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Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Net income per consolidated statements of income $ 5,153 $ 4,143 $ 13,803 $ 11,954
Net income allocated to participating securities (38) (23) (88) (60)
Net income allocated to common stock 5,115 4,120 13,715 11,894
Distributed earnings allocated to common stock 1,385 1,187 3,753 2,165
Undistributed earnings allocated to common stock 3,730 2,933 9,962 9,729
Net income allocated to common stock $ 5,115 $ 4,120 $ 13,715 $ 11,894
Weighted average common shares outstanding, including shares considered participating securities 46,508 47,745 47,104 48,556
Less: Average participating securities (341) (265) (302) (244)
Weighted average shares 46,167 47,480 46,802 48,312
Basic earnings per common share $ 0.11 $ 0.09 $ 0.29 $ 0.25
Weighted average common shares outstanding for basic earnings per common share 46,167 47,480 46,802 48,312
Add: Dilutive effects of assumed exercises of stock options 225 264 214 270
Weighted average shares and dilutive potential common shares 46,392 47,744 47,016 48,582
Diluted earnings per common share $ 0.11 $ 0.09 $ 0.29 $ 0.24