Condensed Financial Statements of Parent Company - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income:
Income before provision for income taxes	$ 630,852	$ 633,362	$ 604,279
Applicable income tax benefit	(136,544)	(137,313)	(128,736)
Net income	494,308	496,049	475,543
Parent company | Reportable Legal Entities
Income:
Dividends from subsidiaries	180,251	220,124	200,083
Operating income	1	(68)	25
Total income	180,252	220,056	200,108
Operating expenses	39,151	30,514	40,727
Income before provision for income taxes	141,101	189,542	159,381
Applicable income tax benefit	8,177	6,649	9,053
Equity in undistributed earnings of subsidiaries	345,030	299,858	307,109
Net income	$ 494,308	$ 496,049	$ 475,543