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Pension and Other Postretirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Actuarial | ​ | Prior Service | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Loss (Gain) | ​ | Cost (Credit) | ​ | Total
​ |  | 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
​ | ​ | (In thousands)
Employee Retirement Plan | ​ | $ | 2,273 | ​ | $ | 3,238 | ​ | $ | 6,166 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 2,273 | ​ | $ | 3,238 | ​ | $ | 6,166
Other Postretirement Benefit Plans | ​ |  | (265) | ​ |  | 35 | ​ |  | 1,223 | ​ |  | (198) | ​ |  | (283) | ​ |  | (368) | ​ |  | (463) | ​ |  | (248) | ​ |  | 855
Outside Directors Plan | ​ |  | (380) | ​ |  | (566) | ​ |  | (472) | ​ |  | — | ​ |  | — | ​ |  | 12 | ​ |  | (380) | ​ |  | (566) | ​ |  | (460)
Total | ​ | $ | 1,628 | ​ | $ | 2,707 | ​ | $ | 6,917 | ​ | $ | (198) | ​ | $ | (283) | ​ | $ | (356) | ​ | $ | 1,430 | ​ | $ | 2,424 | ​ | $ | 6,561
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Net Actuarial |  | Prior Service |  | Expense
​ | ​ | Loss (Gain) | ​ | Cost (Credit) | ​ | (Benefit)
​ | ​ | (In thousands)
Employee Retirement Plan | ​ | $ | 444 | ​ | $ | — | ​ | $ | 444
Other Postretirement Benefit Plans | ​ |  | — | ​ |  | (85) | ​ |  | (85)
Outside Directors Plan | ​ |  | (55) | ​ |  | — | ​ |  | (55)
Total | ​ | $ | 389 | ​ | $ | (85) | ​ | $ | 304
Schedule of Net Funded Status [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
​ | ​ | (In thousands)
Change in benefit obligation: |  | ​ |  |  | ​ |
Projected benefit obligation at beginning of year | ​ | $ | 20,344 | ​ | $ | 23,605
Interest cost | ​ |  | 797 | ​ |  | 781
Actuarial loss (gain) | ​ |  | 2,265 | ​ |  | (2,389)
Benefits paid | ​ |  | (963) | ​ |  | (1,653)
Projected benefit obligation at end of year | ​ |  | 22,443 | ​ |  | 20,344
​ | ​ | ​ | ​ | ​ | ​ | ​
Change in plan assets: | ​ |  |  | ​ |  |
Market value of assets at beginning of year | ​ |  | 22,419 | ​ |  | 22,702
Actual return on plan assets | ​ |  | 4,049 | ​ |  | 1,370
Benefits paid | ​ |  | (963) | ​ |  | (1,653)
Market value of plan assets at end of year | ​ |  | 25,505 | ​ |  | 22,419
​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued pension asset included in other assets | ​ | $ | 3,062 | ​ | $ | 2,075
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
​ | ​ | (In thousands)
Change in benefit obligation: |  | ​ |  |  | ​ |
Projected benefit obligation at beginning of year | ​ | $ | 8,518 | ​ | $ | 9,104
Service cost | ​ |  | 280 | ​ |  | 350
Interest cost | ​ |  | 341 | ​ |  | 307
Actuarial gain | ​ |  | (301) | ​ |  | (1,155)
Benefits paid | ​ |  | (76) | ​ |  | (88)
Projected benefit obligation at end of year | ​ |  | 8,762 | ​ |  | 8,518
​ | ​ | ​ | ​ | ​ | ​ | ​
Change in plan assets: | ​ |  |  | ​ |  |
Market value of assets at beginning of year | ​ |  | — | ​ |  | —
Employer contributions | ​ |  | 76 | ​ |  | 88
Benefits paid | ​ |  | (76) | ​ |  | (88)
Market value of plan assets at end of year | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued pension cost included in other liabilities | ​ | $ | 8,762 | ​ | $ | 8,518
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
​ | ​ | (In thousands)
Change in benefit obligation: |  | ​ |  |  | ​ |
Projected benefit obligation at beginning of year | ​ | $ | 2,265 | ​ | $ | 2,425
Service cost | ​ |  | 39 | ​ |  | 42
Interest cost | ​ |  | 86 | ​ |  | 78
Actuarial (gain) loss | ​ |  | 44 | ​ |  | (184)
Benefits paid | ​ |  | (144) | ​ |  | (96)
Projected benefit obligation at end of year | ​ |  | 2,290 | ​ |  | 2,265
​ | ​ | ​ | ​ | ​ | ​ | ​
Change in plan assets: | ​ |  |  | ​ |  |
Market value of assets at beginning of year | ​ |  | — | ​ |  | —
Employer contributions | ​ |  | 144 | ​ |  | 96
Benefits paid | ​ |  | (144) | ​ |  | (96)
Market value of plan assets at end of year | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued pension cost included in other liabilities | ​ | $ | (2,290) | ​ | $ | (2,265)
Schedule of Assumptions Used [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |
Weighted average discount rate |  | 3.00 | % | 4.06 | %
Rate of increase in future compensation levels |  | n/a |  | n/a | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017 |
Weighted average discount rate |  | 4.06 | % | 3.42 | % | 3.88 | %
Rate of increase in future compensation levels |  | n/a |  | n/a |  | n/a | ​
Expected long-term rate of return on assets |  | 5.25 | % | 7.00 | % | 7.00 | %
​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |
Discount rate |  | 3.00 | % | 4.06 | %
Rate of increase in health care costs |  |  |  |  | ​
Initial |  | 7.50 | % | 7.00 | %
Ultimate (year 2023) |  | 5.00 | % | 5.00 | %
Annual rate of salary increase for life insurance |  | n/a |  | n/a | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017 |
Rate of return on plan assets |  | n/a |  | n/a |  | n/a | ​
Discount rate |  | 4.06 | % | 3.42 | % | 3.88 | %
Rate of increase in health care costs |  |  |  |  |  |  | ​
Initial |  | 7.00 | % | 7.00 | % | 8.00 | %
Ultimate (year 2023) |  | 5.00 | % | 5.00 | % | 5.00 | %
Annual rate of salary increase for life insurance |  | n/a |  | n/a |  | n/a | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017 |
Weighted average discount rate for the benefit obligation |  | 3.00 | % | 4.06 | % | 3.42 | %
Weighted average discount rate for periodic pension benefit expense |  | 4.06 | % | 3.42 | % | 3.88 | %
Rate of increase in future compensation levels |  | n/a |  | n/a |  | n/a | ​
Schedule of Net Benefit Costs [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
​ | ​ | (In thousands)
Interest cost | ​ | $ | 797 | ​ | $ | 781 | ​ | $ | 864
Amortization of unrecognized loss | ​ |  | 269 | ​ |  | 621 | ​ |  | 697
Expected return on plan assets | ​ |  | (1,088) | ​ |  | (1,452) | ​ |  | (1,392)
Net pension (benefit) expense | ​ |  | (22) | ​ |  | (50) | ​ |  | 169
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current year actuarial gain | ​ |  | (696) | ​ |  | (2,307) | ​ |  | (1,192)
Amortization of actuarial loss | ​ |  | (269) | ​ |  | (621) | ​ |  | (697)
Total recognized in other comprehensive income | ​ |  | (965) | ​ |  | (2,928) | ​ |  | (1,889)
Total recognized in net pension cost (benefit) and other comprehensive loss | ​ | $ | (987) | ​ | $ | (2,978) | ​ | $ | (1,720)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
​ | ​ | (In thousands)
Service cost | ​ | $ | 280 | ​ | $ | 350 | ​ | $ | 316
Interest cost | ​ |  | 341 | ​ |  | 307 | ​ |  | 305
Amortization of unrecognized loss | ​ |  | — | ​ |  | 33 | ​ |  | —
Amortization of past service credit | ​ |  | (85) | ​ |  | (85) | ​ |  | (85)
Net postretirement benefit expense | ​ |  | 536 | ​ |  | 605 | ​ |  | 536
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current year actuarial (gain) loss | ​ |  | (301) | ​ |  | (1,155) | ​ |  | 587
Amortization of actuarial loss | ​ |  | — | ​ |  | (33) | ​ |  | —
Amortization of prior service credit | ​ |  | 85 | ​ |  | 85 | ​ |  | 85
Total recognized in other comprehensive income | ​ |  | (216) | ​ |  | (1,103) | ​ |  | 672
Total recognized in net postretirement expense and other comprehensive loss | ​ | $ | 320 | ​ | $ | (498) | ​ | $ | 1,208
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
​ | ​ | (In thousands)
Service cost | ​ | $ | 39 | ​ | $ | 42 | ​ | $ | 42
Interest cost | ​ |  | 86 | ​ |  | 78 | ​ |  | 89
Amortization of unrecognized gain | ​ |  | (141) | ​ |  | (91) | ​ |  | (92)
Amortization of past service liability | ​ |  | — | ​ |  | 12 | ​ |  | 40
Net pension expense | ​ |  | (16) | ​ |  | 41 | ​ |  | 79
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current actuarial (gain) loss | ​ |  | 44 | ​ |  | (184) | ​ |  | (24)
Amortization of actuarial gain | ​ |  | 141 | ​ |  | 91 | ​ |  | 92
Amortization of prior service cost | ​ |  | — | ​ |  | (12) | ​ |  | (40)
Total recognized in other comprehensive income | ​ |  | 185 | ​ |  | (105) | ​ |  | 28
Total recognized in net pension expense and other comprehensive income | ​ | $ | 169 | ​ | $ | (64) | ​ | $ | 107
Schedule of Expected Benefit Payments [Table Text Block] | ​
​ | ​ | ​ | ​
​ |  | Future Benefit
​ | ​ | Payments
​ | ​ | (In thousands)
2020 | ​ | $ | 1,317
2021 | ​ |  | 1,177
2022 | ​ |  | 1,206
2023 | ​ |  | 1,224
2024 | ​ |  | 1,216
2025-2029 | ​ |  | 5,951
​
​ | ​ | ​ | ​
​ |  | Future Benefit
​ | ​ | Payments
​ | ​ | (In thousands)
2020 | ​ | $ | 252
2021 | ​ |  | 274
2022 | ​ |  | 307
2023 | ​ |  | 323
2024 | ​ |  | 315
2025-2029 | ​ |  | 1,794
​
​ | ​ | ​ | ​
​ |  | Future Benefit
​ | ​ | Payments
​ | ​ | (In thousands)
2020 | ​ | $ | 288
2021 | ​ |  | 288
2022 | ​ |  | 288
2023 | ​ |  | 256
2024 | ​ |  | 220
2025 - 2029 | ​ |  | 916
Schedule of Allocation of Plan Assets [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |
Equity securities |  | — | % | — | %
Debt securities |  | 100 | % | 100 | %
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31,
​ |  | 2019 |  | 2018
​ | ​ | (In thousands)
Pooled Separate Accounts |  | ​ |  |  | ​ |
Long duration bond fund (a) | ​ | $ | 11,242 | ​ | $ | 10,045
Long corporate bond fund (b) | ​ |  | 5,069 | ​ |  | 4,471
Prudential short term (c) | ​ |  | 403 | ​ |  | 360
Mutual Fund | ​ |  |  | ​ |  |
Investment grade bond fund (d) | ​ |  | 8,791 | ​ |  | 7,543
​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 25,505 | ​ | $ | 22,419
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Increase |  | Decrease
​ | ​ | (In thousands)
Effect on postretirement benefit obligation | ​ | $ | 1,635 | ​ | $ | (1,272)
Effect on total service and interest cost | ​ |  | 123 | ​ |  | (94)
Schedule of Employee Benefit Trust Shares [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Shares owned by Employee Benefit Trust, beginning balance |  | ​ | 329,090 |  | ​ | 445,022
Shares purchased |  | ​ | 7,267 |  | ​ | 13,669
Shares released and allocated |  | ​ | (154,746) |  | ​ | (129,601)
Shares owned by Employee Benefit Trust, ending balance |  | ​ | 181,611 |  | ​ | 329,090
​ | ​ | ​ | ​ | ​ | ​ | ​
Market value of unallocated shares | ​ | $ | 3,924,614 | ​ | $ | 7,085,308

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