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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Change in benefit obligation            
Benefit obligation at beginning of year     $ 1,967 $ 1,928    
Service cost $ 0 $ 0 0 0    
Interest cost 21 18 42 36    
Benefits paid     (60) (52)    
Benefit obligation at end of period 1,949 1,912 1,949 1,912    
Funded status            
Benefit obligation at end of period (1,949) (1,912) (1,967) (1,928) $ (1,949) $ (1,912)
Unamortized loss         240 192
Accrued benefit cost at end of period         $ (1,709) $ (1,720)
Components of net periodic benefit cost            
Service cost 0 0 0 0    
Interest cost 21 18 42 36    
Net periodic benefit cost $ 21 $ 18 $ 42 $ 36