CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest income
Interest and fees on loans	$ 402,689	$ 285,587	$ 1,008,888	$ 844,388
Mortgage loans held-for-sale	5,371	7,716	17,198	24,935
Interest-bearing deposits with banks	15,621	2,000	23,098	4,352
Federal funds sold and securities purchased under resale agreements	1,845	0	3,640	0
Investment securities	38,569	25,189	107,508	68,076
Trading account securities	7	3	16	6
Federal Home Loan Bank and Federal Reserve Bank stock	2,109	1,777	5,704	5,291
Brokerage customer receivables	267	185	646	457
Total interest income	466,478	322,457	1,166,698	947,505
Interest expense
Interest on deposits	45,916	19,305	79,755	71,547
Interest on Federal Home Loan Bank advances	6,812	4,931	16,506	14,658
Interest on other borrowings	4,008	2,501	8,981	7,678
Interest on subordinated notes	5,485	5,480	16,484	16,469
Interest on junior subordinated debentures	2,809	2,744	6,426	8,172
Total interest expense	65,030	34,961	128,152	118,524
Net interest income	401,448	287,496	1,038,546	828,981
Provision for credit losses	6,420	(7,916)	30,943	(68,562)
Net interest income after provision for credit losses	395,028	295,412	1,007,603	897,543
Non-interest income
Revenue from contracts with customers	55,723	53,219	165,519	151,720
Mortgage banking	27,221	55,794	137,766	219,872
(Losses) gains on investment securities, net	(3,103)	(2,431)	(13,682)	8
Fees from covered call options	1,366	1,157	6,177	2,545
Trading (losses) gains, net	(7)	58	4,058	39
Operating lease income, net	12,644	12,807	43,126	39,487
Other	15,888	23,409	48,362	59,438
Total non-interest income	101,482	136,474	367,214	452,353
Non-interest expense
Salaries and employee benefits	176,095	170,912	515,776	524,538
Software and equipment	24,126	22,029	71,186	63,807
Operating lease equipment depreciation	9,448	10,013	27,930	30,733
Occupancy, net	17,727	18,158	53,202	55,841
Data processing	7,767	7,104	23,282	20,072
Advertising and marketing	16,600	13,443	45,139	33,294
Professional fees	7,544	7,052	23,821	21,943
Amortization of other acquisition-related intangible assets	1,492	1,877	4,680	5,923
FDIC insurance	7,186	6,750	21,864	19,713
Other real estate owned expense, net	229	(1,531)	(509)	(1,013)
Other	28,255	26,337	83,064	74,294
Total non-interest expense	296,469	282,144	869,435	849,145
Income before taxes	200,041	149,742	505,382	500,751
Income tax expense	57,080	40,605	140,517	133,357
Net income	142,961	109,137	364,865	367,394
Preferred stock dividends	6,991	6,991	20,973	20,973
Net income applicable to common shares	$ 135,970	$ 102,146	$ 343,892	$ 346,421
Net income per common share-Basic (usd per share)	$ 2.24	$ 1.79	$ 5.86	$ 6.08
Net income per common share-Diluted (usd per share)	2.21	1.77	5.78	6.00
Cash dividends declared per common share (usd per share)	$ 0.34	$ 0.31	$ 1.02	$ 0.93
Weighted average common shares outstanding (in shares)	60,738	57,000	58,679	56,985
Dilutive potential common shares (in shares)	837	753	814	728
Average common shares and dilutive common shares (in shares)	61,575	57,753	59,493	57,713
Wealth management
Non-interest income
Revenue from contracts with customers	$ 33,124	$ 31,531	$ 95,887	$ 91,530
Service charges on deposit accounts
Non-interest income
Revenue from contracts with customers	$ 14,349	$ 14,149	$ 45,520	$ 39,434