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Employee Benefit Plans (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of net pension cost      
Service cost - benefits earned during the year $ 1,179 $ 1,325 $ 981
Interest costs on projected benefit obligations 956 838 732
Expected return on plan assets (1,057) (957) (872)
Expected administrative expenses 70 40 40
Amortization of prior service cost 79 79 79
Amortization of unrecognized net loss 0 66 0
Net periodic pension expense $ 1,227 $ 1,391 $ 960