CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income:
Interest and fees on loans	$ 78,565	$ 73,703
Interest and dividends on taxable investments	15,329	16,087
Interest and dividends on nontaxable investments	3,101	2,891
Total interest income	96,995	92,681
Interest expense:
Interest on deposits	5,545	4,107
Interest on borrowings	558	621
Interest on subordinated notes payable	185	0
Interest on subordinated debt held by unconsolidated subsidiary trusts	653	1,094
Total interest expense	6,941	5,822
Net interest income	90,054	86,859
Provision for credit losses	5,594	2,422
Net interest income after provision for credit losses	84,460	84,437
Noninterest revenues:
Deposit service fees	16,283	15,864
Mortgage banking	916	201
Other banking services	895	1,335
Employee benefit services	25,366	24,054
Insurance services	8,058	7,862
Wealth management services	7,134	6,349
Unrealized (loss) gain on equity securities	(30)	31
Total noninterest revenues	58,622	55,696
Noninterest expenses:
Salaries and employee benefits	58,251	53,379
Occupancy and equipment	10,739	10,288
Data processing and communications	10,413	9,399
Amortization of intangible assets	3,667	4,130
Legal and professional fees	3,151	2,720
Business development and marketing	2,513	2,788
Acquisition expenses	369	534
Other expenses	4,560	5,414
Total noninterest expenses	93,663	88,652
Income before income taxes	49,419	51,481
Income taxes	9,285	9,535
Net income	$ 40,134	$ 41,946
Basic earnings per share (in dollars per share)	$ 0.77	$ 0.81
Diluted earnings per share (in dollars per share)	$ 0.76	$ 0.80