Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Detail)

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Quarterly Financial Data (Unaudited) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Interest income $ 29,055 $ 27,743 $ 26,654 $ 25,571 $ 25,058 $ 23,312 $ 22,080 $ 20,961 $ 109,023 $ 91,411 $ 78,146
Interest expense 3,624 3,695 3,749 3,833 3,970 4,093 4,032 3,985 14,901 16,080 15,260
Net interest income 25,431 24,048 22,905 21,738 21,088 19,219 18,048 16,976 94,122 75,331 62,886
Provision for loan losses 2,449 1,185 3,083 2,383 2,507 2,740 1,494 2,231 9,100 8,972 10,350
Net income available to common stockholders $ 8,457 $ 9,202 $ 8,231 $ 8,155 $ 6,487 $ 6,035 $ 5,845 $ 4,871 $ 34,045 $ 23,238 $ 17,378
Net income per common share, basic $ 1.40 $ 1.53 $ 1.38 $ 1.37 $ 1.10 $ 1.03 $ 1.02 $ 0.88 $ 5.68 $ 4.03 $ 3.15
Net income per common share, diluted $ 1.23 $ 1.35 $ 1.21 $ 1.20 $ 0.97 $ 0.90 $ 0.89 $ 0.77 $ 4.99 $ 3.53 $ 2.84