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Stock Option Grants - Summary of Stock Option Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Number of Shares    
Stock Options Outstanding, Number of Shares, Beginning balance 83,400  
Stock Options Granted, Number of Shares 96,150 83,400
Stock Options Forfeited, Number of Shares 4,000  
Stock Options Outstanding, Number of Shares, Ending balance 175,550 83,400
Stock Options Exercisable, Number of Shares 80,400 72,650
Average Exercise Price    
Stock Options Outstanding, Average Exercise Price, Beginning balance $ 8.09  
Stock Options Granted, Average Exercise Price 8.23 $ 8.09
Stock Options Forfeited, Average Exercise Price 8.08  
Stock Options Outstanding, Average Exercise Price, Ending balance 8.17 8.09
Stock Options Exercisable, Average Exercise Price $ 8.09 $ 8.10