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Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Postretirement Health And Life Coverage      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1 $ 1 $ 1
Interest cost 11 11 13
Amortization of prior service cost 0 0 10
Amortization of net gain (8) (7) (2)
Net periodic postretirement benefit cost 4 5 22
Director's Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 56
Interest cost 0 0 61
Amortization of net gain 0 0 34
Net periodic postretirement benefit cost 0 0 151
Scottdale Defined Benefit Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 15 25 58
Interest cost 136 130 197
Expected return on plan assets (159) (153) (211)
Recognized net actuarial gain (52) (25) (63)
Net periodic postretirement benefit cost (60) (23) (19)
Riverview Defined Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost 302 299 309
Expected return on plan assets (387) (397) (387)
Amortization of net gain 10 12 0
Net periodic postretirement benefit cost (75) (86) (78)
Riverview Defined Benefit Postretirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 1 1 1
Unrecognized gain (1) (1) (1)
Net periodic postretirement benefit cost $ 0 $ 0 $ 0