CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest income
Interest and fees on loans	$ 320,501	$ 284,701	$ 606,199	$ 558,801
Mortgage loans held-for-sale	5,740	8,183	11,827	17,219
Interest-bearing deposits with banks	5,790	1,153	7,477	2,352
Federal funds sold and securities purchased under resale agreements	1,364	0	1,795	0
Investment securities	36,541	23,623	68,939	42,887
Trading account securities	4	1	9	3
Federal Home Loan Bank and Federal Reserve Bank stock	1,823	1,769	3,595	3,514
Brokerage customer receivables	205	149	379	272
Total interest income	371,968	319,579	700,220	625,048
Interest expense
Interest on deposits	18,985	24,298	33,839	52,242
Interest on Federal Home Loan Bank advances	4,878	4,887	9,694	9,727
Interest on other borrowings	2,734	2,568	4,973	5,177
Interest on subordinated notes	5,517	5,512	10,999	10,989
Interest on junior subordinated debentures	2,050	2,724	3,617	5,428
Total interest expense	34,164	39,989	63,122	83,563
Net interest income	337,804	279,590	637,098	541,485
Provision for credit losses	20,417	(15,299)	24,523	(60,646)
Net interest income after provision for credit losses	317,387	294,889	612,575	602,131
Non-interest income
Revenue from contracts with customers	55,244	50,733	109,796	98,501
Mortgage banking	33,314	50,584	110,545	164,078
(Losses) gains on investment securities, net	(7,797)	1,285	(10,579)	2,439
Fees from covered call options	1,069	1,388	4,811	1,388
Trading gains (losses), net	176	(438)	4,065	(19)
Operating lease income, net	15,007	12,240	30,482	26,680
Other	13,916	20,375	32,474	36,029
Total non-interest income	102,942	129,373	265,732	315,879
Non-interest expense
Salaries and employee benefits	167,326	172,817	339,681	353,626
Software and equipment	24,250	20,866	47,060	41,778
Operating lease equipment depreciation	8,774	9,949	18,482	20,720
Occupancy, net	17,651	17,687	35,475	37,683
Data processing	8,010	6,920	15,515	12,968
Advertising and marketing	16,615	11,305	28,539	19,851
Professional fees	7,876	7,304	16,277	14,891
Amortization of other acquisition-related intangible assets	1,579	2,039	3,188	4,046
FDIC insurance	6,949	6,405	14,678	12,963
Other real estate owned expense, net	294	769	(738)	518
Other	29,344	24,051	54,809	47,957
Total non-interest expense	288,668	280,112	572,966	567,001
Income before taxes	131,661	144,150	305,341	351,009
Income tax expense	37,148	39,041	83,437	92,752
Net income	94,513	105,109	221,904	258,257
Preferred stock dividends	6,991	6,991	13,982	13,982
Net income applicable to common shares	$ 87,522	$ 98,118	$ 207,922	$ 244,275
Net income per common share-Basic (usd per share)	$ 1.51	$ 1.72	$ 3.61	$ 4.29
Net income per common share-Diluted (usd per share)	1.49	1.70	3.56	4.24
Cash dividends declared per common share (usd per share)	$ 0.34	$ 0.31	$ 0.68	$ 0.62
Weighted average common shares outstanding (in shares)	58,063	57,049	57,632	56,977
Dilutive potential common shares (in shares)	775	726	823	691
Average common shares and dilutive common shares (in shares)	58,838	57,775	58,455	57,668
Wealth management
Non-interest income
Revenue from contracts with customers	$ 31,369	$ 30,690	$ 62,763	$ 59,999
Service charges on deposit accounts
Non-interest income
Revenue from contracts with customers	$ 15,888	$ 13,249	$ 31,171	$ 25,285