CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest income
Interest and fees on loans	$ 558,692	$ 285,698
Mortgage loans held-for-sale	3,528	6,087
Interest-bearing deposits with banks	13,468	1,687
Federal funds sold and securities purchased under resale agreements	70	431
Investment securities	59,943	32,398
Trading account securities	14	5
Federal Home Loan Bank and Federal Reserve Bank stock	3,680	1,772
Brokerage customer receivables	295	174
Total interest income	639,690	328,252
Interest expense
Interest on deposits	144,802	14,854
Interest on Federal Home Loan Bank advances	19,135	4,816
Interest on other borrowings	7,854	2,239
Interest on subordinated notes	5,488	5,482
Interest on junior subordinated debentures	4,416	1,567
Total interest expense	181,695	28,958
Net interest income	457,995	299,294
Provision for credit losses	23,045	4,106
Net interest income after provision for credit losses	434,950	295,188
Non-interest income
Mortgage banking	18,264	77,231
Gains (losses) on investment securities, net	1,398	(2,782)
Fees from covered call options	10,391	3,742
Trading gains, net	813	3,889
Operating lease income, net	13,046	15,475
Other	21,009	18,558
Total non-interest income	107,769	162,790
Non-interest expense
Salaries and employee benefits	176,781	172,355
Software and equipment	24,697	22,810
Operating lease equipment	9,833	9,708
Occupancy, net	18,486	17,824
Data processing	9,409	7,505
Advertising and marketing	11,946	11,924
Professional fees	8,163	8,401
Amortization of other acquisition-related intangible assets	1,235	1,609
FDIC insurance	8,669	7,729
Other real estate owned expense, net	(207)	(1,032)
Other	30,157	25,465
Total non-interest expense	299,169	284,298
Income before taxes	243,550	173,680
Income tax expense	63,352	46,289
Net income	180,198	127,391
Preferred stock dividends	6,991	6,991
Net income applicable to common shares	$ 173,207	$ 120,400
Net income per common share-Basic (usd per share)	$ 2.84	$ 2.11
Net income per common share-Diluted (usd per share)	2.80	2.07
Cash dividends declared per common share (usd per share)	$ 0.40	$ 0.34
Weighted average common shares outstanding (in shares)	60,950	57,196
Dilutive potential common shares (in shares)	873	862
Average common shares and dilutive common shares (in shares)	61,823	58,058
Wealth management
Non-interest income
Revenue from contracts with customers	$ 29,945	$ 31,394
Service charges on deposit accounts
Non-interest income
Revenue from contracts with customers	$ 12,903	$ 15,283