Parent Holding Company Information (Condensed) - Condensed Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Expenses
Compensation and employee benefits									$ 336,906	$ 309,048	$ 319,303
Other operating expenses									104,320	86,988	87,518
Total non-interest expense	$ 140,965	$ 144,708	$ 140,952	$ 151,843	$ 132,196	$ 129,576	$ 130,604	$ 134,982	578,468	527,358	518,868
Income tax benefit	(11,739)	(11,167)	(9,504)	(3,750)	(7,796)	(11,734)	(12,727)	(12,424)	(36,160)	(44,681)	(67,078)
Net Income	$ 61,754	$ 51,055	$ 44,708	$ 32,627	$ 54,316	$ 52,445	$ 54,955	$ 61,211	190,144	222,927	303,202
Comprehensive Income (Loss)									254,961	317,606	(192,949)
Parent Company
Income
Dividends from subsidiaries									235,000	175,000	123,000
Intercompany charges for services									3,251	2,271	2,880
Other income									3,032	1,444	401
Total income									241,283	178,715	126,281
Expenses
Compensation and employee benefits									8,142	6,552	7,003
Other operating expenses									13,536	11,167	10,247
Total non-interest expense									21,678	17,719	17,250
Income before income tax benefit and equity in undistributed net income of subsidiaries									219,605	160,996	109,031
Income tax benefit									3,177	3,096	2,913
Income before equity in undistributed net income of subsidiaries									222,782	164,092	111,944
Equity in (distributed) undistributed net income of subsidiaries									(32,638)	58,835	191,258
Net Income									190,144	222,927	303,202
Comprehensive Income (Loss)									$ 254,961	$ 317,606	$ (192,949)