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Postretirement Benefit Plans - Schedule of Weighted-Average Asset Allocation By Investment Category (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Scottdale Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 3,403 | $ 3,597 | $ 3,468
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 | $ 365 | $ 263 |
Percentage of Total Assets | 10.70% | 7.30% |
Scottdale Defined Benefit Pension Plan | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 1,894 | $ 2,081 |
Percentage of Total Assets | 55.70% | 57.90% |
Scottdale Defined Benefit Pension Plan | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 1,144 | $ 1,253 |
Percentage of Total Assets | 33.60% | 34.80% |
Riverview Defined Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 6,903 | $ 6,711 | $ 6,895
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 | $ 60 |
Percentage of Total Assets | 0.90% | 0.90% |
Riverview Defined Benefit Plan | Mutual fund - equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 2,618 | $ 2,619 |
Percentage of Total Assets | 37.90% | 39.00% |
Riverview Defined Benefit Plan | Mutual fund / EFTs - fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 3,926 | $ 3,716 |
Percentage of Total Assets | 56.90% | 55.40% |
Riverview Defined Benefit Plan | Common / collective trusts equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 299 | $ 316 |
Percentage of Total Assets | 4.30% | 4.70% |

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