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Postretirement Benefit Plans - Net Funded Status (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Postretirement Health And Life Coverage      
Change in benefit obligations:      
Benefit obligations, beginning of period $ 271,000 $ 297,000  
Service cost 1,000 1,000 $ 2,000
Interest cost 11,000 13,000 8,000
Change in experience (28,000) (22,000)  
Change in assumptions (7,000) 0  
Benefit payments (22,000) (18,000)  
Benefit obligations, end of period 226,000 271,000 297,000
Change in fair value of plan assets:      
Fair value of plan assets, beginning of period 0 0  
Employer contributions 22,000 18,000  
Benefit payments (22,000) (18,000)  
Fair value of plan assets, end of period   0 0
Funded status at year end (226,000) (271,000)  
Director's Retirement Plan      
Change in benefit obligations:      
Benefit obligations, beginning of period 1,306,000 1,299,000  
Service cost 0 56,000 75,000
Interest cost 0 61,000 30,000
Actuarial (gain) / loss 0 0  
Change in assumptions 0 (12,000)  
Benefit payments (1,306,000) (98,000)  
Benefit obligations, end of period 0 1,306,000 1,299,000
Change in fair value of plan assets:      
Fair value of plan assets, beginning of period 0 0  
Employer contributions 1,306,000 98,000  
Benefit payments (1,306,000) (98,000)  
Fair value of plan assets, end of period 0 0 0
Funded status at year end 0 (1,306,000)  
Scottdale Defined Benefit Pension Plan      
Change in benefit obligations:      
Benefit obligations, beginning of period 2,659,000 3,805,000  
Service cost 25,000 58,000  
Interest cost 130,000 197,000  
Settlement (gain) loss 0 (4,000)  
Actuarial (gain) / loss (97,000) 168,000  
Settlement payments 0 (1,472,000)  
Benefit payments (170,000) (93,000)  
Benefit obligations, end of period 2,547,000 2,659,000 3,805,000
Change in fair value of plan assets:      
Fair value of plan assets, beginning of period 3,468,000 4,722,000  
Return on plan assets 328,000 348,000  
Employer contributions 0 0  
Benefit payments (170,000) (93,000)  
Administrative expenses (29,000) (37,000)  
Settlement payments 0 (1,472,000)  
Fair value of plan assets, end of period 3,597,000 3,468,000 4,722,000
Funded status at year end 1,050,000 809,000  
Riverview Defined Benefit Plan      
Change in benefit obligations:      
Benefit obligations, beginning of period 6,442,000 6,424,000  
Interest cost 299,000 309,000  
Actuarial (gain) / loss (483,000) 228,000  
Benefit payments (518,000) (519,000)  
Benefit obligations, end of period 5,740,000 6,442,000 6,424,000
Change in fair value of plan assets:      
Fair value of plan assets, beginning of period 6,895,000 6,720,000  
Return on plan assets 329,000 691,000  
Employer contributions 3,000 3,000  
Benefit payments (516,000) (519,000)  
Fair value of plan assets, end of period 6,711,000 6,895,000 $ 6,720,000
Funded status at year end $ 971,000 $ 453,000