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Postretirement Benefit Plans - Weighted-Average Asset Allocation By Investment Category (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Riverview Defined Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 6,711,000 | $ 6,895,000 | $ 6,720,000
Percentage of Total Assets | 100.00% | 100.00% |
Riverview Defined Benefit Plan | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 60,000 | $ 48,000 |
Percentage of Total Assets | 0.90% | 0.70% |
Riverview Defined Benefit Plan | Mutual fund - equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 2,619,000 | $ 2,499,000 |
Percentage of Total Assets | 39.00% | 36.20% |
Riverview Defined Benefit Plan | Common / collective trusts equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 316,000 | $ 310,000 |
Percentage of Total Assets | 4.70% | 4.50% |
Riverview Defined Benefit Plan | Mutual fund / EFTs - fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 3,716,000 | $ 4,038,000 |
Percentage of Total Assets | 55.40% | 58.60% |
Scottdale Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 3,597,000 | $ 3,468,000 | $ 4,722,000
Percentage of Total Assets | 100.00% | 100.00% |
Scottdale Defined Benefit Pension Plan | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 263,000 | $ 90,000 |
Percentage of Total Assets | 7.30% | 2.60% |
Scottdale Defined Benefit Pension Plan | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 1,253,000 | $ 1,192,000 |
Percentage of Total Assets | 34.80% | 34.40% |
Scottdale Defined Benefit Pension Plan | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 2,081,000 | $ 2,186,000 |
Percentage of Total Assets | 57.90% | 63.00% |

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