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Employee Benefit Plans - Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Change in Benefit Obligations [Roll Forward]            
Benefit obligation at beginning of year $ 1,581 $ 1,599 $ 1,874      
Interest cost 46 66 77      
Benefits paid (97) (97) (117)      
Actuarial (gain) loss       $ (7) $ 13 $ (235)
Benefit obligation at end of period 1,523 1,581 1,599      
Funded Status of Plan [Abstract]            
Benefit obligation at end of period (1,523) (1,599) (1,599) (1,523) (1,581) (1,599)
Unamortized gain (35) (31) (47)      
Accrued benefit cost       $ (1,558) $ (1,612) $ (1,646)
Weighted average discount rate as of December 31       0.0200 0.0300 0.0425
Components of Net Periodic Benefit Cost [Abstract]            
Interest cost 46 66 77      
Amortization of loss 0 0 0      
Other settlement income (2) (2) (3)      
Net periodic benefit cost $ 44 $ 64 $ 74      
Weighted average discount rate for net periodic cost 3.00% 4.25% 4.25%