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Quarterly Financial Data - Summarized Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 55,109 | $ 53,973 | $ 52,595 | $ 54,589 | $ 55,644 | $ 59,744 | $ 462,960 | $ 58,602 | $ 216,266 | $ 236,950 | $ 234,681
Provision for loan losses | (6,800) | (3,750) | (6,200) |  |  |  |  |  | (16,750) |  | 7,068
Net earnings | $ 25,288 | $ 24,239 | $ 24,466 | $ 21,615 | $ 22,136 | $ 9,257 | $ 23,619 | $ 22,268 | $ 95,608 | $ 77,280 | $ 81,733
Basic earnings per common share | $ 0.24 | $ 0.23 | $ 0.23 | $ 0.21 | $ 0.21 | $ 0.09 | $ 0.23 | $ 0.21 | $ 0.91 | $ 0.74 | $ 0.77
Diluted earnings per common share | $ 0.24 | $ 0.23 | $ 0.23 | $ 0.21 | $ 0.21 | $ 0.09 | $ 0.23 | $ 0.21 | $ 0.91 | $ 0.74 | $ 0.77

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