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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%