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Employee Benefit Plans - Schedule of Reconciliation of Prepaid Pension Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plan      
Prepaid Pension Cost [Roll Forward]      
Prepaid pension cost (liability) as of beginning of fiscal year $ 5,954 $ 6,851  
Net periodic pension cost for fiscal year (766) (897) $ (231)
Actual employer contributions 0 0 0
Benefits paid 1,853 1,736 1,948
Prepaid pension cost (liability) as of end of fiscal year 5,188 5,954 6,851
SERP      
Prepaid Pension Cost [Roll Forward]      
Prepaid pension cost (liability) as of beginning of fiscal year (6,266) (6,608)  
Net periodic pension cost for fiscal year (1) (56) (311)
Benefits paid 331 398  
Prepaid pension cost (liability) as of end of fiscal year $ (5,936) $ (6,266) $ (6,608)