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Postretirement Benefit Plans - Schedule of Net Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Postretirement Health And Life Coverage      
Change in benefit obligations:      
Benefit obligations, beginning of period $ 226 $ 271  
Service cost 1 1 $ 1
Interest cost 11 11 13
Change in experience 1 (28)  
Change in assumptions 5 (7)  
Benefit payments (20) (22)  
Benefit obligations, end of period 224 226 271
Change in fair value of plan assets:      
Fair value of plan assets, beginning of period 0 0  
Employer contributions 20 22  
Benefit payments (20) (22)  
Fair value of plan assets, end of period 0 0 0
Funded status at year end (224) (226)  
Director's Retirement Plan      
Change in benefit obligations:      
Benefit obligations, beginning of period 0 1,306  
Service cost 0 0 56
Interest cost 0 0 61
Actuarial gain (loss) 0 0  
Change in assumptions 0 0  
Benefit payments 0 (1,306)  
Benefit obligations, end of period 0 0 1,306
Change in fair value of plan assets:      
Fair value of plan assets, beginning of period 0 0  
Employer contributions 0 1,306  
Benefit payments 0 (1,306)  
Fair value of plan assets, end of period 0 0 0
Funded status at year end 0 0  
Scottdale Defined Benefit Pension Plan      
Change in benefit obligations:      
Benefit obligations, beginning of period 2,547 2,659  
Service cost 15 25 58
Interest cost 136 130 197
Settlement loss 4 0  
Actuarial gain (loss) (35) (97)  
Settlement payments (493) 0  
Benefit payments (87) (170)  
Benefit obligations, end of period 2,087 2,547 2,659
Change in fair value of plan assets:      
Fair value of plan assets, beginning of period 3,597 3,468  
Return on plan assets 415 328  
Employer contributions 0 0  
Benefit payments (87) (170)  
Administrative expenses (29) (29)  
Settlement payments (493) 0  
Fair value of plan assets, end of period 3,403 3,597 3,468
Funded status at year end 1,316 1,050  
Riverview Defined Benefit Plan      
Change in benefit obligations:      
Benefit obligations, beginning of period 5,740 6,442  
Interest cost 302 299 309
Actuarial gain (loss) (8) (483)  
Benefit payments (508) (518)  
Benefit obligations, end of period 5,526 5,740 6,442
Change in fair value of plan assets:      
Fair value of plan assets, beginning of period 6,711 6,895  
Return on plan assets 697 329  
Employer contributions 0 3  
Benefit payments (505) (516)  
Fair value of plan assets, end of period 6,903 6,711 $ 6,895
Funded status at year end $ 1,377 $ 971