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Parent Company Only Financial Information - Condensed Statements of Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]          
Interest income $ 423,108 $ 441,042 $ 1,707,993 $ 1,805,160 $ 1,689,673
Dividends received from subsidiaries     (380,000)    
Other income 2,461 1,958 6,039 18,845 35,535
Income tax benefit (50,500) (14,915) (76,695) (128,264) (135,252)
Net income $ 145,596 $ 100,328 511,109 395,043 422,417
Parent Company          
Condensed Financial Statements, Captions [Line Items]          
Interest income     293 668 500
Dividends received from subsidiaries     380,000 380,000 380,000
Other income     582 716 793
Gross income     380,875 381,384 381,293
Operating expenses     51,730 49,926 59,372
Income before income tax benefit and equity in underdistributed earnings of subsidiaries     329,145 331,458 321,921
Income tax benefit     14,163 13,669 16,616
Income before equity in underdistributed earnings of subsidiaries     343,308 345,127 338,537
Equity in underdistributed earnings of subsidiaries     167,801 49,916 83,880
Net income     $ 511,109 $ 395,043 $ 422,417