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 Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings per common share        
Weighted average common shares outstanding 6,005,242 5,886,178 5,977,590 5,709,334
Net income available to common stockholders $ 9,202 $ 6,035 $ 25,589 $ 16,751
Basic earnings per common share $ 1.53 $ 1.03 $ 4.28 $ 2.93
Weighted average common shares outstanding 6,005,242 5,886,178 5,977,590 5,709,334
Dilutive effects of assumed conversions and exercise of stock options and warrants 942,187 996,631 954,088 962,579
Weighted average common and dilutive potential common shares outstanding 6,947,429 6,882,809 6,931,678 6,671,913
Net income available to common stockholders 9,202 6,035 25,589 16,751
Effect of interest expense on covertible debt, net of tax and discretionary expenditures related to conversion 143 150 426 444
Net income available to common stockholders, adjusted for effect of debt conversion $ 9,345 $ 6,185 $ 26,015 $ 17,195
Diluted earnings per common share $ 1.35 $ 0.90 $ 3.75 $ 2.58