Parent Company Condensed Financial Statements - Condensed Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of income
Interest expense on long-term debt	$ 275,350	$ 87,163	$ 217,849
Compensation and employee benefits	477,635	433,728	404,071
(Impairment recoveries) amortization of tax credit and other investments	113,358	122,457	70,082
Other expense	118,166	96,330	92,646
Income tax benefit	(283,571)	(183,396)	(117,968)
NET INCOME	1,128,083	872,981	567,797
Parent Company
Statement of income
Other income	0	11	3
Total income	240,157	200,093	511,112
Interest expense on long-term debt	5,450	2,974	3,877
Compensation and employee benefits	6,708	6,370	6,210
(Impairment recoveries) amortization of tax credit and other investments	(786)	425	1,248
Other expense	2,040	1,306	1,184
Total expense	13,412	11,075	12,519
Income before income tax benefit and equity in undistributed income of subsidiaries	226,745	189,018	498,593
Income tax benefit	4,269	3,005	4,158
Undistributed earnings of subsidiaries, primarily bank	897,069	680,958	65,046
NET INCOME	1,128,083	872,981	567,797
Parent Company | Bank
Statement of income
Dividends from subsidiaries	240,000	200,000	511,000
Parent Company | Nonbank
Statement of income
Dividends from subsidiaries	$ 157	$ 82	$ 109