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Pension and Other Postretirement Benefit Plans - Amounts in AOCI to be Recognized as Components of Net Periodic Expense (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Net Actuarial loss (gain) $ 389
Prior Service cost (credit) (85)
Total 304
Retirement Plan [Member]  
Net Actuarial loss (gain) 444
Prior Service cost (credit) 0
Total 444
Other Postretirement Benefits Plan [Member]  
Net Actuarial loss (gain) 0
Prior Service cost (credit) (85)
Total (85)
Directors' Plan [Member]  
Net Actuarial loss (gain) (55)
Prior Service cost (credit) 0
Total $ (55)