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Condensed Financial Statements of Parent Company - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income:      
Income before provision for income taxes $ 103,972 $ 230,425 $ 224,255
Applicable income tax benefit 16,660 (43,942) (45,384)
Net income 120,632 186,483 178,871
Parent company | Reportable Legal Entities      
Income:      
Dividends from subsidiary 90,404 214,852 117,298
Operating income 52 5,386 67
Total income 90,456 220,238 117,365
Operating expenses 45,574 15,409 15,302
Income before provision for income taxes 44,882 204,829 102,063
Applicable income tax benefit 8,960 1,883 3,055
Equity in undistributed earnings of subsidiary (excess distribution) 66,790 (20,229) 73,753
Net income $ 120,632 $ 186,483 $ 178,871