Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
ASSETS
Cash and due from banks	$ 420,818	$ 380,799	$ 472,848
Interest-bearing deposits in banks	103,469	83,018	114,741
Total cash and cash equivalents	524,287	463,817	587,589
Investment securities:
Held-to-maturity	2,514,161	2,674,093	2,787,513
Available-for-sale	4,318,688	3,967,735	3,838,509
Other investments	148,367	148,172	147,967
Loans held for sale	3,962	5,472	5,432
Loans	16,343,606	16,076,945	15,705,110
Allowance for loan losses	(149,649)	(153,691)	(148,259)
Net loans	16,193,957	15,923,254	15,556,851
Premises and equipment, net	293,209	319,488	313,819
Goodwill	741,740	741,740	741,740
Intangible assets	56,020	60,628	65,824
Covered other real estate	940	2,134	1,065
Accrued interest receivable and other assets	1,355,256	1,218,071	1,250,705
Total assets	26,150,587	25,524,604	25,297,014
Deposits:
Noninterest-bearing	6,011,531	5,942,248	5,725,850
Interest-bearing	3,477,483	3,476,729	3,304,969
Savings and money market accounts	9,354,868	8,450,123	8,418,716
Certificates and other time deposits	2,108,761	2,238,903	2,224,315
Total deposits	20,952,643	20,108,003	19,673,850
Federal funds purchased and securities sold under agreements to repurchase	686,890	1,037,075	1,519,250
Wholesale borrowings	468,447	580,648	366,074
Long-term debt	526,389	505,173	497,393
Accrued taxes, expenses and other liabilities	469,059	353,610	352,490
Total liabilities	23,103,428	22,584,509	22,409,057
Shareholders' equity:
5.875% Non-Cumulative Perpetual Preferred Stock, Series A, without par value: authorized 115,000 shares; 100,000 issued	100,000	100,000	100,000
Common Stock warrant	0	0	0
Common Stock, without par value; authorized 300,000,000 shares; issued: June 30, 2016, December 31, 2015 and June 30, 2015 - 170,183,515 shares	127,937	127,937	127,937
Capital surplus	1,383,266	1,386,677	1,379,194
Accumulated other comprehensive loss	(29,473)	(79,274)	(67,621)
Retained earnings	1,572,681	1,519,438	1,462,859
Treasury stock, at cost: June 30, 2016 - 4,014,513; December 31, 2015 - 4,425,927; June 30, 2015 - 4,410,939 shares	(107,252)	(114,683)	(114,412)
Total shareholders' equity	3,047,159	2,940,095	2,887,957
Total liabilities and shareholders' equity	$ 26,150,587	$ 25,524,604	$ 25,297,014