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Equity Compensation Plans - Restricted Stock Outstanding (Detail) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Shares      
Outstanding at beginning of period (in shares) 109,464 166,941 190,088
Granted (in shares) 141,069 2,574 52,103
Vested (in shares) (42,675) (44,209) (48,615)
Forfeited (in shares) (20,678) (15,842) (26,635)
Balance at End of Period (in shares) 187,180 109,464 166,941
Weighted Average Grant Date Fair Market Value      
Outstanding at beginning of period (usd per share) $ 15.97 $ 15.01 $ 13.12
Granted (usd per share) 19.03 19.42 18.71
Vested (usd per share) 14.87 13.44 12.63
Forfeited (usd per share) 18.74 13.45 13.14
Balance at End of Period (usd per share) $ 18.22 $ 15.97 $ 15.01