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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Employee Pension Plan [Member]        
Interest cost $ 194 $ 203 $ 388 $ 406
Expected return on plan assets (284) (277) (568) (554)
Net postretirement benefit expense (90) (74) (180) (148)
Directors' Plan [Member]        
Service cost 2 2 4 4
Interest cost 11 14 22 29
Amortization of unrecognized loss (38) (40) (76) (80)
Net postretirement benefit expense (25) (24) (50) (47)
Other Post Retirement Benefit Plan Defined Benefit [Member]        
Service cost 42 40 84 80
Interest cost 96 96 192 191
Amortization of unrecognized loss (54) (60) (108) (120)
Net postretirement benefit expense $ 84 $ 76 $ 168 $ 151