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Earnings Per Share - Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Net income $ 5,177 $ 2,109 $ 10,028 $ 7,077
Weighted average shares outstanding (basic) 8,111 8,091 8,109 8,089
Impact of common stock equivalents 11 0 4 0
Weighted average shares outstanding (diluted) 8,122 8,091 8,113 8,089
Basic earnings per share (usd per share) $ 0.64 $ 0.26 $ 1.24 $ 0.87
Diluted earnings per share (usd per share) $ 0.64 $ 0.26 $ 1.24 $ 0.87