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Earnings Per Share Reconciliation - Schedule of Earnings Per Common Share Reconciliation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings per common share:                      
Net earnings $ 50,056 $ 47,492 $ 41,631 $ 37,980 $ 51,281 $ 50,423 $ 54,481 $ 51,642 $ 177,159 $ 207,827 $ 152,003
Less: Net earnings allocated to restricted stock                 572 488 429
Net earnings allocated to common shareholders                 $ 176,587 $ 207,339 $ 151,574
Weighted average shares outstanding                 136,031,000 139,757,000 121,670,000
Basic earnings per common share $ 0.37 $ 0.35 $ 0.31 $ 0.27 $ 0.37 $ 0.36 $ 0.39 $ 0.37 $ 1.30 $ 1.48 $ 1.25
Diluted earnings per common share:                      
Net income allocated to common shareholders                 $ 176,587 $ 207,339 $ 151,574
Weighted average shares outstanding                 136,031,000 139,757,000 121,670,000
Incremental shares from assumed exercise of outstanding options                 175,000 177,000 287,000
Diluted weighted average shares outstanding                 136,206,000 139,934,000 121,957,000
Diluted earnings per common share $ 0.37 $ 0.35 $ 0.31 $ 0.27 $ 0.37 $ 0.36 $ 0.39 $ 0.37 $ 1.30 $ 1.48 $ 1.24