Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest income:
Loans, including fees	$ 249,348	$ 229,917
Investment securities available for sale	19,834	16,972
Trading account assets	28	22
Mortgage loans held for sale	467	588
Federal Reserve Bank balances	1,211	999
Other earning assets	1,513	825
Total interest income	272,401	249,323
Interest expense:
Deposits	16,958	16,015
Federal funds purchased and securities sold under repurchase agreements	38	45
Long-term debt	15,478	15,070
Total interest expense	32,474	31,130
Net interest income	239,927	218,193
Provision for loan losses	8,674	9,377
Net interest income after provision for loan losses	231,253	208,816
Non-interest income:
Service charges on deposit accounts	19,774	19,710
Fiduciary and asset management fees	12,151	11,274
Brokerage revenue	7,226	6,483
Mortgage banking income	5,766	5,484
Bankcard fees	8,185	8,372
Investment securities gains, net	7,668	67
Decrease in fair value of private equity investments, net	(1,814)	(391)
Other fee income	4,868	4,804
Other non-interest income	8,015	7,344
Total non-interest income	71,839	63,147
Non-interest expense:
Salaries and other personnel expense	107,191	101,358
Net occupancy and equipment expense	29,331	26,577
Third-party processing expense	12,603	11,116
FDIC insurance and other regulatory fees	6,770	6,719
Professional fees	5,355	6,369
Advertising expense	5,912	2,410
Foreclosed real estate expense, net	2,134	2,684
Merger-related expense	86	0
Loss on early extinguishment of debt, net	0	4,735
Fair value adjustment to Visa derivative	0	360
Restructuring charges, net	6,511	1,140
Other operating expenses	21,495	24,765
Total non-interest expense	197,388	188,233
Income before income taxes	105,704	83,730
Income tax expense	33,847	31,199
Net income	71,857	52,531
Dividends on preferred stock	2,559	2,559
Net income available to common shareholders	$ 69,298	$ 49,972
Net income per common share, basic (in dollars per share)	$ 0.57	$ 0.39
Net income per common share, diluted (in dollars per share)	$ 0.56	$ 0.39
Weighted average common shares outstanding, basic (in shares)	122,300	127,227
Weighted average common shares outstanding, diluted (in shares)	123,059	127,857