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Stock Option Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Shares      
Options outstanding at beginning of period 75,000 127,144 134,644
Canceled (75,000) (52,144) (7,500)
Options outstanding at end of period   75,000 127,144
Weighted Average Exercise Price      
Options outstanding at beginning of period $ 20.69 $ 20.20 $ 19.82
Canceled $ 20.69 19.50 13.39
Options outstanding at end of year   $ 20.69 $ 20.20