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Quarterly Financial Data - Summarized Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 113,016 | $ 92,820 | $ 72,688 | $ 70,521 | $ 71,275 | $ 71,739 | $ 70,483 | $ 65,433 | $ 349,045 | $ 278,930 | $ 257,074
Recapture of provision for loan losses | 3,000 | 500 | (1,000) | (1,000) | (1,500) | (1,500) | (1,000) | (4,500) |  |  |
Net earnings | $ 43,159 | $ 38,558 | $ 35,373 | $ 34,913 | $ 17,851 | $ 29,683 | $ 28,373 | $ 28,504 | $ 152,003 | $ 104,411 | $ 101,429
Basic earnings per common share | $ 0.31 | $ 0.30 | $ 0.32 | $ 0.32 | $ 0.16 | $ 0.27 | $ 0.26 | $ 0.26 | $ 1.25 | $ 0.95 | $ 0.94
Diluted earnings per common share | $ 0.31 | $ 0.30 | $ 0.32 | $ 0.32 | $ 0.16 | $ 0.27 | $ 0.26 | $ 0.26 | $ 1.24 | $ 0.95 | $ 0.94

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