CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income:
Interest and fees on loans	$ 75,825	$ 79,646	$ 231,446	$ 236,931
Interest and dividends on taxable investments	17,361	14,881	49,325	45,633
Interest and dividends on nontaxable investments	2,480	2,963	7,920	9,113
Total interest income	95,666	97,490	288,691	291,677
Interest expense:
Interest on deposits	2,822	3,655	8,897	13,373
Interest on borrowings	195	292	716	1,280
Interest on subordinated notes payable	38	184	115	553
Interest on subordinated debt held by unconsolidated subsidiary trusts	0	394	293	1,501
Total interest expense	3,055	4,525	10,021	16,707
Net interest income	92,611	92,965	278,670	274,970
Provision for credit losses	(944)	1,945	(11,001)	17,313
Net interest income after provision for credit losses	93,555	91,020	289,671	257,657
Noninterest revenues:
Deposit service fees	15,442	14,260	43,758	42,722
Mortgage banking	460	3,908	1,479	6,199
Other banking services	996	924	2,830	2,574
Employee benefit services	29,923	25,159	83,933	74,593
Insurance services	9,176	8,531	25,538	24,772
Wealth management services	8,322	6,889	24,748	20,389
Unrealized (loss) gain on equity securities	(10)	(12)	14	(30)
Total noninterest revenues	64,309	59,659	182,300	171,219
Noninterest expenses:
Salaries and employee benefits	62,883	57,280	178,407	170,252
Occupancy and equipment	9,867	10,134	31,437	30,627
Data processing and communications	12,966	12,096	38,123	33,342
Amortization of intangible assets	3,703	3,581	10,300	10,772
Legal and professional fees	3,352	2,365	8,885	8,577
Business development and marketing	2,383	3,145	7,071	7,162
Litigation accrual	(100)	2,950	(100)	2,950
Acquisition expenses	102	796	133	4,537
Other expenses	5,280	4,619	12,969	13,313
Total noninterest expenses	100,436	96,966	287,225	281,532
Income before income taxes	57,428	53,713	184,746	147,344
Income taxes	12,092	10,904	38,616	29,153
Net income	$ 45,336	$ 42,809	$ 146,130	$ 118,191
Basic earnings per share (in dollars per share)	$ 0.84	$ 0.80	$ 2.70	$ 2.23
Diluted earnings per share (in dollars per share)	$ 0.83	$ 0.79	$ 2.68	$ 2.22