CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income
Interest and fees on loans	$ 666,260	$ 402,689	$ 1,846,009	$ 1,008,888
Mortgage loans held-for-sale	4,767	5,371	12,473	17,198
Interest-bearing deposits with banks	26,866	15,621	57,216	23,098
Federal funds sold and securities purchased under resale agreements	1,157	1,845	1,228	3,640
Investment securities	59,164	38,569	170,350	107,508
Trading account securities	6	7	26	16
Federal Home Loan Bank and Federal Reserve Bank stock	3,896	2,109	11,120	5,704
Brokerage customer receivables	284	267	844	646
Total interest income	762,400	466,478	2,099,266	1,166,698
Interest expense
Interest on deposits	262,783	45,916	621,080	79,755
Interest on Federal Home Loan Bank advances	17,436	6,812	53,970	16,506
Interest on other borrowings	9,384	4,008	25,723	8,981
Interest on subordinated notes	5,491	5,485	16,502	16,484
Interest on junior subordinated debentures	4,948	2,809	14,101	6,426
Total interest expense	300,042	65,030	731,376	128,152
Net interest income	462,358	401,448	1,367,890	1,038,546
Provision for credit losses	19,923	6,420	71,482	30,943
Net interest income after provision for credit losses	442,435	395,028	1,296,408	1,007,603
Non-interest income
Losses on investment securities, net	(2,357)	(3,103)	(959)	(13,682)
Fees from covered call options	4,215	1,366	17,184	6,177
Trading gains (losses), net	728	(7)	1,647	4,058
Operating lease income, net	13,863	12,644	39,136	43,126
Other	20,888	15,888	62,569	48,362
Total non-interest income	112,478	101,482	333,277	367,214
Non-interest expense
Salaries and employee benefits	192,338	176,095	554,042	515,776
Software and equipment	25,951	24,126	76,853	71,186
Operating lease equipment	12,020	9,448	31,669	27,930
Occupancy, net	21,304	17,727	58,966	53,202
Data processing	10,773	7,767	29,908	23,282
Advertising and marketing	18,169	16,600	47,909	45,139
Professional fees	8,887	7,544	25,990	23,821
Amortization of other acquisition-related intangible assets	1,408	1,492	4,142	4,680
FDIC insurance	9,748	7,186	27,425	21,864
Other real estate owned expense, net	120	229	31	(509)
Other	29,337	28,255	92,912	83,064
Total non-interest expense	330,055	296,469	949,847	869,435
Income before taxes	224,858	200,041	679,838	505,382
Income tax expense	60,660	57,080	180,692	140,517
Net income	164,198	142,961	499,146	364,865
Preferred stock dividends	6,991	6,991	20,973	20,973
Net income applicable to common shares	$ 157,207	$ 135,970	$ 478,173	$ 343,892
Net income per common share-Basic (usd per share)	$ 2.57	$ 2.24	$ 7.82	$ 5.86
Net income per common share-Diluted (usd per share)	2.53	2.21	7.71	5.78
Cash dividends declared per common share (usd per share)	$ 0.40	$ 0.34	$ 1.20	$ 1.02
Weighted average common shares outstanding (in shares)	61,213	60,738	61,119	58,679
Dilutive potential common shares (in shares)	964	837	888	814
Average common shares and dilutive common shares (in shares)	62,177	61,575	62,007	59,493
Wealth management
Non-interest income
Revenue from contracts with customers	$ 33,529	$ 33,124	$ 97,332	$ 95,887
Mortgage banking
Non-interest income
Revenue from contracts with customers	27,395	27,221	75,640	137,766
Service charges on deposit accounts
Non-interest income
Revenue from contracts with customers	$ 14,217	$ 14,349	$ 40,728	$ 45,520