Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 596,425	$ 469,630
Interest bearing funds with Federal Reserve Bank	689,284	644,528
Interest earning deposits with banks	7,661	24,325
Federal funds sold and securities purchased under resale agreements	79,553	80,975
Trading account assets, at fair value	20,318	6,113
Mortgage loans held for sale, at fair value	75,957	45,384
Other loans held for sale	2,764	10,685
Investment securities available for sale, at fair value	3,080,185	3,199,358
Loans, net of deferred fees and costs	20,455,763	20,057,798
Allowance for loan losses	(277,783)	(307,560)
Loans, net	20,177,980	19,750,238
Premises and equipment, net	461,610	468,871
Goodwill	24,431	24,431
Other intangible assets, net	1,678	3,415
Other real estate	101,533	112,629
Deferred tax asset, net	677,513	744,646
Other assets	630,398	616,376
Total assets	26,627,290	26,201,604
LIABILITIES AND SHAREHOLDERS' EQUITY
Non-interest bearing deposits	5,875,301	5,642,751
Interest bearing deposits, excluding brokered deposits	13,668,746	14,140,037
Brokered deposits	1,449,420	1,094,002
Total deposits	20,993,467	20,876,790
Federal funds purchased and securities sold under repurchase agreements	127,840	148,132
Long-term debt	2,256,418	2,033,141
Other liabilities	196,514	194,556
Total liabilities	23,574,239	23,252,619
Shareholders' Equity:
Common stock - $1.00 par value. Authorized 342,857,143 shares; 139,835,110 issued at June 30, 2014 and 139,720,701 issued at December 31, 2013; 139,021,760 outstanding at June 30, 2014 and 138,907,351 outstanding at December 31, 2013	139,835	139,721
Additional paid-in capital	2,976,811	2,976,348
Treasury stock, at cost – 813,350 shares at June 30, 2014 and December 31, 2013	(114,176)	(114,176)
Accumulated other comprehensive loss, net	(13,716)	(41,258)
Accumulated deficit	(61,683)	(137,512)
Total shareholders' equity	3,053,051	2,948,985
Total liabilities and shareholders' equity	26,627,290	26,201,604
Series C Preferred Stock [Member]
Shareholders' Equity:
Series C Preferred Stock – no par value. 5,200,000 shares outstanding at June 30, 2014 and December 31, 2013	$ 125,980	$ 125,862