CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest income
Interest and fees on loans	$ 749,812	$ 621,057	$ 1,460,153	$ 1,179,749
Mortgage loans held-for-sale	5,434	4,178	9,580	7,706
Interest-bearing deposits with banks	19,731	16,882	36,389	30,350
Federal funds sold and securities purchased under resale agreements	17	1	36	71
Investment securities	69,779	51,243	139,457	111,186
Trading account securities	13	6	31	20
Federal Home Loan Bank and Federal Reserve Bank stock	4,974	3,544	9,452	7,224
Brokerage customer receivables	219	265	394	560
Total interest income	849,979	697,176	1,655,492	1,336,866
Interest expense
Interest on deposits	335,703	213,495	635,235	358,297
Interest on Federal Home Loan Bank advances	24,797	17,399	46,845	36,534
Interest on other borrowings	8,700	8,485	17,948	16,339
Interest on subordinated notes	5,185	5,523	10,672	11,011
Interest on junior subordinated debentures	4,984	4,737	9,988	9,153
Total interest expense	379,369	249,639	720,688	431,334
Net interest income	470,610	447,537	934,804	905,532
Provision for credit losses	40,061	28,514	61,734	51,559
Net interest income after provision for credit losses	430,549	419,023	873,070	853,973
Non-interest income
Wealth management	35,413	33,858	70,228	63,803
Mortgage banking	29,124	29,981	56,787	48,245
Service charges on deposit accounts	15,546	13,608	30,357	26,511
(Losses) gains on investment securities, net	(4,282)	0	(2,956)	1,398
Fees from covered call options	2,056	2,578	6,903	12,969
Trading gains, net	70	106	747	919
Operating lease income, net	13,938	12,227	28,048	25,273
Other	29,282	20,672	71,613	41,681
Total non-interest income	121,147	113,030	261,727	220,799
Non-interest expense
Salaries and employee benefits	198,541	184,923	393,714	361,704
Software and equipment	29,231	26,205	56,962	50,902
Operating lease equipment	10,834	9,816	21,517	19,649
Occupancy, net	19,585	19,176	38,671	37,662
Data processing	9,503	9,726	18,795	19,135
Advertising and marketing	17,436	17,794	30,476	29,740
Professional fees	9,967	8,940	19,520	17,103
Amortization of other acquisition-related intangible assets	1,122	1,499	2,280	2,734
FDIC insurance	10,429	9,008	24,966	17,677
Other real estate owned expense, net	(259)	118	133	(89)
Other	33,964	33,418	66,464	63,575
Total non-interest expense	340,353	320,623	673,498	619,792
Income before taxes	211,343	211,430	461,299	454,980
Income tax expense	58,955	56,680	121,617	120,032
Net income	152,388	154,750	339,682	334,948
Preferred stock dividends	6,991	6,991	13,982	13,982
Net income applicable to common shares	$ 145,397	$ 147,759	$ 325,700	$ 320,966
Net income per common share-Basic (usd per share)	$ 2.35	$ 2.41	$ 5.28	$ 5.26
Net income per common share-Diluted (usd per share)	2.32	2.38	5.21	5.18
Cash dividends declared per common share (usd per share)	$ 0.45	$ 0.40	$ 0.90	$ 0.80
Weighted average common shares outstanding (in shares)	61,839	61,192	61,660	61,072
Dilutive potential common shares (in shares)	926	902	901	933
Average common shares and dilutive common shares (in shares)	62,765	62,094	62,561	62,005