Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 386,402	$ 469,630
Interest bearing funds with Federal Reserve Bank	750,446	644,528
Interest earning deposits with banks	13,612	24,325
Federal funds sold and securities purchased under resale agreements	70,918	80,975
Trading account assets, at fair value	12,705	6,113
Mortgage loans held for sale, at fair value	72,333	45,384
Other loans held for sale	338	10,685
Investment securities available for sale, at fair value	3,050,257	3,199,358
Loans, net of deferred fees and costs	20,588,566	20,057,798
Allowance for loan losses	(269,376)	(307,560)
Loans, net	20,319,190	19,750,238
Premises and equipment, net	456,633	468,871
Goodwill	24,431	24,431
Other intangible assets, net	1,471	3,415
Other real estate	81,636	112,629
Deferred tax asset, net	656,151	744,646
Other assets	622,587	616,376
Total assets	26,519,110	26,201,604
LIABILITIES AND SHAREHOLDERS' EQUITY
Non-interest bearing deposits	5,813,809	5,642,751
Interest bearing deposits, excluding brokered deposits	13,609,038	14,140,037
Brokered deposits	1,566,934	1,094,002
Total deposits	20,989,781	20,876,790
Federal funds purchased and securities sold under repurchase agreements	107,160	148,132
Long-term debt	2,130,934	2,033,141
Other liabilities	214,690	194,556
Total liabilities	23,442,565	23,252,619
Shareholders' Equity:
Common stock - $1.00 par value. Authorized 342,857,143 shares; 139,877,971 issued at September 30, 2014 and 139,720,701 issued at December 31, 2013; 139,064,621 outstanding at September 30, 2014 and 138,907,351 outstanding at December 31, 2013	139,878	139,721
Additional paid-in capital	2,974,319	2,976,348
Treasury stock, at cost – 813,350 shares at September 30, 2014 and December 31, 2013	(114,176)	(114,176)
Accumulated other comprehensive loss, net	(24,827)	(41,258)
Accumulated deficit	(24,629)	(137,512)
Total shareholders' equity	3,076,545	2,948,985
Total liabilities and shareholders' equity	26,519,110	26,201,604
Series C Preferred Stock [Member]
Shareholders' Equity:
Series C Preferred Stock – no par value. 5,200,000 shares outstanding at September 30, 2014 and December 31, 2013	$ 125,980	$ 125,862