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:
Loans, including fees	$ 248,895	$ 204,102	$ 648,808	$ 626,881
Loans held for sale	398	635	1,532	1,954
Securities-taxable	43,860	33,936	120,039	98,287
Securities-tax exempt	4,743	4,724	14,116	14,269
Short-term investments	1,841	1,020	6,892	2,111
Total interest income	299,737	244,417	791,387	743,502
Interest expense:
Deposits	13,580	5,090	22,409	21,381
Short-term borrowings	2,749	1,470	5,127	4,558
Long-term debt	3,101	3,148	9,349	13,624
Total interest expense	19,430	9,708	36,885	39,563
Net interest income	280,307	234,709	754,502	703,939
Provision for credit losses	1,402	(26,955)	(30,886)	(49,095)
Net interest income after provision for credit losses	278,905	261,664	785,388	753,034
Noninterest income:
Securities transactions, net			(87)	333
Other income	14,829	22,189	44,814	55,722
Total noninterest income	85,337	93,361	254,422	274,722
Noninterest expense:
Compensation expense	98,985	92,601	279,133	289,034
Employee benefits	19,937	19,377	62,355	85,213
Personnel expense	118,922	111,978	341,488	374,247
Net occupancy expense	12,411	11,974	36,316	37,839
Equipment expense	4,527	4,894	14,097	14,067
Data processing expense	26,768	24,766	77,176	71,598
Professional services expense	9,679	12,748	25,895	37,472
Amortization of intangible assets	3,428	4,082	10,762	12,746
Deposit insurance and regulatory fees	3,596	3,680	10,839	10,042
Other real estate and foreclosed assets income, net	(1,782)	(376)	(3,634)	(456)
Other expense	15,953	20,957	47,599	66,990
Total noninterest expense	193,502	194,703	560,538	624,545
Income before income taxes	170,740	160,322	479,272	403,211
Income taxes expense	35,351	30,740	98,970	77,739
Net income	$ 135,389	$ 129,582	$ 380,302	$ 325,472
Earnings per common share-basic	$ 1.56	$ 1.46	$ 4.35	$ 3.67
Earnings per common share-diluted	1.55	1.46	4.33	3.67
Dividends paid per share	$ 0.27	$ 0.27	$ 0.81	$ 0.81
Weighted average shares outstanding-basic	85,706	86,834	86,141	86,800
Weighted average shares outstanding-diluted	86,020	87,006	86,439	86,951
Service charges on deposit accounts
Noninterest income:
Service charges on deposit accounts	$ 23,272	$ 21,159	$ 65,441	$ 59,686
Trust fees
Noninterest income:
Service charges on deposit accounts	16,048	16,041	48,636	47,351
Bank card and ATM fees
Noninterest income:
Service charges on deposit accounts	21,412	19,833	63,678	58,436
Investment and annuity fees and insurance commissions
Noninterest income:
Service charges on deposit accounts	6,492	7,167	21,920	21,956
Secondary mortgage market operations
Noninterest income:
Service charges on deposit accounts	$ 3,284	$ 6,972	$ 10,020	$ 31,238