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Employee Benefit Plans (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Components of net pension cost        
Net periodic pension cost for the three and six months ended (actual) $ 405 $ 335 $ 810 $ 671
Pension Benefits        
Components of net pension cost        
Service cost - benefits earned during the year     1,620 1,343
Interest costs on projected benefit obligations [1]     1,033 1,009
Expected return on plan assets [1]     (1,267) (1,124)
Expected administrative expenses [1]     93 88
Amortization of prior service cost [1]     79 79
Amortization of unrecognized net loss [1]     138 11
Net periodic pension cost     1,696 1,406
Net periodic pension cost for the three and six months ended (actual) $ 405 $ 335 $ 810 $ 671
[1] The components of net periodic pension cost other than the service cost component are included in other non-interest expense.