Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest income:
Loans, including fees	$ 290,552	$ 166,679	$ 560,267	$ 316,656
Securities:
Taxable	101,960	56,365	199,735	99,423
Tax-exempt	60,637	57,078	127,271	113,944
Interest-bearing deposits	87,748	26,371	186,993	32,714
Federal funds sold	305	99	1,063	112
Resell agreements	1,126	10	2,194	14
Total interest income	542,328	306,602	1,077,523	562,863
Interest expense:
Deposits	120,266	14,593	218,255	19,505
Federal funds purchased	412	75	995	87
Repurchase agreements	33,114	1,790	66,765	2,308
Junior subordinated deferrable interest debentures	2,106	772	4,094	1,356
Subordinated notes	1,164	1,164	2,328	2,328
Total interest expense	157,062	18,394	292,437	25,584
Net interest income	385,266	288,208	785,086	537,279
Credit loss expense	9,901	0	19,005	0
Net interest income after credit loss expense	375,365	288,208	766,081	537,279
Non-interest income:
Trust and investment management fees	39,392	37,776	75,536	76,432
Service charges on deposit accounts	23,487	23,870	45,366	46,610
Insurance commissions and fees	12,940	11,776	31,892	28,384
Interchange and card transaction fees	5,250	4,911	10,139	9,137
Other charges, commissions and fees	12,090	9,887	23,794	19,514
Net gain (loss) on securities transactions	33	0	54	0
Other	10,336	9,707	22,012	19,240
Total non-interest income	103,528	97,927	208,793	199,317
Non-interest expense:
Salaries and wages	133,195	116,881	263,540	228,210
Employee benefits	26,792	20,733	60,714	44,953
Net occupancy	31,714	28,379	62,063	55,790
Technology, furniture and equipment	33,043	29,921	65,524	59,078
Deposit insurance	6,202	3,724	12,447	7,357
Intangible amortization	82	131	178	277
Other	54,014	46,578	105,718	89,414
Total non-interest expense	285,042	246,347	570,184	485,079
Income before income taxes	193,851	139,788	404,690	251,517
Income taxes	31,733	20,674	64,919	33,301
Net income	162,118	119,114	339,771	218,216
Preferred stock dividends	1,669	1,669	3,338	3,338
Net income available to common shareholders	$ 160,449	$ 117,445	$ 336,433	$ 214,878
Earnings per common share:
Basic	$ 2.47	$ 1.82	$ 5.18	$ 3.32
Diluted	$ 2.47	$ 1.81	$ 5.17	$ 3.31