CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest income
Interest and fees on loans	$ 1,507,726	$ 1,133,528	$ 1,157,249
Mortgage loans held-for-sale	21,195	32,169	20,077
Interest-bearing deposits with banks	43,447	6,606	8,553
Federal funds sold and securities purchased under resale agreements	4,903	173	102
Investment securities	160,600	95,286	99,634
Trading account securities	22	10	37
Federal Home Loan Bank and Federal Reserve Bank stock	8,622	7,067	6,891
Brokerage customer receivables	928	645	477
Total interest income	1,747,443	1,275,484	1,293,020
Interest expense
Interest on deposits	175,202	88,119	189,178
Interest on Federal Home Loan Bank advances	30,329	19,581	18,193
Interest on other borrowings	14,294	9,928	12,773
Interest on subordinated notes	22,004	21,983	21,961
Interest on junior subordinated debentures	10,252	10,916	11,008
Total interest expense	252,081	150,527	253,113
Net interest income	1,495,362	1,124,957	1,039,907
Provision for credit losses	78,589	(59,263)	214,220
Net interest income after provision for credit losses	1,416,773	1,184,220	825,687
Non-interest income
Revenue from contracts with customers	217,719	207,172	170,130
Mortgage banking	155,173	273,010	346,013
Losses on investment securities, net	(20,427)	(1,059)	(1,926)
Fees from covered call options	14,133	3,673	2,292
Trading gains (losses), net	3,752	245	(1,004)
Operating lease income, net	55,510	53,691	47,604
Other	67,724	78,373	65,851
Total non-interest income	461,053	586,120	604,189
Non-interest expense
Salaries and employee benefits	696,107	691,669	626,076
Software and equipment	95,885	87,515	68,496
Operating lease equipment	38,008	40,880	37,915
Occupancy, net	70,965	74,184	69,957
Data processing	31,209	27,279	30,196
Advertising and marketing	59,418	47,275	36,296
Professional fees	33,088	29,494	27,426
Amortization of other acquisition-related intangible assets	6,116	7,734	11,018
FDIC insurance	28,639	27,030	25,004
OREO expense, net	(140)	(1,654)	(921)
Other	117,976	101,138	108,632
Total non-interest expense	1,177,271	1,132,544	1,040,095
Income before taxes	700,555	637,796	389,781
Income tax expense	190,873	171,645	96,791
Net income	509,682	466,151	292,990
Preferred stock dividends	27,964	27,964	21,377
Net income applicable to common shares	$ 481,718	$ 438,187	$ 271,613
Net income per common share-Basic (usd per share)	$ 8.14	$ 7.69	$ 4.72
Net income per common share-Diluted (usd per share)	8.02	7.58	4.68
Cash dividends declared per common share (usd per share)	$ 1.36	$ 1.24	$ 1.12
Weighted average common shares outstanding (in shares)	59,205	56,994	57,523
Dilutive potential common shares (in shares)	886	792	496
Average common shares and dilutive common shares (in shares)	60,091	57,786	58,019
Wealth management
Non-interest income
Revenue from contracts with customers	$ 126,614	$ 124,019	$ 100,336
Service charges on deposit accounts
Non-interest income
Revenue from contracts with customers	$ 58,574	$ 54,168	$ 45,023