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Parent Company Only Financial Information - Condensed Statements of Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]      
Interest income $ 1,707,993 $ 1,805,160 $ 1,689,673
Dividends received from subsidiaries (380,000)    
Other income 6,039 18,845 35,535
Income tax benefit (76,695) (128,264) (135,252)
Net income 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