Consolidated Balance Sheet (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 1,344,092	$ 1,449,547
Interest-bearing deposits at banks	1,282,040	154,960
Federal funds sold		2,850
Trading account	517,620	561,834
Investment securities (includes pledged securities that can be sold or repledged of $1,816,595 at March 31, 2012; $1,826,011 at December 31, 2011)
Available for sale (cost: $5,892,799 at March 31, 2012; $6,312,423 at December 31, 2011)	5,838,022	6,228,560
Held to maturity (fair value: $929,478 at March 31, 2012; $1,012,562 at December 31, 2011)	1,000,294	1,077,708
Other (fair value: $356,980 at March 31, 2012; $366,886 at December 31, 2011)	356,980	366,886
Total investment securities	7,195,296	7,673,154
Loans and leases	61,185,392	60,377,875
Unearned discount	(263,642)	(281,870)
Loans and leases, net of unearned discount	60,921,750	60,096,005
Allowance for credit losses	(909,006)	(908,290)
Loans and leases, net	60,012,744	59,187,715
Premises and equipment	580,033	581,435
Goodwill	3,524,625	3,524,625
Core deposit and other intangible assets	159,619	176,394
Accrued interest and other assets	4,570,818	4,611,773
Total assets	79,186,887	77,924,287
Liabilities
Noninterest-bearing deposits	20,648,970	20,017,883
NOW accounts	1,875,461	1,912,226
Savings deposits	32,225,733	31,001,083
Time deposits	5,767,588	6,107,530
Deposits at Cayman Islands office	395,191	355,927
Total deposits	60,912,943	59,394,649
Federal funds purchased and agreements to repurchase securities	461,977	732,059
Other short-term borrowings	50,004	50,023
Accrued interest and other liabilities	1,856,749	1,790,121
Long-term borrowings	6,476,526	6,686,226
Total liabilities	69,758,199	68,653,078
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 March 31, 2012 and December 31, 2011; Liquidation preference of $10,000 per share: 50,000 shares at March 31, 2012 and December 31, 2011.	866,489	864,585
Common stock, $.50 par, 250,000,000 shares authorized, 126,476,266 shares issued at March 31, 2012; 125,683,398 shares issued at December 31, 2011	63,238	62,842
Common stock issuable, 57,385 shares at March 31, 2012; 68,220 shares at December 31, 2011	3,427	4,072
Additional paid-in capital	2,857,556	2,828,986
Retained earnings	5,969,236	5,867,165
Accumulated other comprehensive income (loss), net	(331,258)	(356,441)
Total shareholders' equity	9,428,688	9,271,209
Total liabilities and shareholders' equity	$ 79,186,887	$ 77,924,287