Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 1,350,015	$ 1,983,615
Interest-bearing deposits at banks	2,555,354	129,945
Federal funds sold	124,487	3,000
Trading account	378,235	488,966
Investment securities (includes pledged securities that can be sold or repledged of $1,724,073 at June 30, 2013; $1,801,842 at December 31, 2012)
Available for sale (cost: $2,985,526 at June 30, 2013; $4,643,070 at December 31, 2012)	3,085,086	4,739,437
Held to maturity (fair value: $1,737,578 at June 30, 2013; $976,883 at December 31, 2012)	1,819,691	1,032,276
Other (fair value: $305,749 at June 30, 2013; $302,648 at December 31, 2012)	305,749	302,648
Total investment securities	5,210,526	6,074,361
Loans and leases	66,197,178	66,790,186
Unearned discount	(225,312)	(219,229)
Loans and leases, net of unearned discount	65,971,866	66,570,957
Allowance for credit losses	(927,065)	(925,860)
Loans and leases, net	65,044,801	65,645,097
Premises and equipment	595,536	594,652
Goodwill	3,524,625	3,524,625
Core deposit and other intangible assets	89,918	115,763
Accrued interest and other assets	4,355,508	4,448,779
Total assets	83,229,005	83,008,803
Liabilities
Noninterest-bearing deposits	24,074,815	24,240,802
NOW accounts	1,791,995	1,979,619
Savings deposits	35,455,693	33,783,947
Time deposits	4,054,524	4,562,366
Deposits at Cayman Islands office	284,443	1,044,519
Total deposits	65,661,470	65,611,253
Federal funds purchased and agreements to repurchase securities	307,740	1,074,482
Accrued interest and other liabilities	1,421,067	1,512,717
Long-term borrowings	5,122,398	4,607,758
Total liabilities	72,512,675	72,806,210
Shareholders' equity
Preferred stock, $1.00 par, 1,000,000 shares authorized; Issued and outstanding: Liquidation preference of $1,000 per share: 381,500 shares at June 30, 2013 and December 31, 2012; Liquidation preference of $10,000 per share: 50,000 shares at June 30, 2013 and December 31, 2012	876,796	872,500
Common stock, $.50 par, 250,000,000 shares authorized, 129,416,718 shares issued at June 30, 2013; 128,176,912 shares issued at December 31, 2012	64,709	64,088
Common stock issuable, 46,813 shares at June 30, 2013; 57,409 shares at December 31, 2012	2,860	3,473
Additional paid-in capital	3,112,666	3,025,520
Retained earnings	6,887,070	6,477,276
Accumulated other comprehensive income (loss), net	(227,771)	(240,264)
Total shareholders' equity	10,716,330	10,202,593
Total liabilities and shareholders' equity	$ 83,229,005	$ 83,008,803