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Employee Benefit Plans (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Components of net pension cost    
Net periodic pension cost for the three months ended March 31, (actual) $ 405 $ 336
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 months ended March 31, (actual) $ 405 $ 336
[1] The components of net periodic pension cost other than the service cost component are included in other non-interest expense.