CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest income:
Interest and fees on loans	$ 52,384	$ 51,650
Interest and dividends on taxable investments	13,566	13,596
Interest and dividends on nontaxable investments	4,008	4,510
Total interest income	69,958	69,756
Interest expense:
Interest on deposits	1,730	1,894
Interest on borrowings	149	287
Interest on subordinated debt held by unconsolidated subsidiary trusts	805	694
Total interest expense	2,684	2,875
Net interest income	67,274	66,881
Provision for loan losses	1,828	1,341
Net interest income after provision for loan losses	65,446	65,540
Noninterest revenues:
Deposit service fees	14,707	13,734
Other banking services	1,159	1,579
Employee benefit services	17,189	12,011
Insurance services	6,400	5,841
Wealth management services	4,861	5,116
Gain on investment securities	2	0
Total noninterest revenues	44,318	38,281
Noninterest expenses:
Salaries and employee benefits	41,400	39,138
Occupancy and equipment	8,196	7,663
Data processing and communications	8,521	8,412
Amortization of intangible assets	2,768	1,442
Legal and professional fees	2,414	2,516
Office supplies and postage	1,674	1,778
Business development and marketing	2,081	2,013
FDIC insurance premiums	753	1,101
Acquisition expenses	1,716	77
Other expenses	4,052	3,529
Total noninterest expenses	73,575	67,669
Income before income taxes	36,189	36,152
Income taxes	9,932	11,749
Net income	$ 26,257	$ 24,403
Basic earnings per share (in dollars per share)	$ 0.58	$ 0.55
Net income per diluted common share (in dollars per share)	0.57	0.55
Cash dividends declared per share (in dollars per share)	$ 0.32	$ 0.31