CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest income:
Interest and fees on loans	$ 335,075	$ 308,355	$ 314,779
Interest and dividends on taxable investments	95,371	68,607	62,538
Interest and dividends on nontaxable investments	13,283	10,458	11,961
Total interest income	443,729	387,420	389,278
Interest expense:
Interest on deposits	15,044	11,631	16,761
Interest on borrowings	7,902	930	1,569
Interest on subordinated notes payable	153	154	670
Interest on subordinated debt held by unconsolidated subsidiary trusts	0	293	1,875
Total interest expense	23,099	13,008	20,875
Net interest income	420,630	374,412	368,403
Provision for credit losses	14,773	(8,839)	14,212
Net interest income after provision for credit losses	405,857	383,251	354,191
Noninterest revenues:
Deposit service fees	66,850	59,212	57,370
Mortgage banking	390	1,772	5,301
Other banking services	4,644	3,674	3,753
Employee benefit services	115,408	114,328	101,329
Insurance services	39,810	33,992	32,372
Wealth management services	31,667	33,240	27,879
Unrealized (loss) gain on equity securities	(44)	17	(6)
Gain on debt extinguishment	0	0	421
Total noninterest revenues	258,725	246,235	228,419
Noninterest expenses:
Salaries and employee benefits	257,339	241,501	228,384
Occupancy and equipment	42,413	41,240	40,732
Data processing and communications	54,099	51,003	45,755
Amortization of intangible assets	15,214	14,051	14,297
Legal and professional fees	14,018	11,723	11,605
Business development and marketing	13,095	9,319	9,463
Litigation accrual	0	(100)	2,950
Acquisition expenses	5,021	701	4,933
Acquisition-related contingent consideration adjustment	(300)	200	0
Other expenses	23,369	18,500	18,415
Total noninterest expenses	424,268	388,138	376,534
Income before income taxes	240,314	241,348	206,076
Income taxes	52,233	51,654	41,400
Net income	$ 188,081	$ 189,694	$ 164,676
Basic earnings per share	$ 3.48	$ 3.51	$ 3.10
Diluted earnings per share	$ 3.46	$ 3.48	$ 3.08