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Postretirement Benefit Plans - Net Funded Status (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Postretirement Health And Life Coverage        
Change in benefit obligations:        
Benefit obligations, beginning of period   $ 399,000 $ 342,000  
Service cost   2,000 2,000 $ 3,000
Interest cost   8,000 9,000 13,000
Change in experience   (30,000) 73,000  
Change in assumptions   (67,000) (5,000)  
Benefit payments   (15,000) (22,000)  
Benefit obligations, end of period $ 399,000 297,000 399,000 342,000
Change in fair value of plan assets:        
Fair value of plan assets, beginning of period   0 0  
Employer contributions   15,000 22,000  
Benefit payments   (15,000) (22,000)  
Fair value of plan assets, end of period 0   0 0
Funded status at year end (399,000) (297,000) (399,000)  
Director's Retirement Plan        
Change in benefit obligations:        
Benefit obligations, beginning of period   1,195,000 1,142,000  
Service cost   75,000 47,000 49,000
Interest cost   30,000 26,000 31,000
Actuarial loss   103,000 61,000  
Change in assumptions   (23,000) 25,000  
Benefit payments   (81,000) (106,000)  
Benefit obligations, end of period 1,195,000 1,299,000 1,195,000 1,142,000
Change in fair value of plan assets:        
Fair value of plan assets, beginning of period   0 0  
Employer contributions   81,000 106,000  
Benefit payments   (81,000) (106,000)  
Fair value of plan assets, end of period 0 0 0 0
Funded status at year end (1,195,000) (1,299,000) (1,195,000)  
Scottdale Defined Benefit Pension Plan        
Change in benefit obligations:        
Benefit obligations, beginning of period   4,844,000 5,401,000  
Service cost   69,000 83,000  
Interest cost   144,000 134,000  
Actuarial loss   (1,096,000) (309,000)  
Settlement payments   0 (378,000)  
Benefit payments   (156,000) (87,000)  
Benefit obligations, end of period 4,844,000 3,805,000 4,844,000 5,401,000
Change in fair value of plan assets:        
Fair value of plan assets, beginning of period   5,302,000 4,939,000  
Return on plan assets   (385,000) 582,000  
Employer contributions   0 285,000  
Benefit payments   (156,000) (87,000)  
Administrative expenses   (39,000) (39,000)  
Settlement payments   0 (378,000)  
Fair value of plan assets, end of period 5,302,000 4,722,000 5,302,000 $ 4,939,000
Funded status at year end 458,000 917,000 458,000  
Riverview Defined Benefit Plan        
Change in benefit obligations:        
Benefit obligations, beginning of period 8,278,000 8,165,000    
Interest cost 19,000 223,000    
Actuarial loss (86,000) (1,407,000)    
Benefit payments (46,000) (557,000)    
Benefit obligations, end of period 8,165,000 6,424,000 8,165,000  
Change in fair value of plan assets:        
Fair value of plan assets, beginning of period 8,894,000 8,984,000    
Return on plan assets 136,000 (1,709,000)    
Employer contributions 0 2,000    
Benefit payments (46,000) (557,000)    
Fair value of plan assets, end of period 8,984,000 6,720,000 8,984,000  
Funded status at year end $ 819,000 $ 296,000 $ 819,000