CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest income:
Interest and fees on loans	$ 78,720	$ 74,067	$ 157,285	$ 147,770
Interest and dividends on taxable investments	15,423	17,427	30,752	33,514
Interest and dividends on nontaxable investments	3,049	2,858	6,150	5,749
Total interest income	97,192	94,352	194,187	187,033
Interest expense:
Interest on deposits	4,173	4,560	9,718	8,667
Interest on borrowings	430	429	988	1,050
Interest on subordinated notes payable	184	0	369	0
Interest on subordinated debt held by unconsolidated subsidiary trusts	454	1,063	1,107	2,157
Total interest expense	5,241	6,052	12,182	11,874
Net interest income	91,951	88,300	182,005	175,159
Provision for credit losses	9,774	1,400	15,368	3,822
Net interest income after provision for credit losses	82,177	86,900	166,637	171,337
Noninterest revenues:
Deposit service fees	12,179	15,996	28,462	31,860
Mortgage banking	1,375	213	2,291	414
Other banking services	755	934	1,650	2,269
Employee benefit services	24,068	23,787	49,434	47,841
Insurance services	8,183	8,329	16,241	16,191
Wealth management services	6,366	6,578	13,500	12,927
Gain on sale of investment securities, net	0	4,882	0	4,882
Unrealized gain (loss) on equity securities	12	(13)	(18)	18
Total noninterest revenues	52,938	60,706	111,560	116,402
Noninterest expenses:
Salaries and employee benefits	54,721	54,008	112,972	107,387
Occupancy and equipment	9,754	9,619	20,493	19,907
Data processing and communications	10,833	10,401	21,246	19,800
Amortization of intangible assets	3,524	3,904	7,191	8,034
Legal and professional fees	3,061	2,684	6,212	5,404
Business development and marketing	1,504	3,140	4,017	5,928
Acquisition expenses	3,372	1,194	3,741	1,728
Other expenses	4,134	6,226	8,694	11,640
Total noninterest expenses	90,903	91,176	184,566	179,828
Income before income taxes	44,212	56,430	93,631	107,911
Income taxes	8,964	11,415	18,249	20,950
Net income	$ 35,248	$ 45,015	$ 75,382	$ 86,961
Basic earnings per share (in dollars per share)	$ 0.67	$ 0.87	$ 1.44	$ 1.68
Diluted earnings per share (in dollars per share)	$ 0.66	$ 0.86	$ 1.43	$ 1.66