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Postretirement Benefit Plans - Weighted-Average Asset Allocation By Investment Category (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Riverview Defined Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 6,895,000 | $ 6,720,000 | $ 8,984,000
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 | $ 48,000 | $ 69,000 |
Percentage of Total Assets | 0.70% | 1.00% |
Riverview Defined Benefit Plan | Mutual fund - equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 2,499,000 | $ 2,411,000 |
Percentage of Total Assets | 36.20% | 35.90% |
Riverview Defined Benefit Plan | Common / collective trusts equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 310,000 | $ 334,000 |
Percentage of Total Assets | 4.50% | 5.00% |
Riverview Defined Benefit Plan | Mutual fund / EFTs - fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 4,038,000 | $ 3,906,000 |
Percentage of Total Assets | 58.60% | 58.10% |
Scottdale Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 3,468,000 | $ 4,722,000 | $ 5,302,000
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 | $ 90,000 | $ 108,000 |
Percentage of Total Assets | 2.60% | 2.30% |
Scottdale Defined Benefit Pension Plan | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 1,192,000 | $ 1,841,000 |
Percentage of Total Assets | 34.40% | 39.00% |
Scottdale Defined Benefit Pension Plan | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated Fair Value | $ 2,186,000 | $ 2,773,000 |
Percentage of Total Assets | 63.00% | 58.70% |

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