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Postretirement Benefit Plans - Net Periodic Benefit (Income) Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Recognized net actuarial gain $ (25) $ (63)  
Defined Benefit Postretirement Health And Life Coverage      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 1 $ 2
Interest cost 11 13 8
Amortization of prior service cost 0 10 (24)
Amortization of net (gain) / loss (7) (2) 2
Net periodic postretirement benefit income 5 22 (12)
Director's Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 56 75
Interest cost 0 61 30
Amortization of net (gain) / loss 0 34 20
Net periodic postretirement benefit income 0 151 $ 125
Scottdale Defined Benefit Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 25 58  
Interest cost 130 197  
Expected return on plan assets 153 211  
Net periodic postretirement benefit income (23) (19)  
Riverview Defined Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost 299 309  
Expected return on plan assets (397) (387)  
Amortization of net (gain) / loss 12 0  
Net periodic postretirement benefit income (86) (78)  
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