CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest income:
Interest and fees on loans	$ 73,703	$ 69,441
Interest and dividends on taxable investments	16,087	15,525
Interest on nontaxable investments	2,891	3,438
Total interest income	92,681	88,404
Interest expense:
Interest on deposits	4,107	2,132
Interest on borrowings	621	480
Interest on subordinated debt held by unconsolidated subsidiary trusts	1,094	1,168
Total interest expense	5,822	3,780
Net interest income	86,859	84,624
Provision for loan losses	2,422	3,679
Net interest income after provision for loan losses	84,437	80,945
Noninterest revenues:
Deposit service fees	15,864	19,177
Other banking revenues	1,536	1,243
Employee benefit services	24,054	23,006
Insurance services	7,862	7,359
Wealth management services	6,349	6,706
Unrealized gain on equity securities	31	0
Total noninterest revenues	55,696	57,491
Noninterest expenses:
Salaries and employee benefits	53,379	51,859
Occupancy and equipment	10,288	10,531
Data processing and communications	9,399	8,742
Amortization of intangible assets	4,130	4,798
Legal and professional fees	2,720	2,781
Business development and marketing	2,788	2,059
Acquisition expenses	534	(8)
Other expenses	5,414	5,569
Total noninterest expenses	88,652	86,331
Income before income taxes	51,481	52,105
Income taxes	9,535	11,999
Net income	$ 41,946	$ 40,106
Basic earnings per share (in dollars per share)	$ 0.81	$ 0.78
Diluted earnings per share (in dollars per share)	$ 0.80	$ 0.78