Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Loans, including fees	$ 1,806,060	$ 1,482,567	$ 1,600,462
Investment securities available for sale	209,951	140,077	178,575
Loans held for sale	34,037	23,809	15,078
Federal Reserve Bank balances	18,117	3,777	2,839
Other earning assets	7,622	3,113	7,541
Total interest income	2,075,787	1,653,343	1,804,495
Interest expense:
Deposits	187,232	74,919	217,777
Long-term debt	79,402	45,349	66,053
Federal funds purchased, securities sold under repurchase agreements, and other borrowings	12,253	128	7,917
Total interest expense	278,887	120,396	291,747
Net interest income	1,796,900	1,532,947	1,512,748
Provision for (reversal of) credit losses	84,553	(106,251)	355,022
Net interest income after provision for credit losses	1,712,347	1,639,198	1,157,726
Non-interest revenue:
Service charges on deposit accounts	93,067	86,310	73,132
Fiduciary and asset management fees	78,414	77,147	63,251
Card fees	61,833	51,399	42,702
Brokerage revenue	67,034	56,439	44,781
Mortgage banking income	17,476	54,371	91,413
Capital markets income	26,702	26,118	27,336
Income from bank-owned life insurance	29,720	38,019	31,297
Investment securities gains (losses), net	0	(799)	78,931
Other non-interest revenue	35,090	61,062	53,670
Total non-interest revenue	409,336	450,066	506,513
Non-interest expense:
Salaries and other personnel expense	681,710	649,426	618,214
Net occupancy, equipment, and software expense	174,730	169,222	169,658
Third-party processing and other services	88,617	86,688	87,992
Professional fees	37,189	32,785	56,899
FDIC insurance and other regulatory fees	29,083	22,355	25,210
Goodwill impairment	0	0	44,877
Restructuring charges	(9,690)	7,223	26,991
Other operating expense	155,867	132,205	149,733
Non-interest expense	1,157,506	1,099,904	1,179,574
Income before income taxes	964,177	989,360	484,665
Income tax expense	206,275	228,893	110,970
Net income	757,902	760,467	373,695
Less: Preferred stock dividends	33,163	33,163	33,163
Net income available to common shareholders	$ 724,739	$ 727,304	$ 340,532
Net income per common share, basic (in dollars per share)	$ 4.99	$ 4.95	$ 2.31
Net income per common share, diluted (in dollars per share)	$ 4.95	$ 4.90	$ 2.30
Weighted average common shares outstanding, basic (in shares)	145,364	147,041	147,415
Weighted average common shares outstanding, diluted (in shares)	146,481	148,495	148,210