Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income:
Loans, including fees	$ 1,379,263	$ 940,629	$ 825,862
Loans held for sale	1,723	1,814	2,543
Securities-taxable	189,386	166,731	131,382
Securities-tax exempt	18,627	18,847	18,969
Short-term investments	31,498	9,042	3,502
Total interest income	1,620,497	1,137,063	982,258
Interest expense:
Deposits	443,924	58,439	26,246
Short-term borrowings	66,657	16,191	6,015
Long-term debt	12,317	12,430	16,762
Total interest expense	522,898	87,060	49,023
Net interest income	1,097,599	1,050,003	933,235
Provision for credit losses	59,103	(28,399)	(77,494)
Net interest income after provision for credit losses	1,038,496	1,078,402	1,010,729
Noninterest income:
Securities transactions, net	(65,380)	(87)	333
Other income	71,436	53,911	74,801
Total noninterest income	288,480	331,486	364,334
Noninterest expense:
Compensation expense	376,055	378,482	378,589
Employee benefits	84,740	82,153	103,786
Personnel expense	460,795	460,635	482,375
Net occupancy expense	51,573	48,767	49,786
Equipment expense	18,852	18,573	18,167
Data processing expense	117,694	103,942	96,755
Professional services expense	38,331	36,065	48,678
Amortization of intangibles	11,556	14,033	16,665
Deposit insurance and regulatory fees	49,979	14,889	13,582
Other real estate and foreclosed assets income	(624)	(4,407)	(210)
Other expense	88,692	58,195	81,209
Total noninterest expense	836,848	750,692	807,007
Income before income taxes	490,128	659,196	568,056
Income tax expense	97,526	135,107	104,841
Net income	$ 392,602	$ 524,089	$ 463,215
Earnings per common share - basic	$ 4.51	$ 6	$ 5.23
Earnings per common share - diluted	4.5	5.98	5.22
Dividends paid per share	$ 1.2	$ 1.08	$ 1.08
Weighted average shares outstanding - basic	86,130	86,068	86,823
Weighted average shares outstanding - diluted	86,423	86,394	87,027
Service charges on deposit accounts
Noninterest income:
Service charges on deposit accounts	$ 86,020	$ 87,663	$ 81,032
Trust fees
Noninterest income:
Service charges on deposit accounts	67,565	65,132	62,898
Bank card and ATM fees
Noninterest income:
Service charges on deposit accounts	82,966	84,591	79,074
Investment and annuity fees and insurance commissions
Noninterest income:
Service charges on deposit accounts	36,714	28,752	29,502
Secondary mortgage market operations
Noninterest income:
Service charges on deposit accounts	$ 9,159	$ 11,524	$ 36,694