CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income
Interest and fees on loans	$ 2,540,952	$ 1,507,726	$ 1,133,528
Mortgage loans held-for-sale	16,791	21,195	32,169
Interest-bearing deposits with banks	78,978	43,447	6,606
Federal funds sold and securities purchased under resale agreements	1,806	4,903	173
Investment securities	238,587	160,600	95,286
Trading account securities	41	22	10
Federal Home Loan Bank and Federal Reserve Bank stock	14,912	8,622	7,067
Brokerage customer receivables	1,047	928	645
Total interest income	2,893,114	1,747,443	1,275,484
Interest expense
Interest on deposits	906,470	175,202	88,119
Interest on Federal Home Loan Bank advances	72,286	30,329	19,581
Interest on other borrowings	35,280	14,294	9,928
Interest on subordinated notes	22,024	22,004	21,983
Interest on junior subordinated debentures	19,190	10,252	10,916
Total interest expense	1,055,250	252,081	150,527
Net interest income	1,837,864	1,495,362	1,124,957
Provision for credit losses	114,390	78,589	(59,263)
Net interest income after provision for credit losses	1,723,474	1,416,773	1,184,220
Non-interest income
Wealth management	130,607	126,614	124,019
Mortgage banking	83,073	155,173	273,010
Service charges on deposit accounts	55,250	58,574	54,168
Gains (losses) on investment securities, net	1,525	(20,427)	(1,059)
Fees from covered call options	21,863	14,133	3,673
Trading gains, net	1,142	3,752	245
Operating lease income, net	53,298	55,510	53,691
Other	87,348	67,724	78,373
Total non-interest income	434,106	461,053	586,120
Non-interest expense
Salaries and employee benefits	748,013	696,107	691,669
Software and equipment	104,632	95,885	87,515
Operating lease equipment	42,363	38,008	40,880
Occupancy, net	77,068	70,965	74,184
Data processing	38,800	31,209	27,279
Advertising and marketing	65,075	59,418	47,275
Professional fees	34,758	33,088	29,494
Amortization of other acquisition-related intangible assets	5,498	6,116	7,734
FDIC insurance	71,102	28,639	27,030
OREO expense, net	(1,528)	(140)	(1,654)
Other	126,718	117,976	101,138
Total non-interest expense	1,312,499	1,177,271	1,132,544
Income before taxes	845,081	700,555	637,796
Income tax expense	222,455	190,873	171,645
Net income	622,626	509,682	466,151
Preferred stock dividends	27,964	27,964	27,964
Net income applicable to common shares	$ 594,662	$ 481,718	$ 438,187
Net income per common share-Basic (usd per share)	$ 9.72	$ 8.14	$ 7.69
Net income per common share-Diluted (usd per share)	9.58	8.02	7.58
Cash dividends declared per common share (usd per share)	$ 1.60	$ 1.36	$ 1.24
Weighted average common shares outstanding (in shares)	61,149	59,205	56,994
Dilutive potential common shares (in shares)	938	886	792
Average common shares and dilutive common shares (in shares)	62,087	60,091	57,786