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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, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Change in Benefit Obligations [Roll Forward]            
Benefit obligation at beginning of year $ 1,874 $ 1,870 $ 1,967      
Interest cost 77 77 81      
Benefits paid (117) (113) (109)      
Actuarial (gain) loss       $ (235) $ 40 $ (69)
Benefit obligation at end of period 1,599 1,874 1,870      
Funded Status of Plan [Abstract]            
Benefit obligation at end of period (1,599) (1,874) (1,967) (1,599) (1,874) (1,870)
Unamortized (gain) loss       (47) 186 156
Accrued benefit cost       $ (1,646) $ (1,688) $ (1,714)
Weighted average discount rate as of December 31       0.0425 0.0425 0.0425
Components of Net Periodic Benefit Cost [Abstract]            
Interest cost 77 77 81      
Amortization of loss 0 0 4      
Other settlement (income) expense (3) 11 11      
Net periodic benefit cost $ 74 $ 88 $ 96      
Weighted average discount rate for net periodic cost 4.25% 4.25% 4.25%