CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest income:
Interest and fees on loans	$ 51,650	$ 45,591
Interest and dividends on taxable investments	13,596	12,060
Interest on nontaxable investments	4,510	4,803
Total interest income	69,756	62,454
Interest expense:
Interest on deposits	1,894	1,800
Interest on borrowings	287	200
Interest on subordinated debt held by unconsolidated subsidiary trusts	694	614
Total interest expense	2,875	2,614
Net interest income	66,881	59,840
Provision for loan losses	1,341	623
Net interest income after provision for loan losses	65,540	59,217
Noninterest revenues:
Deposit service fees	13,734	12,470
Other banking services	1,579	1,055
Employee benefit services	12,011	11,075
Insurance revenues	5,841	399
Wealth management services	5,116	4,047
Total noninterest revenues	38,281	29,046
Noninterest expenses:
Salaries and employee benefits	39,138	31,029
Occupancy and equipment	7,663	7,395
Data processing and communications	8,412	6,990
Amortization of intangible assets	1,442	919
Legal and professional fees	2,516	1,746
Office supplies and postage	1,778	1,580
Business development and marketing	2,013	1,564
FDIC insurance premiums	1,101	989
Acquisition expenses	77	395
Other expenses	3,529	3,341
Total noninterest expenses	67,669	55,948
Income before income taxes	36,152	32,315
Income taxes	11,749	10,018
Net income	$ 24,403	$ 22,297
Basic earnings per share (in dollars per share)	$ 0.55	$ 0.55
Diluted earnings per share (in dollars per share)	0.55	0.54
Cash dividends declared per share (in dollars per share)	$ 0.31	$ 0.30