Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Interest income:
Loans, including fees	$ 1,383,694	$ 1,375,442	$ 1,189,377
Securities:
Taxable	488,257	396,224	406,289
Tax-exempt	239,259	218,177	240,131
Interest-bearing deposits	308,751	397,414	376,010
Federal funds sold	196	270	1,288
Resell agreements	590	3,110	4,621
Total interest income	2,420,747	2,390,637	2,217,716
Interest expense:
Deposits	533,265	629,107	508,255
Federal funds purchased	1,079	1,556	1,524
Repurchase agreements	137,908	141,833	135,969
Junior subordinated deferrable interest debentures	7,689	8,872	8,647
Subordinated notes	4,657	4,657	4,657
Total interest expense	684,598	786,025	659,052
Net interest income	1,736,149	1,604,612	1,558,664
Credit loss expense	44,202	64,985	46,171
Net interest income after credit loss expense	1,691,947	1,539,627	1,512,493
Non-interest income:
Trust and investment management fees	177,097	165,270	153,315
Service charges on deposit accounts	121,572	106,230	93,504
Insurance commissions and fees	65,502	61,269	58,271
Interchange and card transaction fees	22,858	21,017	19,419
Other charges, commissions and fees	57,511	53,348	49,026
Net gain (loss) on securities transactions	(850)	(96)	66
Other	55,405	52,060	54,941
Total non-interest income	499,095	459,098	428,542
Non-interest expense:
Salaries and wages	674,647	621,394	547,718
Employee benefits	146,101	122,446	115,306
Net occupancy	136,940	128,751	124,396
Technology, furniture and equipment	165,744	148,487	135,286
Deposit insurance	18,752	37,269	76,589
Other	277,156	244,411	229,367
Total non-interest expense	1,419,340	1,302,758	1,228,662
Income before income taxes	771,702	695,967	712,373
Income taxes	123,145	113,425	114,400
Net income	648,557	582,542	597,973
Preferred stock dividends	6,675	6,675	6,675
Net income available to common shareholders	$ 641,882	$ 575,867	$ 591,298
Earnings per common share:
Basic (in dollars per share)	$ 9.92	$ 8.88	$ 9.11
Diluted (in dollars per share)	$ 9.92	$ 8.87	$ 9.10