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Pension and Other Postretirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Actuarial | ​ | Prior Service | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (Gain) Loss | ​ | Cost (Credit) | ​ | Total
​ |  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021
​ | ​ | (In thousands)
Employee Retirement Plan | ​ | $ | 3,978 | ​ | $ | 3,944 | ​ | $ | 1,414 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 3,978 | ​ | $ | 3,944 | ​ | $ | 1,414
Other Postretirement Benefit Plans | ​ |  | (2,268) | ​ |  | (2,512) | ​ |  | 932 | ​ |  | — | ​ |  | — | ​ |  | (27) | ​ |  | (2,268) | ​ |  | (2,512) | ​ |  | 905
Outside Directors Plan | ​ |  | (1,158) | ​ |  | (1,034) | ​ |  | (440) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (1,158) | ​ |  | (1,034) | ​ |  | (440)
Total | ​ | $ | 552 | ​ | $ | 398 | ​ | $ | 1,906 | ​ | $ | — | ​ | $ | — | ​ | $ | (27) | ​ | $ | 552 | ​ | $ | 398 | ​ | $ | 1,879
Schedule of Net Funded Status | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
​ | ​ | (In thousands)
Change in benefit obligation: |  | ​ |  |  | ​ |
Projected benefit obligation at beginning of year | ​ | $ | 17,172 | ​ | $ | 22,109
Interest cost | ​ |  | 812 | ​ |  | 553
Actuarial (gain) loss | ​ |  | 199 | ​ |  | (4,243)
Benefits paid | ​ |  | (1,151) | ​ |  | (1,247)
Projected benefit obligation at end of year | ​ |  | 17,032 | ​ |  | 17,172
​ | ​ | ​ | ​ | ​ | ​ | ​
Change in plan assets: | ​ |  |  | ​ |  |
Market value of assets at beginning of year | ​ |  | 19,065 | ​ |  | 26,059
Actual return on plan assets | ​ |  | 1,306 | ​ |  | (5,747)
Benefits paid | ​ |  | (1,151) | ​ |  | (1,247)
Market value of plan assets at end of year | ​ |  | 19,220 | ​ |  | 19,065
​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued pension asset included in other assets | ​ | $ | 2,188 | ​ | $ | 1,893
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
​ | ​ | (In thousands)
Change in benefit obligation: |  | ​ |  |  | ​ |
Projected benefit obligation at beginning of year | ​ | $ | 7,851 | ​ | $ | 10,853
Service cost | ​ |  | 158 | ​ |  | 269
Interest cost | ​ |  | 381 | ​ |  | 277
Actuarial (gain) loss | ​ |  | 6 | ​ |  | (3,444)
Benefits paid | ​ |  | (124) | ​ |  | (104)
Projected benefit obligation at end of year | ​ |  | 8,272 | ​ |  | 7,851
​ | ​ | ​ | ​ | ​ | ​ | ​
Change in plan assets: | ​ |  |  | ​ |  |
Market value of assets at beginning of year | ​ |  | — | ​ |  | —
Employer contributions | ​ |  | 124 | ​ |  | 104
Benefits paid | ​ |  | (124) | ​ |  | (104)
Market value of plan assets at end of year | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued pension cost included in other liabilities | ​ | $ | 8,272 | ​ | $ | 7,851
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
​ | ​ | (In thousands)
Change in benefit obligation: |  | ​ |  |  | ​ |
Projected benefit obligation at beginning of year | ​ | $ | 1,302 | ​ | $ | 2,010
Service cost | ​ |  | 8 | ​ |  | 11
Interest cost | ​ |  | 59 | ​ |  | 48
Actuarial (gain) loss | ​ |  | (285) | ​ |  | (623)
Benefits paid | ​ |  | (68) | ​ |  | (144)
Projected benefit obligation at end of year | ​ |  | 1,016 | ​ |  | 1,302
​ | ​ | ​ | ​ | ​ | ​ | ​
Change in plan assets: | ​ |  |  | ​ |  |
Market value of assets at beginning of year | ​ |  | — | ​ |  | —
Employer contributions | ​ |  | 68 | ​ |  | 144
Benefits paid | ​ |  | (68) | ​ |  | (144)
Market value of plan assets at end of year | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued pension cost included in other liabilities | ​ | $ | 1,016 | ​ | $ | 1,302
Schedule of Assumptions Used | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |
Weighted average discount rate |  | 4.73 | % | 4.93 | %
Rate of increase in future compensation levels |  | n/a |  | n/a | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021 |
Weighted average discount rate |  | 4.93 | % | 2.58 | % | 2.18 | %
Rate of increase in future compensation levels |  | n/a |  | n/a |  | n/a | ​
Expected long-term rate of return on assets |  | 4.75 | % | 4.25 | % | 4.75 | %
​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |
Discount rate |  | 4.73 | % | 4.93 | %
Rate of increase in health care costs |  |  |  |  |
Initial |  | 7.50 | % | 7.50 | %
Ultimate (year 2090) |  | 4.54 | % | 4.44 | %
Annual rate of salary increase for life insurance |  | n/a |  | n/a | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021 |
Rate of return on plan assets |  | n/a |  | n/a |  | n/a | ​
Discount rate |  | 4.93 | % | 2.58 | % | 2.18 | %
Rate of increase in health care costs |  |  |  |  |  |  | ​
Initial |  | 7.50 | % | 7.50 | % | 7.50 | %
Ultimate (year 2090) |  | 4.44 | % | 5.00 | % | 5.00 | %
Annual rate of salary increase for life insurance |  | n/a |  | n/a |  | n/a | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021 |
Weighted average discount rate for the benefit obligation |  | 4.73 | % | 4.93 | % | 2.58 | %
Weighted average discount rate for periodic pension benefit expense |  | 4.93 | % | 2.58 | % | 2.18 | %
Rate of increase in future compensation levels |  | n/a |  | n/a |  | n/a | ​
Schedule of net expense for the pension and other postretirement benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
​ | ​ | (in thousands)
Interest cost | ​ | $ | 812 | ​ | $ | 553 | ​ | $ | 512
Amortization of unrecognized (gain) loss | ​ |  | — | ​ |  | 5 | ​ |  | 488
Expected return on plan assets | ​ |  | (1,109) | ​ |  | (1,031) | ​ |  | (1,096)
Net pension (benefit) expense | ​ |  | (297) | ​ |  | (473) | ​ |  | (96)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current year actuarial (gain) loss | ​ |  | 34 | ​ |  | 2,535 | ​ |  | 127
Amortization of actuarial (gains) losses | ​ |  | — | ​ |  | (5) | ​ |  | (488)
Total recognized in other comprehensive (income) loss | ​ |  | 34 | ​ |  | 2,530 | ​ |  | (361)
Total recognized in net pension (benefit) expense and other comprehensive (income) loss | ​ | $ | (263) | ​ | $ | 2,057 | ​ | $ | (457)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
​ | ​ | (In thousands)
Service cost | ​ | $ | 158 | ​ | $ | 269 | ​ | $ | 293
Interest cost | ​ |  | 381 | ​ |  | 277 | ​ |  | 233
Amortization of unrecognized (gain) loss | ​ |  | (238) | ​ |  | — | ​ |  | 30
Amortization of past service credit | ​ |  | — | ​ |  | (27) | ​ |  | (85)
Net postretirement benefit expense | ​ |  | 301 | ​ |  | 519 | ​ |  | 471
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current year actuarial gain (loss) | ​ |  | 6 | ​ |  | (3,444) | ​ |  | (370)
Amortization of actuarial (gain) loss | ​ |  | 238 | ​ |  | — | ​ |  | (31)
Amortization of prior service credit | ​ |  | — | ​ |  | 27 | ​ |  | 85
Total recognized in other comprehensive income (loss) | ​ |  | 244 | ​ |  | (3,417) | ​ |  | (316)
Total recognized in net postretirement (benefit) expense and other comprehensive income (loss) | ​ | $ | 545 | ​ | $ | (2,898) | ​ | $ | 155
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
​ | ​ | (In thousands)
Service cost | ​ | $ | 8 | ​ | $ | 11 | ​ | $ | 16
Interest cost | ​ |  | 59 | ​ |  | 48 | ​ |  | 46
Amortization of unrecognized (gain) loss | ​ |  | (161) | ​ |  | (29) | ​ |  | (18)
Net pension expense (income) | ​ |  | (94) | ​ |  | 30 | ​ |  | 44
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current actuarial (gain) loss | ​ |  | (285) | ​ |  | (623) | ​ |  | (184)
Amortization of actuarial gain (loss) | ​ |  | 161 | ​ |  | 29 | ​ |  | 18
Total recognized in other comprehensive income (loss) | ​ |  | (124) | ​ |  | (594) | ​ |  | (166)
Total recognized in net pension (benefit) expense and other comprehensive income (loss) | ​ | $ | (218) | ​ | $ | (564) | ​ | $ | (122)
Schedule of Expected Benefit Payments | ​
​ | ​ | ​
​ | Future Benefit
​ | Payments
​ | (In thousands)
2024 | $ | 1,247
2025 |  | 1,238
2026 |  | 1,237
2027 |  | 1,239
2028 |  | 1,232
2029-2033 |  | 6,052
​
​ | ​ | ​ | ​
​ |  | Future Benefit
​ | ​ | Payments
​ | ​ | (In thousands)
2024 | ​ | $ | 255
2025 | ​ |  | 297
2026 | ​ |  | 347
2027 | ​ |  | 399
2028 | ​ |  | 414
2029-2033 | ​ |  | 2,751
​
​ | ​ | ​ | ​
​ |  | Future Benefit
​ | ​ | Payments
​ | ​ | (In thousands)
2024 | ​ | $ | 124
2025 | ​ |  | 96
2026 | ​ |  | 96
2027 | ​ |  | 96
2028 | ​ |  | 96
2029 - 2033 | ​ |  | 444
​
Schedule of Allocation of Plan Assets | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |
Debt securities |  | 100 | % | 100 | %
Schedule of Changes in Fair Value of Plan Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31,
​ |  | 2023 |  | 2022
​ | ​ | (In thousands)
Pooled Separate Accounts |  | ​ |  |  | ​ |
Long duration bond fund (a) | ​ | $ | 4,842 | ​ | $ | 4,596
Long corporate bond fund (b) | ​ |  | 3,907 | ​ |  | 3,754
Prudential short term (c) | ​ |  | 363 | ​ |  | 262
Mutual Fund | ​ |  | ​ | ​ |  | ​
Investment grade bond fund (d) | ​ |  | 10,108 | ​ |  | 10,453
​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 19,220 | ​ | $ | 19,065
a. | Comprised of fixed income securities with durations of longer than six years that seek to maximize total return consistent with the preservation of capital and prudent investment management.
b. | Comprised of corporate bonds with an average duration within 0.25 years of the benchmark and its average credit quality is no lower than BBB. The fund seeks to outperform the Bloomberg Barclays Long Corporate Bond Index.
c. | Comprised of money market instruments with an emphasis on safety and liquidity.
d. | Comprised of high quality corporate bonds diversified broadly across industries, issuers and regions. The funds primary benchmark is the Bloomberg Barclays U.S. Credit Index.

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (d)(5) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (b) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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