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Employee Benefit Plans - Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Change in benefit obligation        
Benefit obligation at beginning of year $ (1,599) $ (1,874)    
Interest cost 17 19    
Benefits paid (28) (28)    
Benefit obligation at end of period (1,588) (1,865)    
Funded status        
Benefit obligation at end of period (1,599) (1,874) $ (1,588) $ (1,865)
Unamortized (gain) loss     (47) 186
Accrued benefit cost at end of period     $ (1,635) $ (1,679)
Components of net periodic benefit cost        
Interest cost 17 19    
Net periodic benefit cost $ 17 $ 19