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Employee Benefit Plans (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Components of net pension cost        
Pension expense - three months ended and nine months ended September 30, (actual) $ 349 $ 307 $ 1,052 $ 920
Pension        
Components of net pension cost        
Service cost - benefits earned during the year     1,343 1,179
Interest costs on projected benefit obligations     1,008 956
Expected return on plan assets     (1,126) (1,057)
Expected administrative expenses     88 70
Amortization of prior service cost     79 79
Amortization of unrecognized net loss     11 0
Net periodic pension expense     1,403 1,227
Pension expense - three months ended and nine months ended September 30, (actual) $ 349 $ 307 $ 1,052 $ 920