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Share Based Compensation Plans - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved to be issued         381,920
Shares to be issued under the Plan     223,788    
Expense on Restricted stock awards $ 57,933 $ 4,346 $ 66,625 $ 13,037  
Unrecognized compensation expense 2,093,779   2,093,779    
Shares to be issued under employee stock purchase plan 164,306   164,306    
Shares purchased by employees 3,668 15,434 6,707 21,609  
Weighted average price $ 15.56 $ 12.47 $ 14.88 $ 11.52  
Compensation expense recognized $ 4,000 $ 77,000 $ 12,000 $ 112,000  
Employee Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved to be issued 167,674   167,674    
Employee stock purchase limit, percentage of annual salary 10.00%   10.00%