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Employee Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Plan [Line Items]      
Matched percentage by employer 50.00%    
Maximum employee percentage of deferred salary matched by employer 6.00%    
Non-elective safe-harbor contribution received each December 31st 3.00%    
Employer contributions $ 990 $ 956 $ 927
Maximum age benefit could be reduced or forfeited 65 years    
Supplemental income benefit liability $ 64 71  
Supplemental income benefit expense $ 29 $ 29 $ 21
Minimum [Member]      
Defined Contribution Plan [Line Items]      
Non-elective safe-harbor contribution received each December 31st 1.00%    
Maximum [Member]      
Defined Contribution Plan [Line Items]      
Non-elective safe-harbor contribution received each December 31st 10.00%