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Postretirement Benefit Plans - Net Periodic Benefit (Income) Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Recognized net actuarial gain $ (63) $ (7)  
Defined Benefit Postretirement Health And Life Coverage      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 2 $ 2
Interest cost 13 8 9
Amortization of prior service cost 10 (24) (25)
Amortization of net loss (2) 2 9
Net periodic postretirement benefit income 22 (12) (5)
Director's Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 56 75 47
Interest cost 61 30 26
Amortization of net loss 34 20 7
Net periodic postretirement benefit income 151 125 $ 80
Scottdale Defined Benefit Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 58 69  
Interest cost 197 144  
Expected return on plan assets 211 237  
Net periodic postretirement benefit income (19) (31)  
Riverview Defined Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost 309 223  
Expected return on plan assets (387) (522)  
Net periodic postretirement benefit income (78) (299)  
Riverview Defined Benefit Postretirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0  
Interest cost 1 1  
Unrecognized gain (1) (1)  
Net periodic postretirement benefit income $ 0 $ 0