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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Change in benefit obligation            
Benefit obligation at beginning of year     $ 1,928 $ 1,479    
Service cost $ 0 $ 5 0 15    
Interest cost 18 22 54 66    
Benefits paid     (78) (78)    
Benefit obligation at end of period 1,904 1,482 1,904 1,482    
Funded status            
Benefit obligation at end of period (1,904) (1,482) (1,928) (1,479) $ (1,904) $ (1,482)
Unamortized (gain) loss         192 (289)
Accrued benefit cost at end of period         $ (1,712) $ (1,771)
Components of net periodic benefit cost            
Service cost 0 5 0 15    
Interest cost 18 22 54 66    
Net periodic benefit cost $ 18 $ 27 $ 54 $ 81