Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest income:
Loans, including fees	$ 220,782	$ 217,288	$ 652,807	$ 644,392
Investment securities available for sale	14,926	14,029	43,043	43,775
Trading account assets	34	106	258	357
Mortgage loans held for sale	662	701	2,060	1,719
Federal Reserve Bank balances	821	562	2,413	1,561
Other earning assets	868	708	2,567	2,185
Total interest income	238,093	233,394	703,148	693,989
Interest expense:
Deposits	17,227	13,504	48,859	41,246
Federal funds purchased and securities sold under repurchase agreements	46	35	134	186
Long-term debt	13,030	13,592	39,457	40,728
Total interest expense	30,303	27,131	88,450	82,160
Net interest income	207,790	206,263	614,698	611,829
Provision for loan losses	2,956	3,843	13,990	25,638
Net interest income after provision for loan losses	204,834	202,420	600,708	586,191
Non-interest income:
Service charges on deposit accounts	20,692	20,159	59,621	58,610
Fiduciary and asset management fees	11,308	11,207	34,722	33,536
Brokerage revenue	6,946	7,281	20,978	20,201
Mortgage banking income	5,965	4,665	19,960	13,459
Bankcard fees	8,334	8,182	24,910	24,394
Investment securities gains, net	0	0	2,710	1,331
Other fee income	5,521	4,704	15,371	14,495
Gain on sale of Memphis branches, net	0	0	0	5,789
Other non-interest income	8,293	7,787	23,474	25,740
Total non-interest income	67,059	63,985	201,746	197,555
Non-interest expense:
Salaries and other personnel expense	94,341	93,870	285,394	279,855
Net occupancy and equipment expense	26,937	26,956	79,650	79,436
Third-party processing expense	10,844	10,044	31,858	29,604
FDIC insurance and other regulatory fees	6,591	7,839	20,315	25,369
Professional fees	6,371	2,526	18,382	18,427
Advertising expense	5,488	7,177	11,797	15,935
Foreclosed real estate expense, net	4,503	9,074	18,350	18,818
Visa indemnification charges	363	1,979	1,092	2,731
Restructuring charges, net	69	809	(33)	17,101
Other operating expenses	22,400	33,475	67,816	72,839
Total non-interest expense	177,907	193,749	534,621	560,115
Income before income taxes	93,986	72,656	267,833	223,631
Income tax expense	36,058	25,868	100,149	81,554
Net income	57,928	46,788	167,684	142,077
Dividends on preferred stock	2,559	2,559	7,678	7,678
Net income available to common shareholders	$ 55,369	$ 44,229	$ 160,006	$ 134,399
Net income per common share, basic	$ 0.42	$ 0.32	$ 1.20	$ 0.97
Net income per common share, diluted	$ 0.42	$ 0.32	$ 1.20	$ 0.96
Weighted average common shares outstanding, basic	131,516	139,043	133,120	138,989
Weighted average common shares outstanding, diluted	132,297	139,726	133,876	139,600