CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest income
Interest and fees on loans	$ 3,043,354	$ 2,540,952	$ 1,507,726
Mortgage loans held-for-sale	21,436	16,791	21,195
Interest-bearing deposits with banks	115,253	78,978	43,447
Federal funds sold and securities purchased under resale agreements	366	1,806	4,903
Investment securities	276,115	238,587	160,600
Trading account securities	48	41	22
Federal Home Loan Bank and Federal Reserve Bank stock	20,060	14,912	8,622
Brokerage customer receivables	965	1,047	928
Total interest income	3,477,597	2,893,114	1,747,443
Interest expense
Interest on deposits	1,343,642	906,470	175,202
Interest on Federal Home Loan Bank advances	99,149	72,286	30,329
Interest on other borrowings	34,480	35,280	14,294
Interest on subordinated notes	18,117	22,024	22,004
Interest on junior subordinated debentures	19,674	19,190	10,252
Total interest expense	1,515,062	1,055,250	252,081
Net interest income	1,962,535	1,837,864	1,495,362
Provision for credit losses	101,047	114,390	78,589
Net interest income after provision for credit losses	1,861,488	1,723,474	1,416,773
Non-interest income
Wealth management	146,227	130,607	126,614
Mortgage banking	93,213	83,073	155,173
Service charges on deposit accounts	65,651	55,250	58,574
Gains (losses) on investment securities, net	(2,602)	1,525	(20,427)
Fees from covered call options	10,196	21,863	14,133
Trading gains, net	504	1,142	3,752
Operating lease income, net	58,710	53,298	55,510
Other	116,426	87,348	67,724
Total non-interest income	488,325	434,106	461,053
Non-interest expense
Salaries and employee benefits	817,108	748,013	696,107
Software and equipment	122,794	104,632	95,885
Operating lease equipment	42,298	42,363	38,008
Occupancy, net	79,213	77,068	70,965
Data processing	39,736	38,800	31,209
Advertising and marketing	61,812	65,075	59,418
Professional fees	40,637	34,758	33,088
Amortization of other acquisition-related intangible assets	12,095	5,498	6,116
FDIC insurance	46,118	71,102	28,639
OREO expense, net	(408)	(1,528)	(140)
Other	141,321	126,718	117,976
Total non-interest expense	1,402,724	1,312,499	1,177,271
Income before taxes	947,089	845,081	700,555
Income tax expense	252,044	222,455	190,873
Net income	695,045	622,626	509,682
Preferred stock dividends	27,964	27,964	27,964
Net income applicable to common shares	$ 667,081	$ 594,662	$ 481,718
Net income per common share-Basic (usd per share)	$ 10.47	$ 9.72	$ 8.14
Net income per common share-Diluted (usd per share)	10.31	9.58	8.02
Cash dividends declared per common share (usd per share)	$ 1.80	$ 1.60	$ 1.36
Weighted average common shares outstanding (in shares)	63,685	61,149	59,205
Dilutive potential common shares (in shares)	1,016	938	886
Average common shares and dilutive common shares (in shares)	64,701	62,087	60,091