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Pension and Other Postretirement Benefits - The Components of the Net Pension Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Employee Pension Plan [Member]    
Interest cost $ 128 $ 163
Amortization of unrecognized (gain) loss 122 111
Expected return on plan assets (274) (257)
Net pension (benefit) expense (24) 17
Directors' Plan [Member]    
Service cost 4 4
Interest cost 12 16
Amortization of unrecognized (gain) loss (5) (14)
Amortization of past service credit 0 0
Net pension (benefit) expense 11 6
Other Post Retirement Benefit Plan Defined Benefit [Member]    
Service cost 73 69
Interest cost 58 65
Amortization of past service credit (21) (20)
Net pension (benefit) expense $ 110 $ 114