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Pension and Other Postretirement Benefits - The Components of the Net Pension Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Employee Pension Plan [Member]        
Interest cost $ 128 $ 163 $ 256 $ 326
Amortization of actuarial (gain) loss 122 111 244 222
Expected return on plan assets (274) (257) (548) (514)
Net pension (benefit) expense (24) 17 (48) 34
Directors' Plan [Member]        
Service cost 4 3 8 7
Interest cost 12 16 24 32
Amortization of actuarial (gain) loss (5) (13) (10) (27)
Amortization of past service credit 0 0 0 0
Net pension (benefit) expense 11 6 22 12
Other Post Retirement Benefit Plan Defined Benefit [Member]        
Service cost 73 68 146 137
Interest cost 58 65 116 130
Amortization of actuarial (gain) loss 16   16  
Amortization of past service credit (21) (23) (43) (43)
Net pension (benefit) expense $ 126 $ 110 $ 235 $ 224