CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest income
Interest and fees on loans	$ 794,163	$ 666,260	$ 2,254,316	$ 1,846,009
Mortgage loans held-for-sale	6,233	4,767	15,813	12,473
Interest-bearing deposits with banks	32,608	26,866	68,997	57,216
Federal funds sold and securities purchased under resale agreements	277	1,157	313	1,228
Investment securities	69,592	59,164	209,049	170,350
Trading account securities	11	6	42	26
Federal Home Loan Bank and Federal Reserve Bank stock	5,451	3,896	14,903	11,120
Brokerage customer receivables	269	284	663	844
Total interest income	908,604	762,400	2,564,096	2,099,266
Interest expense
Interest on deposits	362,019	262,783	997,254	621,080
Interest on Federal Home Loan Bank advances	26,254	17,436	73,099	53,970
Interest on other borrowings	9,013	9,384	26,961	25,723
Interest on subordinated notes	3,712	5,491	14,384	16,502
Interest on junior subordinated debentures	5,023	4,948	15,011	14,101
Total interest expense	406,021	300,042	1,126,709	731,376
Net interest income	502,583	462,358	1,437,387	1,367,890
Provision for credit losses	22,334	19,923	84,068	71,482
Net interest income after provision for credit losses	480,249	442,435	1,353,319	1,296,408
Non-interest income
Wealth management	37,224	33,529	107,452	97,332
Mortgage banking	15,974	27,395	72,761	75,640
Service charges on deposit accounts	16,430	14,217	46,787	40,728
Gains (losses) on investment securities, net	3,189	(2,357)	233	(959)
Fees from covered call options	988	4,215	7,891	17,184
Trading (losses) gains, net	(130)	728	617	1,647
Operating lease income, net	15,335	13,863	43,383	39,136
Other	24,137	20,888	95,750	62,569
Total non-interest income	113,147	112,478	374,874	333,277
Non-interest expense
Salaries and employee benefits	211,261	192,338	604,975	554,042
Software and equipment	31,574	25,951	88,536	76,853
Operating lease equipment	10,518	12,020	32,035	31,669
Occupancy, net	19,945	21,304	58,616	58,966
Data processing	9,984	10,773	28,779	29,908
Advertising and marketing	18,239	18,169	48,715	47,909
Professional fees	9,783	8,887	29,303	25,990
Amortization of other acquisition-related intangible assets	4,042	1,408	6,322	4,142
FDIC insurance	10,512	9,748	35,478	27,425
Other real estate owned expense, net	(938)	120	(805)	31
Other	35,767	29,337	102,231	92,912
Total non-interest expense	360,687	330,055	1,034,185	949,847
Income before taxes	232,709	224,858	694,008	679,838
Income tax expense	62,708	60,660	184,325	180,692
Net income	170,001	164,198	509,683	499,146
Preferred stock dividends	6,991	6,991	20,973	20,973
Net income applicable to common shares	$ 163,010	$ 157,207	$ 488,710	$ 478,173
Net income per common share-Basic (usd per share)	$ 2.51	$ 2.57	$ 7.79	$ 7.82
Net income per common share-Diluted (usd per share)	2.47	2.53	7.67	7.71
Cash dividends declared per common share (usd per share)	$ 0.45	$ 0.40	$ 1.35	$ 1.20
Weighted average common shares outstanding (in shares)	64,888	61,213	62,743	61,119
Dilutive potential common shares (in shares)	1,053	964	934	888
Average common shares and dilutive common shares (in shares)	65,941	62,177	63,677	62,007