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Postretirement Benefit Plans - Net Funded Status (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Postretirement Health And Life Coverage |  |  |
Change in benefit obligations: |  |  |
Benefit obligations, beginning of period | $ 297,000 | $ 399,000 |
Service cost | 1,000 | 2,000 | $ 2,000
Interest cost | 13,000 | 8,000 | 9,000
Change in experience | (22,000) | (30,000) |
Change in assumptions | 0 | (67,000) |
Benefit payments | (18,000) | (15,000) |
Benefit obligations, end of period | 271,000 | 297,000 | 399,000
Change in fair value of plan assets: |  |  |
Fair value of plan assets, beginning of period | 0 | 0 |
Employer contributions | 18,000 | 15,000 |
Benefit payments | (18,000) | (15,000) |
Fair value of plan assets, end of period |  | 0 | 0
Funded status at year end | (271,000) | (297,000) |
Director's Retirement Plan |  |  |
Change in benefit obligations: |  |  |
Benefit obligations, beginning of period | 1,299,000 | 1,195,000 |
Service cost | 56,000 | 75,000 | 47,000
Interest cost | 61,000 | 30,000 | 26,000
Actuarial loss | 0 | 103,000 |
Change in assumptions | (12,000) | (23,000) |
Benefit payments | (98,000) | (81,000) |
Benefit obligations, end of period | 1,306,000 | 1,299,000 | 1,195,000
Change in fair value of plan assets: |  |  |
Fair value of plan assets, beginning of period | 0 | 0 |
Employer contributions | 98,000 | 81,000 |
Benefit payments | (98,000) | (81,000) |
Fair value of plan assets, end of period | 0 | 0 | 0
Funded status at year end | (1,306,000) | (1,299,000) |
Scottdale Defined Benefit Pension Plan |  |  |
Change in benefit obligations: |  |  |
Benefit obligations, beginning of period | 3,805,000 | 4,844,000 |
Service cost | 58,000 | 69,000 |
Interest cost | 197,000 | 144,000 |
Settlement (gain) loss | (4,000) | 0 |
Actuarial loss | 168,000 | (1,096,000) |
Settlement payments | (1,472,000) | 0 |
Benefit payments | (93,000) | (156,000) |
Benefit obligations, end of period | 2,659,000 | 3,805,000 | 4,844,000
Change in fair value of plan assets: |  |  |
Fair value of plan assets, beginning of period | 4,722,000 | 5,302,000 |
Return on plan assets | 348,000 | (385,000) |
Employer contributions | 0 | 0 |
Benefit payments | (93,000) | (156,000) |
Administrative expenses | (37,000) | (39,000) |
Settlement payments | (1,472,000) | 0 |
Fair value of plan assets, end of period | 3,468,000 | 4,722,000 | 5,302,000
Funded status at year end | 809,000 | 917,000 |
Riverview Defined Benefit Plan |  |  |
Change in benefit obligations: |  |  |
Benefit obligations, beginning of period | 6,424,000 | 8,165,000 |
Interest cost | 309,000 | 223,000 |
Actuarial loss | 228,000 | (1,407,000) |
Benefit payments | (519,000) | (557,000) |
Benefit obligations, end of period | 6,442,000 | 6,424,000 | 8,165,000
Change in fair value of plan assets: |  |  |
Fair value of plan assets, beginning of period | 6,720,000 | 8,984,000 |
Return on plan assets | 691,000 | (1,709,000) |
Employer contributions | 3,000 | 2,000 |
Benefit payments | (519,000) | (557,000) |
Fair value of plan assets, end of period | 6,895,000 | 6,720,000 | $ 8,984,000
Funded status at year end | $ 453,000 | $ 296,000 |

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