CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income:
Interest and fees on loans	$ 69,498	$ 53,706	$ 184,233	$ 157,865
Interest and dividends on taxable investments	15,228	13,344	43,969	40,956
Interest on nontaxable investments	3,761	4,272	11,665	13,367
Total interest income	88,487	71,322	239,867	212,188
Interest expense:
Interest on deposits	2,123	1,776	5,918	5,542
Interest on borrowings	902	337	1,443	835
Interest on subordinated debt held by unconsolidated subsidiary trusts	1,067	746	2,808	2,161
Total interest expense	4,092	2,859	10,169	8,538
Net interest income	84,395	68,463	229,698	203,650
Provision for loan losses	2,314	1,790	5,603	5,436
Net interest income after provision for loan losses	82,081	66,673	224,095	198,214
Noninterest revenues:
Deposit service fees	18,419	14,894	49,781	43,636
Other banking services	1,704	2,863	4,270	6,039
Employee benefit services	20,767	11,267	58,618	34,949
Insurance revenues	6,344	5,702	19,709	17,340
Wealth management services	5,707	5,226	16,105	15,041
Gain on sales of investment securities	0	0	2	0
Total noninterest revenues	52,941	39,952	148,485	117,005
Noninterest expenses:
Salaries and employee benefits	46,568	38,300	132,776	115,388
Occupancy and equipment	9,106	7,373	25,939	22,445
Data processing and communications	9,313	8,744	28,229	25,886
Amortization of intangible assets	4,949	1,359	11,980	4,204
Legal and professional fees	2,764	1,928	7,796	6,302
Office supplies and postage	2,027	1,713	5,510	5,336
Business development and marketing	2,586	2,004	7,119	6,167
FDIC insurance premiums	827	707	2,505	2,899
Acquisition expenses	580	2	25,192	342
Other expenses	5,056	4,096	13,184	11,282
Total noninterest expenses	83,776	66,226	260,230	200,251
Income before income taxes	51,246	40,399	112,350	114,968
Income taxes	16,003	13,239	33,659	37,548
Net income	$ 35,243	$ 27,160	$ 78,691	$ 77,420
Basic earnings per share (in dollars per share)	$ 0.69	$ 0.61	$ 1.62	$ 1.75
Diluted earnings per share (in dollars per share)	0.68	0.61	1.60	1.74
Cash dividends declared per share (in dollars per share)	$ 0.34	$ 0.32	$ 0.98	$ 0.94