v3.25.2
Pension and Other Postretirement Benefits Plans - The Components of the Net Pension (Benefit) Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Employee Pension Plan        
Interest cost $ 203 $ 194 $ 407 $ 388
Expected return on plan assets (277) (284) (554) (568)
Net postretirement benefit expense (74) (90) (147) (180)
Outside Director Pension Plan        
Service cost 2 2 4 4
Interest cost 12 11 24 22
Amortization of unrecognized gain (25) (38) (50) (76)
Net postretirement benefit expense (11) (25) (22) (50)
Other Postretirement Benefit Plans        
Service cost 38 42 76 84
Interest cost 115 96 230 192
Amortization of unrecognized gain (48) (54) (96) (108)
Net postretirement benefit expense $ 105 $ 84 $ 210 $ 168