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Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Net income available to common shareholders $ 478,281 $ 362,215 $ 389,589
Less: Dividends paid on and earnings allocated to participating securities (5,798) (4,333) (4,871)
Earnings applicable to common stock $ 472,483 $ 357,882 $ 384,718
Weighted average common shares outstanding 462,605,341 465,380,010 487,287,872
Basic earnings per common share $ 1.02 $ 0.77 $ 0.79
Earnings applicable to common stock $ 472,483 $ 357,882 $ 384,718
Potential dilutive common shares 676,061 283,322  
Total shares for diluted earnings per common share computation 463,281,402 465,663,332 487,287,872
Diluted earnings per common share and common share equivalents $ 1.02 $ 0.77 $ 0.79