CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Interest and fees on loans	$ 62,351	$ 52,509	$ 114,735	$ 104,159
Interest and dividends on taxable investments	15,175	14,016	28,741	27,612
Interest on nontaxable investments	3,896	4,585	7,904	9,095
Total interest income	81,422	71,110	151,380	140,866
Interest expense:
Interest on deposits	2,065	1,872	3,795	3,766
Interest on borrowings	392	210	541	497
Interest on subordinated debt held by unconsolidated subsidiary trusts	936	722	1,741	1,416
Total interest expense	3,393	2,804	6,077	5,679
Net interest income	78,029	68,306	145,303	135,187
Provision for loan losses	1,461	2,305	3,289	3,646
Net interest income after provision for loan losses	76,568	66,001	142,014	131,541
Noninterest revenues:
Deposit service fees	16,655	15,008	31,362	28,742
Other banking services	1,407	1,597	2,566	3,176
Employee benefit services	20,662	11,671	37,851	23,682
Insurance revenues	6,965	5,797	13,365	11,638
Wealth management services	5,537	4,699	10,398	9,815
Gain on investment securities	0	0	2	0
Total noninterest revenues	51,226	38,772	95,544	77,053
Noninterest expenses:
Salaries and employee benefits	44,808	37,950	86,208	77,088
Occupancy and equipment	8,637	7,409	16,833	15,072
Data processing and communications	10,395	8,732	18,916	17,142
Amortization of intangible assets	4,263	1,403	7,031	2,845
Legal and professional fees	2,619	1,857	5,033	4,374
Office supplies and postage	1,808	1,846	3,482	3,623
Business development and marketing	2,451	2,149	4,532	4,163
FDIC insurance premiums	925	1,090	1,678	2,192
Acquisition expenses	22,896	263	24,612	340
Other expenses	4,077	3,657	8,129	7,186
Total noninterest expenses	102,879	66,356	176,454	134,025
Income before income taxes	24,915	38,417	61,104	74,569
Income taxes	7,724	12,560	17,656	24,309
Net income	$ 17,191	$ 25,857	$ 43,448	$ 50,260
Basic earnings per share (in dollars per share)	$ 0.35	$ 0.58	$ 0.92	$ 1.14
Diluted earnings per share (in dollars per share)	0.35	0.58	0.91	1.13
Cash dividends declared per share (in dollars per share)	$ 0.32	$ 0.31	$ 0.64	$ 0.62