Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest income:
Loans, including fees	$ 1,452,402	$ 1,379,263	$ 940,629
Loans held for sale	1,640	1,723	1,814
Securities-taxable	194,227	189,386	166,731
Securities-tax exempt	17,698	18,627	18,847
Short-term investments	27,024	31,498	9,042
Total interest income	1,692,991	1,620,497	1,137,063
Interest expense:
Deposits	574,441	443,924	58,439
Short-term borrowings	24,372	66,657	16,191
Long-term debt	12,257	12,317	12,430
Total interest expense	611,070	522,898	87,060
Net interest income	1,081,921	1,097,599	1,050,003
Provision for credit losses	52,167	59,103	(28,399)
Net interest income after provision for credit losses	1,029,754	1,038,496	1,078,402
Noninterest income:
Securities transactions, net	0	(65,380)	(87)
Other income	60,001	71,436	53,911
Total noninterest income	364,129	288,480	331,486
Noninterest expense:
Compensation expense	380,591	376,055	378,482
Employee benefits	88,786	84,740	82,153
Personnel expense	469,377	460,795	460,635
Net occupancy expense	53,650	51,573	48,767
Equipment expense	17,432	18,852	18,573
Data processing expense	121,880	117,694	103,942
Professional services expense	41,935	38,331	36,065
Amortization of intangibles	9,413	11,556	14,033
Deposit insurance and regulatory fees	24,209	49,979	14,889
Other real estate and foreclosed assets income	(2,469)	(624)	(4,407)
Other expense	84,483	88,692	58,195
Total noninterest expense	819,910	836,848	750,692
Income before income taxes	573,973	490,128	659,196
Income tax expense	113,158	97,526	135,107
Net income	$ 460,815	$ 392,602	$ 524,089
Earnings per common share - basic	$ 5.3	$ 4.51	$ 6
Earnings per common share - diluted	5.28	4.5	5.98
Dividends paid per share	$ 1.5	$ 1.2	$ 1.08
Weighted average shares outstanding - basic	86,346	86,130	86,068
Weighted average shares outstanding - diluted	86,648	86,423	86,394
Service charges on deposit accounts
Noninterest income:
Service charges on deposit accounts	$ 91,105	$ 86,020	$ 87,663
Trust fees
Noninterest income:
Service charges on deposit accounts	71,734	67,565	65,132
Bank card and ATM fees
Noninterest income:
Service charges on deposit accounts	85,491	82,966	84,591
Investment and annuity fees and insurance commissions
Noninterest income:
Service charges on deposit accounts	43,424	36,714	28,752
Secondary mortgage market operations
Noninterest income:
Service charges on deposit accounts	$ 12,374	$ 9,159	$ 11,524