Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest income:
Loans, including fees	$ 1,375,442	$ 1,189,377	$ 770,391
Securities:
Taxable	396,224	406,289	249,797
Tax-exempt	218,177	240,131	237,626
Interest-bearing deposits	397,414	376,010	216,367
Federal funds sold	270	1,288	948
Resell agreements	3,110	4,621	592
Total interest income	2,390,637	2,217,716	1,475,721
Interest expense:
Deposits	629,107	508,255	140,476
Federal funds purchased	1,556	1,524	690
Repurchase agreements	141,833	135,969	34,443
Junior subordinated deferrable interest debentures	8,872	8,647	4,172
Subordinated notes	4,657	4,657	4,657
Total interest expense	786,025	659,052	184,438
Net interest income	1,604,612	1,558,664	1,291,283
Credit loss expense	64,985	46,171	3,000
Net interest income after credit loss expense	1,539,627	1,512,493	1,288,283
Non-interest income:
Trust and investment management fees	165,270	153,315	154,679
Service charges on deposit accounts	106,230	93,504	91,891
Insurance commissions and fees	61,269	58,271	53,210
Interchange and card transaction fees	21,017	19,419	18,231
Other charges, commissions and fees	53,348	49,026	41,590
Net gain (loss) on securities transactions	(96)	66	0
Other	52,060	54,941	45,217
Total non-interest income	459,098	428,542	404,818
Non-interest expense:
Salaries and wages	621,394	547,718	492,096
Employee benefits	122,446	115,306	88,608
Net occupancy	128,751	124,396	112,495
Technology, furniture and equipment	148,487	135,286	120,771
Deposit insurance	37,269	76,589	15,603
Other	244,411	229,367	194,701
Total non-interest expense	1,302,758	1,228,662	1,024,274
Income before income taxes	695,967	712,373	668,827
Income taxes	113,425	114,400	89,677
Net income	582,542	597,973	579,150
Preferred stock dividends	6,675	6,675	6,675
Net income available to common shareholders	$ 575,867	$ 591,298	$ 572,475
Earnings per common share:
Basic (in dollars per share)	$ 8.88	$ 9.11	$ 8.84
Diluted (in dollars per share)	$ 8.87	$ 9.10	$ 8.81