Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest income:
Loans, including fees	$ 172,781	$ 154,113
Loans held for sale	217	159
Securities-taxable	23,367	23,957
Securities-tax exempt	5,407	1,802
Short-term investments	743	610
Total interest income	202,515	180,641
Interest expense:
Deposits	12,819	11,733
Short-term borrowings	2,941	993
Long-term debt	5,064	5,079
Total interest expense	20,824	17,805
Net interest income	181,691	162,836
Provision for loan losses	15,991	60,036
Net interest income after provision for loan losses	165,700	102,800
Noninterest income:
Service charges on deposit accounts	19,206	18,383
Trust fees	11,211	11,224
Bank card and ATM fees	12,468	11,348
Investment and annuity fees	4,599	4,933
Secondary mortgage market operations	3,567	2,912
Insurance commissions and fees	665	1,307
Amortization of loss share receivable	(1,100)	(1,613)
Other income	12,875	9,346
Securities transactions		346
Total noninterest income	63,491	58,186
Noninterest expense:
Compensation expense	73,099	73,001
Employee benefits	16,020	15,714
Personnel expense	89,119	88,715
Net occupancy expense	10,757	10,356
Equipment expense	3,714	3,774
Data processing expense	15,397	14,207
Professional services expense	11,276	7,621
Amortization of intangibles	4,705	5,124
Telecommunications and postage	3,467	3,361
Deposit insurance and regulatory fees	6,490	5,397
Other real estate expense, net	(13)	768
Other expense	18,630	16,709
Total noninterest expense	163,542	156,032
Income before income taxes	65,649	4,954
Income taxes	16,635	1,115
Net income	$ 49,014	$ 3,839
Earnings per common share-basic	$ 0.57	$ 0.05
Earnings per common share-diluted	0.57	0.05
Dividends paid per share	$ 0.24	$ 0.24
Weighted average shares outstanding-basic	84,365	77,501
Weighted average shares outstanding-diluted	84,624	77,672