Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INTEREST INCOME
Loans	$ 810,007	$ 619,273	$ 585,957
Securities:
Taxable interest	192,121	127,625	105,701
Tax-exempt interest	97,190	98,305	99,820
Total securities income	289,311	225,930	205,521
Federal funds and resell agreements	19,109	10,048	11,840
Interest-bearing due from banks	18,582	5,417	3,744
Trading securities	511	854	1,427
Total interest income	1,137,520	861,522	808,489
INTEREST EXPENSE
Deposits	167,553	26,412	58,214
Federal funds and repurchase agreements	40,703	6,934	11,787
Other	15,467	12,655	7,259
Total interest expense	223,723	46,001	77,260
Net interest income	913,797	815,521	731,229
Provision for credit losses	37,900	20,000	130,500
Net interest income after provision for credit losses	875,897	795,521	600,729
NONINTEREST INCOME
Trust and securities processing	237,207	224,126	194,646
Trading and investment banking	23,201	30,939	32,945
Service charges on deposit accounts	85,167	86,056	83,879
Insurance fees and commissions	1,338	1,309	1,369
Brokerage fees	43,019	12,171	24,350
Bankcard fees	73,451	64,576	60,544
Investment securities gains, net	58,444	5,057	120,634
Other	32,406	42,941	41,799
Total noninterest income	554,233	467,175	560,166
NONINTEREST EXPENSE
Salaries and employee benefits	524,431	504,442	495,464
Occupancy, net	48,848	47,345	47,476
Equipment	74,259	78,398	85,719
Supplies and services	13,590	14,986	15,537
Marketing and business development	25,699	18,533	14,679
Processing fees	82,227	67,563	54,213
Legal and consulting	39,095	32,406	29,765
Bankcard	26,367	19,145	18,954
Amortization of other intangible assets	5,037	4,757	6,517
Regulatory fees	15,378	11,894	10,279
Other	43,188	34,167	43,402
Total noninterest expense	898,119	833,636	822,005
Income before income taxes	532,011	429,060	338,890
Income tax expense	100,329	76,042	52,388
NET INCOME	$ 431,682	$ 353,018	$ 286,502
PER SHARE DATA
Net income – basic	$ 8.93	$ 7.31	$ 5.95
Net income – diluted	8.86	7.24	5.93
Dividends	$ 1.49	$ 1.38	$ 1.25
Weighted average shares outstanding – basic	48,340,922	48,271,462	48,137,791
Weighted average shares outstanding – diluted	48,747,399	48,738,292	48,343,750