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Stock Compensation Plans - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 11,000 9,650  
Value of stock award $ 294 $ 227  
Weighted-average grant date stock prices (in dollars per share) $ 26.74 $ 23.53  
Vested percentage 100.00%    
Allocated share-based compensation expense $ 205 $ 184  
Unrecognized compensation expense related to nonvested share-based plans $ 479    
Period of recognition for unrecognized compensation expense 3 years    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date stock prices (in dollars per share) $ 26.74    
2014 Stock Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized (in shares)     176,866
2014 Stock Incentive Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grants (in shares)     65,783
2014 Stock Incentive Plan | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grants (in shares)     88,433
2007 Stock Incentive Plan and Trust      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized (in shares) 177,496    
2007 Stock Incentive Plan and Trust | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grants (in shares) 13    
2007 Stock Incentive Plan and Trust | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grants (in shares) 56,283