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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Change in benefit obligation        
Benefit obligation at beginning of year     $ 1,928 $ 1,479
Service cost $ 0 $ 5 0 10
Interest cost 18 22 36 44
Benefits paid     (52) (52)
Benefit obligation at end of period 1,912 1,481 1,912 1,481
Funded status        
Benefit obligation at end of period (1,912) (1,481) (1,928) (1,479)
Unamortized (gain) loss 192 (289)    
Accrued benefit cost at end of period (1,720) (1,770)    
Components of net periodic benefit cost        
Service cost 0 5 0 10
Interest cost 18 22 36 44
Net periodic benefit cost $ 18 $ 27 $ 36 $ 54