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Employee Benefit Plans (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in projected benefit obligation:      
Balance, January 1 $ 20,601 $ 19,977  
Service cost 1,179 1,325 $ 981
Interest cost 956 838 732
Actuarial (loss) gain 961 (1,084)  
Benefits paid (464) (455)  
Balance, December 31 23,233 20,601 19,977
Change in plan assets:      
Fair value, January 1 15,031 14,933  
Actual return on plan assets 1,251 (75)  
Employer contribution 772 716  
Expenses paid (88) (88)  
Benefits paid (464) (455)  
Fair value, December 31 16,502 15,031 $ 14,933
Funded status at end of year (6,732) (5,570)  
Accumulated benefit obligation $ 18,586 $ 16,550