214 | ​ | $ | 1,050
Stock options |  | ​ | 0 | ​ | ​ | 0 |  | ​ | 0
Total | ​ | $ | 1,260 | ​ | $ | 1,214 | ​ | $ | 1,050
​
Summary of non-vested restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  |  |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | Number | ​ | Grant Date
​ |  | of Shares |  | Fair Value
Outstanding, December 31, 2021 |  | 127,027 | ​ | $ | 21.37
Granted |  | 78,243 | ​ | $ | 25.03
Vested |  | (59,268) | ​ | $ | 21.54
Forfeited |  | (10,782) | ​ | $ | 23.71
Outstanding, December 31, 2022 |  | 135,220 | ​ | $ | 23.23
​
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 | ​ | 2020
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise
​ |  | Shares |  | Price |  | Shares |  | Price | ​ | Shares |  | Price
Outstanding, beginning of year |  | 24,218 | ​ | $ | 20.01 |  | 57,111 | ​ | $ | 18.92 | ​ | 75,897 | ​ | $ | 18.69
Granted |  | 0 | ​ |  | ​ |  | 0 | ​ |  | ​ | ​ | 0 | ​ |  | ​
Exercised |  | (13,654) | ​ | $ | 19.67 |  | (22,429) | ​ | $ | 18.96 | ​ | (17,222) | ​ | $ | 18.25
Forfeited |  | 0 | ​ | ​ | ​ |  | (3,156) | ​ | $ | 19.20 | ​ | (1,564) | ​ | $ | 15.06
Expired |  | 0 | ​ | ​ | ​ |  | (7,308) | ​ | $ | 15.06 | ​ | 0 | ​ | $ | ​
Outstanding, end of year |  | 10,564 | ​ | $ | 20.45 |  | 24,218 | ​ | $ | 20.01 | ​ | 57,111 | ​ | $ | 18.92
Options exercisable at year-end |  | 10,564 | ​ | $ | 20.45 |  | 24,218 | ​ | $ | 20.01 | ​ | 57,111 | ​ | $ | 18.92
Weighted-average fair value of options forfeited |  | ​ | ​ | ​ | N/A |  | ​ | ​ | $ | 4.59 | ​ | ​ | ​ | $ | 4.26
​
Restricted Stock |
Notes Tables |
Summary of awarded shares of restricted stock under the Stock Incentive Plan, | ​
​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Time-based awards to independent directors | ​ | 9,588 | ​ | 10,989
Time-based awards to employees |  | 51,638 |  | 50,178
Performance-based awards to employees |  | 17,017 |  | 17,224
Total |  | 78,243 |  | 78,391
​

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