CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest income
Interest and fees on loans	$ 832,140	$ 794,163	$ 2,398,499	$ 2,254,316
Mortgage loans held-for-sale	4,757	6,233	13,875	15,813
Interest-bearing deposits with banks	34,992	32,608	106,075	68,997
Federal funds sold and securities purchased under resale agreements	75	277	530	313
Investment securities	86,426	69,592	236,495	209,049
Trading account securities	0	11	11	42
Federal Home Loan Bank and Federal Reserve Bank stock	5,444	5,451	16,144	14,903
Brokerage customer receivables	0	269	78	663
Total interest income	963,834	908,604	2,771,707	2,564,096
Interest expense
Interest on deposits	355,846	362,019	1,009,549	997,254
Interest on Federal Home Loan Bank advances	26,007	26,254	77,172	73,099
Interest on other borrowings	6,887	9,013	20,636	26,961
Interest on subordinated notes	3,717	3,712	11,166	14,384
Interest on junior subordinated debentures	4,367	5,023	13,006	15,011
Total interest expense	396,824	406,021	1,131,529	1,126,709
Net interest income	567,010	502,583	1,640,178	1,437,387
Provision for credit losses	21,768	22,334	67,965	84,068
Net interest income after provision for credit losses	545,242	480,249	1,572,213	1,353,319
Non-interest income
Wealth management	37,188	37,224	108,051	107,452
Mortgage banking	24,451	15,974	68,150	72,761
Service charges on deposit accounts	19,825	16,430	58,689	46,787
Gains on investment securities, net	2,972	3,189	6,818	233
Fees from covered call options	5,619	988	14,689	7,891
Trading gains (losses), net	172	(130)	259	617
Operating lease income, net	15,466	15,335	45,919	43,383
Other	25,134	24,137	68,975	95,750
Total non-interest income	130,827	113,147	371,550	374,874
Non-interest expense
Salaries and employee benefits	219,668	211,261	650,735	604,975
Software and equipment	35,027	31,574	106,266	88,536
Operating lease equipment	10,409	10,518	31,637	32,035
Occupancy, net	20,809	19,945	61,815	58,616
Data processing	11,329	9,984	34,713	28,779
Advertising and marketing	19,027	18,239	50,060	48,715
Professional fees	7,465	9,783	25,752	29,303
Amortization of other acquisition-related intangible assets	5,196	4,042	16,394	6,322
FDIC insurance	11,418	10,512	33,315	35,478
Other real estate owned expense, net	262	(938)	1,410	(805)
Other	39,418	35,767	115,482	102,231
Total non-interest expense	380,028	360,687	1,127,579	1,034,185
Income before taxes	296,041	232,709	816,184	694,008
Income tax expense	79,787	62,708	215,364	184,325
Net income	216,254	170,001	600,820	509,683
Preferred stock dividends	13,295	6,991	27,277	20,973
Preferred stock redemption	14,046	0	14,046	0
Net income applicable to common shares	$ 188,913	$ 163,010	$ 559,497	$ 488,710
Net income per common share-Basic (usd per share)	$ 2.82	$ 2.51	$ 8.37	$ 7.79
Net income per common share-Diluted (usd per share)	2.78	2.47	8.25	7.67
Cash dividends declared per common share (usd per share)	$ 0.50	$ 0.45	$ 1.50	$ 1.35
Weighted average common shares outstanding (in shares)	66,952	64,888	66,871	62,743
Dilutive potential common shares (in shares)	1,028	1,053	945	934
Average common shares and dilutive common shares (in shares)	67,980	65,941	67,816	63,677