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
Loans including fees:
Taxable	$ 474,387	$ 331,271	$ 1,334,658	$ 800,535
Nontaxable	11,181	6,461	32,318	14,770
Investment securities:
Taxable	66,924	56,765	191,797	145,633
Nontaxable	10,833	11,086	33,039	32,370
Money market and other interest-earning investments	13,194	935	25,258	3,073
Total interest income	576,519	406,518	1,617,070	996,381
Interest Expense
Deposits	147,428	10,820	310,995	19,201
Federal funds purchased and interbank borrowings	910	720	11,404	722
Securities sold under agreements to repurchase	710	106	2,389	287
Federal Home Loan Bank advances	40,382	13,027	123,466	25,915
Other borrowings	12,003	5,256	30,071	13,410
Total interest expense	201,433	29,929	478,325	59,535
Net interest income	375,086	376,589	1,138,745	936,846
Provision for credit losses	19,068	15,490	47,292	133,391
Net interest income after provision for credit losses	356,018	361,099	1,091,453	803,455
Noninterest Income
Wealth and investment services fees	26,687	25,359	80,128	75,183
Service charges on deposit accounts	18,524	20,042	53,278	54,392
Debit card and ATM fees	10,818	10,608	31,453	29,429
Mortgage banking revenue	5,063	5,360	12,628	19,127
Capital markets income	5,891	8,906	19,003	20,609
Company-owned life insurance	3,740	3,361	11,624	11,456
Debt securities gains (losses), net	(241)	(172)	(5,440)	85
Other income	10,456	6,921	30,574	24,461
Total noninterest income	80,938	80,385	233,248	234,742
Noninterest Expense
Salaries and employee benefits	131,541	147,203	404,715	433,167
Occupancy	25,795	26,418	80,162	73,933
Equipment	8,284	7,328	23,394	20,046
Marketing	9,448	10,361	28,698	23,756
Technology	20,592	20,269	59,850	64,914
Communication	4,075	5,392	12,768	14,687
Professional fees	5,956	6,559	19,085	32,686
FDIC assessment	9,000	6,249	29,028	13,523
Amortization of intangibles	6,040	7,089	18,286	19,070
Amortization of tax credit investments	2,644	2,662	8,167	5,703
Property optimization	0	0	1,559	0
Other expense	21,401	22,914	56,359	54,023
Total noninterest expense	244,776	262,444	742,071	755,508
Income before income taxes	192,180	179,040	582,630	282,689
Income tax expense	44,304	38,887	133,118	55,137
Net income	147,876	140,153	449,512	227,552
Preferred dividends	(4,034)	(4,034)	(12,101)	(10,084)
Net income applicable to common shareholders	$ 143,842	$ 136,119	$ 437,411	$ 217,468
Net income per common share - basic (in dollars per share)	$ 0.49	$ 0.47	$ 1.50	$ 0.81
Net income per common share - diluted (in dollars per share)	$ 0.49	$ 0.47	$ 1.50	$ 0.80
Weighted average number of common shares outstanding - basic (in shares)	290,648	290,961	290,763	269,843
Weighted average number of common shares outstanding - diluted (in shares)	291,717	292,483	291,809	271,123
Dividends per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.42	$ 0.42