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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
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]          
Net income available to common shareholders $ 137,389 $ 92,121 $ 478,281 $ 362,215 $ 389,589
Less: Dividends paid on and earnings allocated to participating securities (1,795) (1,170) (5,798) (4,333) (4,871)
Earnings applicable to common stock $ 135,594 $ 90,951 $ 472,483 $ 357,882 $ 384,718
Weighted average common shares outstanding 463,292,906 464,993,970 462,605,341 465,380,010 487,287,872
Basic earnings per common share $ 0.29 $ 0.20 $ 1.02 $ 0.77 $ 0.79
Earnings applicable to common stock $ 135,594 $ 90,951 $ 472,483 $ 357,882 $ 384,718
Potential dilutive common shares 594,031 418,674 676,061 283,322  
Total shares for diluted earnings per common share computation 463,886,937 465,412,644 463,281,402 465,663,332 487,287,872
Diluted earnings per common share and common share equivalents $ 0.29 $ 0.20 $ 1.02 $ 0.77 $ 0.79