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Condensed Financial Statements of Parent Company - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income:      
Income before provision for (benefit of) income taxes $ 633,362 $ 604,279 $ 103,972
Applicable income tax benefit (137,313) (128,736) 16,660
Net income 496,049 475,543 120,632
Parent company | Reportable Legal Entities      
Income:      
Dividends from subsidiaries 220,124 200,083 90,404
Operating income (68) 25 52
Total income 220,056 200,108 90,456
Operating expenses 30,514 40,727 45,574
Income before provision for (benefit of) income taxes 189,542 159,381 44,882
Applicable income tax benefit 6,649 9,053 8,960
Equity in undistributed earnings of subsidiaries 299,858 307,109 66,790
Net income $ 496,049 $ 475,543 $ 120,632