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Employee Benefit Plans (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]    
Prior service costs $ (207) $ (285)
Net accumulated actuarial net loss (3,796) (2,723)
Accumulated other comprehensive loss (4,003) (3,008)
Net periodic benefit cost in excess of cumulative employer contributions (3,944) (3,724)
Net amount recognized at December 31, balance sheet (7,947) (6,732)
Net loss arising during period (1,085) (786)
Prior service cost amortization 79 79
Amortization of net actuarial loss 11 0
Total recognized in other comprehensive loss (995) (707)
Total recognized in net periodic pension cost and other comprehensive income $ 2,398 $ 1,934