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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Interest income $ 33,725 $ 32,499 $ 30,692 $ 29,165 $ 29,055 $ 27,743 $ 26,654 $ 25,571 $ 126,081 $ 109,023 $ 91,411
Interest expense 3,610 3,534 3,211 3,264 3,624 3,695 3,749 3,833 13,619 14,901 16,080
Net interest income 30,115 28,965 27,481 25,901 25,431 24,048 22,905 21,738 112,462 94,122 75,331
Provision for loan losses 2,356 3,034 3,334 4,284 2,449 1,185 3,083 2,383 13,008 9,100 8,972
Net income available to common stockholders $ 11,752 $ 10,712 $ 9,586 $ 9,151 $ 8,457 $ 9,202 $ 8,231 $ 8,155 $ 41,217 $ 34,045 $ 23,238
Net income per common share, basic $ 1.64 $ 1.53 $ 1.39 $ 1.44 $ 1.40 $ 1.53 $ 1.38 $ 1.37 $ 6.00 $ 5.68 $ 4.03
Net income per common share, diluted $ 1.58 $ 1.46 $ 1.34 $ 1.31 $ 1.23 $ 1.35 $ 1.21 $ 1.20 $ 5.69 $ 4.99 $ 3.53