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Postretirement Benefit Plans - Net Periodic Benefit (Income) Costs (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]        
Recognized net actuarial gain   $ (7) $ 0  
Defined Benefit Postretirement Health And Life Coverage        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   2 2 $ 3
Interest cost   8 9 13
Amortization of prior service cost   (24) (25) (25)
Amortization of net loss   2 9 0
Net periodic postretirement benefit income   (12) (5) (9)
Director's Retirement Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   75 47 49
Interest cost   30 26 31
Amortization of net loss   20 7 0
Net periodic postretirement benefit income   125 80 $ 80
Scottdale Defined Benefit Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   69 83  
Interest cost   144 134  
Expected return on plan assets   237 (227)  
Net periodic postretirement benefit income   (31) $ (10)  
Riverview Defined Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 19 223    
Expected return on plan assets (46) (522)    
Net periodic postretirement benefit income (27) (299)    
Riverview Defined Benefit Postretirement Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0    
Interest cost 0 1    
Unrecognized gain 0 (1)    
Net periodic postretirement benefit income $ 0 $ 0