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Earnings Per Common Share (Basic and Diluted Earnings Per Common Share) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share [Abstract] |  |  |
Net income | $ 331,151 | $ 443,599 | $ 454,918
Less: Preferred stock dividends | 2,016 | 8,063 | 8,063
Redemption of preferred stock | 5,514 | 0 | 0
Net income available to common shareholders | 323,621 | 435,536 | 446,855
Less: Earnings allocated to participating securities | 3,136 | 3,687 | 3,169
Distributed earnings allocated to common stock | 178,863 | 175,540 | 164,268
Undistributed earnings allocated to common stock | 141,622 | 256,309 | 279,418
Net earnings allocated to common stock | $ 320,485 | $ 431,849 | $ 443,686
Weighted-average shares outstanding for basic earnings per common share | 62,727,053 | 62,741,769 | 63,704,508
Dilutive effect of stock compensation | 276,784 | 700,101 | 982,208
Weighted-average shares outstanding for diluted earnings per common share | 63,003,837 | 63,441,870 | 64,686,716

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