Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Loans, including fees	$ 261,971	$ 232,974	$ 511,319	$ 462,892
Investment securities available for sale	20,266	16,685	40,099	33,655
Trading account assets	21	12	49	34
Mortgage loans held for sale	505	650	972	1,238
Federal Reserve Bank balances	1,304	1,020	2,515	2,019
Other earning assets	1,443	1,052	2,957	1,878
Total interest income	285,510	252,393	557,911	501,716
Interest expense:
Deposits	18,118	16,200	35,075	32,214
Federal funds purchased and securities sold under repurchase agreements	45	51	84	96
Long-term debt	16,250	14,693	31,728	29,763
Total interest expense	34,413	30,944	66,887	62,073
Net interest income	251,097	221,449	491,024	439,643
Provision for loan losses	10,260	6,693	18,934	16,070
Net interest income after provision for loan losses	240,837	214,756	472,090	423,573
Non-interest income:
Service charges on deposit accounts	19,820	20,240	39,593	39,950
Fiduciary and asset management fees	12,524	11,580	24,676	22,854
Brokerage revenue	7,210	7,338	14,436	13,821
Mortgage banking income	5,784	5,941	11,548	11,425
Bankcard fees	8,253	8,346	16,438	16,718
Investment securities gains (losses), net	(1)	0	7,667	67
(Decrease) increase in fair value of private equity investments, net	(1,352)	113	(3,166)	(278)
Other fee income	6,164	5,280	11,033	10,084
Other non-interest income	10,299	9,048	18,314	16,392
Total non-interest income	68,701	67,886	140,539	131,033
Non-interest expense:
Salaries and other personnel expense	105,213	97,061	212,404	198,419
Net occupancy and equipment expense	29,933	26,783	59,264	53,360
Third-party processing expense	13,620	11,698	26,223	22,814
FDIC insurance and other regulatory fees	6,875	6,625	13,645	13,344
Professional fees	7,551	6,938	12,907	13,307
Advertising expense	5,346	7,351	11,258	9,761
Foreclosed real estate expense, net	1,448	4,588	3,582	7,272
Earnout liability adjustment	1,707	0	1,707	0
Merger-related expense	0	0	86	0
Loss on early extinguishment of debt, net	0	0	0	4,735
Fair value adjustment to Visa derivative	0	360	0	720
Restructuring charges, net	13	5,841	6,524	6,981
Other operating expenses	20,041	21,366	41,533	46,131
Total non-interest expense	191,747	188,611	389,133	376,844
Income before income taxes	117,791	94,031	223,496	177,762
Income tax expense	41,788	33,574	75,635	64,773
Net income	76,003	60,457	147,861	112,989
Dividends on preferred stock	2,559	2,559	5,119	5,119
Net income available to common shareholders	$ 73,444	$ 57,898	$ 142,742	$ 107,870
Net income per common share, basic (in dollars per share)	$ 0.60	$ 0.46	$ 1.17	$ 0.85
Net income per common share, diluted (in dollars per share)	$ 0.60	$ 0.46	$ 1.16	$ 0.85
Weighted average common shares outstanding, basic (in shares)	122,203	125,100	122,251	126,164
Weighted average common shares outstanding, diluted (in shares)	123,027	125,699	123,043	126,778