v3.26.3
Components of Net Periodic Benefit Cost - Net Periodic Benefit Cost (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 104,000 $ 108,000 $ 312,000 $ 323,000
Interest cost 991,000 1,016,000 2,971,000 3,049,000
Expected return on plan assets (1,215,000) (1,094,000) (3,647,000) (3,281,000)
Net Periodic Benefit Cost (120,000) 30,000 (364,000) 91,000
Postretirement Health Coverage        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5,000 3,000 16,000 9,000
Interest cost 37,000 32,000 112,000 96,000
Net amortization of net (gain) loss (30,000) (39,000) (90,000) (117,000)
Net Periodic Benefit Cost $ 12,000 $ (4,000) $ 38,000 $ (12,000)