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Employee Benefit Plans - Accumulated and Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Employee Benefit Plans    
Prior service costs   $ (49)
Net accumulated actuarial net loss $ (2,311) (4,675)
Accumulated other comprehensive loss (2,311) (4,724)
Net periodic benefit cost in excess of cumulative employer contributions (4,562) (3,596)
Net amount recognized at December 31, balance sheet (6,873) (8,320)
Net gain (loss) arising during period 2,200 (1,455)
Prior service cost amortization 50 79
Amortization of net actuarial loss 164  
Total recognized in other comprehensive loss 2,414 (1,376)
Total recognized in net periodic pension cost and other comprehensive income $ (947) $ 2,709