Quarterly report pursuant to Section 13 or 15(d)

Basic And Diluted Earning Per Share (Detail)

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Basic And Diluted Earning Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings per common share        
Weighted average common shares outstanding 5,981,218 5,708,871 5,971,630 5,694,871
Net income available to common stockholders $ 8,231 $ 5,845 $ 16,387 $ 10,716
Basic earnings per common share $ 1.38 $ 1.02 $ 2.74 $ 1.88
Weighted average common shares outstanding 5,981,218 5,708,871 5,971,630 5,694,871
Dilutive effects of assumed conversions and exercise of stock options and warrants 952,346 997,082 952,087 962,488
Weighted average common and dilutive potential common shares outstanding 6,933,564 6,705,953 6,923,717 6,657,359
Net income available to common stockholders 8,231 5,845 16,387 10,716
Effect of interest expense on covertible debt, net of tax and discretionary expenditures related to conversion 142 148 283 294
Net income available to common stockholders, adjusted for effect of debt conversion $ 8,373 $ 5,993 $ 16,670 $ 11,010
Diluted earnings per common share $ 1.21 $ 0.89 $ 2.41 $ 1.65