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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
Mar. 31, 2025
Mar. 31, 2024
Employee Pension Plan [Member]    
Interest cost $ 203 $ 194
Expected return on plan assets (277) (284)
Net postretirement benefit expense (74) (90)
Directors' Plan [Member]    
Service cost 2 2
Interest cost 12 11
Amortization of unrecognized gain (25) (38)
Net postretirement benefit expense (11) (25)
Other Post Retirement Benefit Plan Defined Benefit [Member]    
Service cost 38 42
Interest cost 115 96
Amortization of unrecognized gain (48) (54)
Net postretirement benefit expense $ 105 $ 84