Parent Holding Company Information (Condensed) - Condensed Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Expenses
Compensation and employee benefits									$ 319,303	$ 270,644	$ 253,047
Other operating expenses									87,518	70,609	66,809
Total non-interest expense	$ 128,979	$ 130,060	$ 129,521	$ 130,308	$ 134,047	$ 104,108	$ 100,082	$ 96,585	518,868	434,822	404,811
Income tax benefit	(17,762)	(17,994)	(17,338)	(13,984)	(9,272)	(16,976)	(18,935)	(19,498)	(67,078)	(64,681)	(61,640)
Net Income	$ 79,677	$ 79,338	$ 76,392	$ 67,795	$ 50,709	$ 75,619	$ 77,627	$ 80,802	303,202	284,757	266,400
Comprehensive (Loss) Income									(192,949)	169,026	369,264
Parent Company
Income
Dividends from subsidiaries									123,000	207,000	188,000
Intercompany charges for services									2,880	2,654	2,332
Other income									401	500	954
Total income									126,281	210,154	191,286
Expenses
Compensation and employee benefits									7,003	6,516	5,646
Other operating expenses									10,247	13,624	10,051
Total non-interest expense									17,250	20,140	15,697
Income before income tax benefit and equity in undistributed net income of subsidiaries									109,031	190,014	175,589
Income tax benefit									2,913	3,407	3,108
Income before equity in undistributed net income of subsidiaries									111,944	193,421	178,697
Equity in undistributed net income of subsidiaries									191,258	91,336	87,703
Net Income									303,202	284,757	266,400
Comprehensive (Loss) Income									$ (192,949)	$ 169,026	$ 369,264