CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income:
Interest and fees on loans	$ 79,646	$ 79,931	$ 236,931	$ 227,701
Interest and dividends on taxable investments	14,881	15,862	45,633	49,376
Interest and dividends on nontaxable investments	2,963	2,854	9,113	8,603
Total interest income	97,490	98,647	291,677	285,680
Interest expense:
Interest on deposits	3,655	5,859	13,373	14,526
Interest on borrowings	292	347	1,280	1,397
Interest on subordinated notes payable	184	161	553	161
Interest on subordinated debt held by unconsolidated subsidiary trusts	394	1,004	1,501	3,161
Total interest expense	4,525	7,371	16,707	19,245
Net interest income	92,965	91,276	274,970	266,435
Provision for credit losses	1,945	1,751	17,313	5,573
Net interest income after provision for credit losses	91,020	89,525	257,657	260,862
Noninterest revenues:
Deposit service fees	14,260	16,920	42,722	48,780
Mortgage banking	3,908	(138)	6,199	276
Other banking services	924	1,083	2,574	3,352
Employee benefit services	25,159	24,329	74,593	72,170
Insurance services	8,531	8,527	24,772	24,718
Wealth management services	6,889	6,363	20,389	19,290
Gain on sale of investment securities, net	0	0	0	4,882
Unrealized (loss) gain on equity securities	(12)	10	(30)	28
Total noninterest revenues	59,659	57,094	171,219	173,496
Noninterest expenses:
Salaries and employee benefits	57,280	56,061	170,252	163,448
Occupancy and equipment	10,134	9,801	30,627	29,708
Data processing and communications	12,096	10,675	33,342	30,475
Amortization of intangible assets	3,581	3,960	10,772	11,994
Legal and professional fees	2,365	2,595	8,577	7,999
Business development and marketing	3,145	2,604	7,162	8,532
Litigation accrual	2,950	0	2,950	0
Acquisition expenses	796	6,061	4,537	7,789
Other expenses	4,619	5,172	13,313	16,812
Total noninterest expenses	96,966	96,929	281,532	276,757
Income before income taxes	53,713	49,690	147,344	157,601
Income taxes	10,904	10,472	29,153	31,422
Net income	$ 42,809	$ 39,218	$ 118,191	$ 126,179
Basic earnings per share (in dollars per share)	$ 0.80	$ 0.76	$ 2.23	$ 2.44
Diluted earnings per share (in dollars per share)	$ 0.79	$ 0.75	$ 2.22	$ 2.41