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Stock Compensation - Summary of Changes in Nonvested Restricted Stock Awards (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Nonvested at beginning of period, Shares 103,228 84,600
Granted, Shares 750 52,250
Vested, Shares (150) (33,022)
Nonvested at end of period, Shares 103,828 103,828
Nonvested at beginning of period, Weighted-average Grant Date Fair Value $ 17.35 $ 17.01
Granted, Weighted-average Grant Date Fair Value 18.40 17.65
Vested, Weighted-average Grant Date Fair Value 17.80 16.92
Nonvested at end of period, Weighted-average Grant Date Fair Value $ 17.35 $ 17.35