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Earnings per Share - Earnings per Basic and Diluted Weighted Average Common Share Outstanding (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share Basic And Diluted [Abstract]        
Net income $ 1,016 $ 3,396 $ 16,083 $ 11,734
Basic weighted-average common shares outstanding 9,449 9,383 9,443 9,375
Effect of potentially dilutive common shares 68 116 55 83
Diluted weighted-average common shares outstanding 9,517 9,499 9,498 9,458
Earnings per basic common share $ 0.11 $ 0.36 $ 1.70 $ 1.25
Earnings per diluted common share $ 0.11 $ 0.36 $ 1.69 $ 1.24
Antidilutive shares not included in diluted common share calculation 93 96 97 120