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Postretirement Benefit Plans - Assumptions Used (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Postretirement Health And Life Coverage |  |  |
Weighted Average Assumptions Used in Calculating Benefit Obligation |  |  |
Discount rate | 4.67% | 4.90% |
Rate of compensation increase | 0.00% | 0.00% |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |
Discount rate | 4.90% | 2.40% | 2.25%
Rate of compensation increase | 0.00% | 0.00% | 2.00%
Director's Retirement Plan |  |  |
Weighted Average Assumptions Used in Calculating Benefit Obligation |  |  |
Discount rate | 4.80% | 4.90% |
Change in consumer price index | 3.40% | 7.00% |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |
Discount rate | 4.80% | 4.90% | 2.40%
Change in consumer price index | 3.40% | 7.00% | 1.40%
Scottdale Defined Benefit Pension Plan |  |  |
Weighted Average Assumptions Used in Calculating Benefit Obligation |  |  |
Discount rate | 5.00% | 5.25% |
Expected long-term return on plan assets | 4.50% | 4.50% |
Rate of compensation increase | 2.50% | 2.50% |
Riverview Defined Benefit Plan | Union |  |  |
Weighted Average Assumptions Used in Calculating Benefit Obligation |  |  |
Discount rate | 5.02% | 2.83% |
Expected long-term return on plan assets | 6.00% | 6.00% |
Riverview Defined Benefit Plan | Citizens |  |  |
Weighted Average Assumptions Used in Calculating Benefit Obligation |  |  |
Discount rate | 5.02% | 2.83% |
Expected long-term return on plan assets | 6.00% | 6.00% |
Riverview Defined Benefit Plan | Postretirement Life Insurance Benefits Citizens |  |  |
Weighted Average Assumptions Used in Calculating Benefit Obligation |  |  |
Discount rate | 4.70% | 3.00% |

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- Definition Percentage change in the Consumer Price Index, which is measure that examines the weighted average of prices of a basket of consumer goods and services + References No definition available. + Details
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- Definition Percentage change in the Consumer Price Index, which is measure that examines the weighted average of prices of a basket of consumer goods and services + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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