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Quarterly Financial Data - Summarized Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Selected Quarterly Financial Information [Abstract]      
Net interest income $ 505,513 $ 414,550 $ 416,053
Provision for loan losses 5,668 (25,500) 23,500
Net earnings $ 235,425 $ 212,521 $ 177,159
Basic earnings per common share $ 1.67 $ 1.57 $ 1.30
Diluted earnings per common share $ 1.67 $ 1.56 $ 1.30