CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income:
Interest and fees on loans	$ 74,067	$ 71,152	$ 147,770	$ 140,593
Interest and dividends on taxable investments	17,427	16,517	33,514	32,041
Interest on nontaxable investments	2,858	3,336	5,749	6,775
Total interest income	94,352	91,005	187,033	179,409
Interest expense:
Interest on deposits	4,560	2,381	8,667	4,513
Interest on borrowings	429	446	1,050	926
Interest on subordinated debt held by unconsolidated subsidiary trusts	1,063	1,332	2,157	2,500
Total interest expense	6,052	4,159	11,874	7,939
Net interest income	88,300	86,846	175,159	171,470
Provision for loan losses	1,400	2,448	3,822	6,127
Net interest income after provision for loan losses	86,900	84,398	171,337	165,343
Noninterest revenues:
Deposit service fees	15,996	18,964	31,860	38,141
Other banking revenues	1,147	1,163	2,683	2,406
Employee benefit services	23,787	22,542	47,841	45,548
Insurance services	8,329	7,415	16,191	14,774
Wealth management services	6,578	6,496	12,927	13,202
Gain on sale of investment securities, net	4,882	0	4,882	0
Unrealized (loss) gain on equity securities	(13)	(21)	18	(21)
Total noninterest revenues	60,706	56,559	116,402	114,050
Noninterest expenses:
Salaries and employee benefits	54,008	52,402	107,387	104,261
Occupancy and equipment	9,619	9,437	19,907	19,968
Data processing and communications	10,401	10,212	19,800	18,954
Amortization of intangible assets	3,904	4,555	8,034	9,353
Legal and professional fees	2,684	2,745	5,404	5,525
Business development and marketing	3,140	2,654	5,928	4,714
Acquisition expenses	1,194	71	1,728	63
Other expenses	6,226	4,036	11,640	9,605
Total noninterest expenses	91,176	86,112	179,828	172,443
Income before income taxes	56,430	54,845	107,911	106,950
Income taxes	11,415	10,239	20,950	22,238
Net income	$ 45,015	$ 44,606	$ 86,961	$ 84,712
Basic earnings per share (in dollars per share)	$ 0.87	$ 0.87	$ 1.68	$ 1.65
Diluted earnings per share (in dollars per share)	$ 0.86	$ 0.86	$ 1.66	$ 1.63