Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest income:
Loans, including fees	$ 155,761	$ 146,398	$ 466,591	$ 435,270
Loans held for sale	323	176	731	494
Securities-taxable	21,782	23,631	68,788	66,095
Securities-tax exempt	3,780	839	8,593	2,564
Short-term investments	507	285	1,597	913
Total interest income	182,153	171,329	546,300	505,336
Interest expense:
Deposits	12,590	8,933	36,926	23,680
Short-term borrowings	1,040	273	2,942	631
Long-term debt	5,010	5,293	15,114	14,246
Total interest expense	18,640	14,499	54,982	38,557
Net interest income	163,513	156,830	491,318	466,779
Provision for loan losses	18,972	10,080	96,204	22,842
Net interest income after provision for loan losses	144,541	146,750	395,114	443,937
Noninterest income:
Service charges on deposit accounts	18,716	18,619	55,493	53,842
Trust fees	11,512	11,345	34,825	34,340
Bank card and ATM fees	11,808	11,637	35,110	34,688
Investment and annuity fees	4,289	6,149	14,265	16,037
Secondary mortgage market operations	4,917	3,413	12,005	9,695
Insurance commissions and fees	1,088	2,238	3,635	6,587
Amortization of FDIC loss share receivable	(1,539)	(1,564)	(4,678)	(4,034)
Other income	11,866	8,370	32,768	26,139
Securities transactions	351	4	1,465	337
Total noninterest income	63,008	60,211	184,888	177,631
Noninterest expense:
Compensation expense	70,290	71,187	213,524	206,754
Employee benefits	12,873	12,968	42,591	41,472
Personnel expense	83,163	84,155	256,115	248,226
Net occupancy expense	10,068	11,222	30,818	34,203
Equipment expense	3,349	3,598	10,203	11,623
Data processing expense	14,590	13,844	43,167	41,412
Professional services expense	6,584	7,656	21,917	31,978
Amortization of intangibles	4,886	6,027	15,015	18,493
Telecommunications and postage	3,284	3,485	9,917	10,607
Deposit insurance and regulatory fees	5,969	4,225	17,415	12,033
Other real estate expense, net	(5,214)	422	(4,096)	1,379
Other expense	22,379	16,559	55,561	53,671
Total noninterest expense	149,058	151,193	456,032	463,625
Income before income taxes	58,491	55,768	123,970	157,943
Income taxes	11,772	14,602	26,505	41,789
Net income	$ 46,719	$ 41,166	$ 97,465	$ 116,154
Earnings per common share-basic	$ 0.59	$ 0.52	$ 1.23	$ 1.45
Earnings per common share-diluted	0.59	0.52	1.23	1.45
Dividends paid per share	$ 0.24	$ 0.24	$ 0.72	$ 0.72
Weighted average shares outstanding-basic	77,550	77,928	77,525	78,452
Weighted average shares outstanding-diluted	77,677	78,075	77,653	78,609