CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income:
Interest and fees on loans	$ 79,931	$ 72,256	$ 227,701	$ 212,849
Interest and dividends on taxable investments	15,862	15,421	49,376	47,462
Interest on nontaxable investments	2,854	3,226	8,603	10,001
Total interest income	98,647	90,903	285,680	270,312
Interest expense:
Interest on deposits	5,859	2,764	14,526	7,277
Interest on borrowings	347	796	1,397	1,722
Interest on subordinated notes payable	161	0	161	0
Interest on subordinated debt held by unconsolidated subsidiary trusts	1,004	1,145	3,161	3,645
Total interest expense	7,371	4,705	19,245	12,644
Net interest income	91,276	86,198	266,435	257,668
Provision for loan losses	1,751	2,215	5,573	8,342
Net interest income after provision for loan losses	89,525	83,983	260,862	249,326
Noninterest revenues:
Deposit service fees	16,920	16,127	48,780	54,268
Other banking revenues	945	1,536	3,628	3,942
Employee benefit services	24,329	23,265	72,170	68,813
Insurance services	8,527	8,270	24,718	23,044
Wealth management services	6,363	6,168	19,290	19,370
Gain on sales of investment securities, net	0	0	4,882	0
Unrealized gain on equity securities	10	743	28	722
Loss on debt extinguishment	0	(318)	0	(318)
Total noninterest revenues	57,094	55,791	173,496	169,841
Noninterest expenses:
Salaries and employee benefits	56,061	51,062	163,448	155,323
Occupancy and equipment	9,801	9,770	29,708	29,738
Data processing and communications	10,675	10,509	30,475	29,463
Amortization of intangible assets	3,960	4,427	11,994	13,780
Legal and professional fees	2,595	2,522	7,999	8,047
Business development and marketing	2,604	2,587	8,532	7,301
Acquisition expenses	6,061	(832)	7,789	(769)
Other expenses	5,172	5,188	16,812	14,793
Total noninterest expenses	96,929	85,233	276,757	257,676
Income before income taxes	49,690	54,541	157,601	161,491
Income taxes	10,472	11,435	31,422	33,673
Net income	$ 39,218	$ 43,106	$ 126,179	$ 127,818
Basic earnings per share (in dollars per share)	$ 0.76	$ 0.84	$ 2.44	$ 2.49
Diluted earnings per share (in dollars per share)	$ 0.75	$ 0.83	$ 2.41	$ 2.46