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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Basic earnings per common share computation        
NET INCOME $ 5,617 $ 2,951 $ 10,783 $ 7,248
Net earnings allocated to participating securities (25) (15) (46) (34)
Net earnings allocated to common stock 5,592 2,936 10,737 7,214
Weighted average common shares outstanding, including shares considered participating securities 14,450 12,510 14,447 12,502
Less: Average participating securities (60) (57) (56) (53)
Weighted average shares 14,390 12,453 14,391 12,449
Basic earnings per common share $ 0.39 $ 0.24 $ 0.75 $ 0.58
Diluted earnings per common share computation        
Net earnings allocated to common stock 5,592 2,936 10,737 7,214
Weighted average common shares outstanding for basic earnings per common share 14,390 12,453 14,391 12,449
Add: Dilutive effects of assumed exercises of stock options 1 1 2 1
Weighted average shares and dilutive potential common shares 14,391 12,454 14,393 12,450
Diluted earnings per common share $ 0.39 $ 0.24 $ 0.75 $ 0.58
Distributed Earnings Allocated to Common Stock [Member]
        
Basic earnings per common share computation        
Net earnings allocated to common stock 2,375 2,053 4,751 4,107
Undistributed Earnings Allocated to Common Stock [Member]
        
Basic earnings per common share computation        
Net earnings allocated to common stock $ 3,217 $ 883 $ 5,986 $ 3,107