Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income:
Loans, including fees	$ 358,669	$ 248,895	$ 1,014,726	$ 648,808
Loans held for sale	798	398	1,458	1,532
Securities-taxable	46,934	43,860	142,081	120,039
Securities-tax exempt	4,624	4,743	14,073	14,116
Short-term investments	4,802	1,841	21,365	6,892
Total interest income	415,827	299,737	1,193,703	791,387
Interest expense:
Deposits	130,797	13,580	297,783	22,409
Short-term borrowings	12,732	2,749	58,528	5,127
Long-term debt	3,064	3,101	9,253	9,349
Total interest expense	146,593	19,430	365,564	36,885
Net interest income	269,234	280,307	828,139	754,502
Provision for credit losses	28,498	1,402	42,151	(30,886)
Net interest income after provision for credit losses	240,736	278,905	785,988	785,388
Noninterest income:
Securities transactions, net				(87)
Other income	15,433	14,829	39,470	44,814
Total noninterest income	85,974	85,337	249,529	254,422
Noninterest expense:
Compensation expense	95,650	98,985	282,174	279,133
Employee benefits	20,616	19,937	64,279	62,355
Personnel expense	116,266	118,922	346,453	341,488
Net occupancy expense	13,434	12,411	38,347	36,316
Equipment expense	4,776	4,527	14,555	14,097
Data processing expense	29,822	26,768	87,566	77,176
Professional services expense	9,519	9,679	27,565	25,895
Amortization of intangible assets	2,813	3,428	8,884	10,762
Deposit insurance and regulatory fees	5,851	3,596	18,234	10,839
Other real estate and foreclosed assets expense (income), net	(26)	(1,782)	(153)	(3,634)
Other expense	22,220	15,953	66,246	47,599
Total noninterest expense	204,675	193,502	607,697	560,538
Income before income taxes	122,035	170,740	427,820	479,272
Income taxes expense	24,297	35,351	85,821	98,970
Net income	$ 97,738	$ 135,389	$ 341,999	$ 380,302
Earnings per common share-basic	$ 1.12	$ 1.56	$ 3.93	$ 4.35
Earnings per common share-diluted	1.12	1.55	3.92	4.33
Dividends paid per share	$ 0.30	$ 0.27	$ 0.90	$ 0.81
Weighted average shares outstanding-basic	86,131	85,706	86,082	86,141
Weighted average shares outstanding-diluted	86,437	86,020	86,368	86,439
Service charges on deposit accounts
Noninterest income:
Service charges on deposit accounts	$ 22,264	$ 23,272	$ 64,377	$ 65,441
Trust fees
Noninterest income:
Service charges on deposit accounts	16,593	16,048	50,720	48,636
Bank card and ATM fees
Noninterest income:
Service charges on deposit accounts	20,555	21,412	62,258	63,678
Investment and annuity fees and insurance commissions
Noninterest income:
Service charges on deposit accounts	8,520	6,492	25,628	21,920
Secondary mortgage market operations
Noninterest income:
Service charges on deposit accounts	$ 2,609	$ 3,284	$ 7,076	$ 10,020