Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 1,622,928	$ 1,449,547
Interest-bearing deposits at banks	411,994	154,960
Federal funds sold		2,850
Trading account	526,844	561,834
Investment securities (includes pledged securities that can be sold or repledged of $1,826,216 at September 30, 2012; $1,826,011 at December 31, 2011)
Available for sale (cost: $5,091,116 at September 30, 2012; $6,312,423 at December 31, 2011)	5,183,878	6,228,560
Held to maturity (fair value: $1,074,771 at September 30, 2012; $1,012,562 at December 31, 2011)	1,121,325	1,077,708
Other (fair value: $318,801 at September 30, 2012; $366,886 at December 31, 2011)	318,801	366,886
Total investment securities	6,624,004	7,673,154
Loans and leases	64,335,438	60,377,875
Unearned discount	(223,483)	(281,870)
Loans and leases, net of unearned discount	64,111,955	60,096,005
Allowance for credit losses	(921,223)	(908,290)
Loans and leases, net	63,190,732	59,187,715
Premises and equipment	589,035	581,435
Goodwill	3,524,625	3,524,625
Core deposit and other intangible assets	129,628	176,394
Accrued interest and other assets	4,465,443	4,611,773
Total assets	81,085,233	77,924,287
Liabilities
Noninterest-bearing deposits	22,968,401	20,017,883
NOW accounts	1,499,915	1,912,226
Savings deposits	33,163,780	31,001,083
Time deposits	4,972,409	6,107,530
Deposits at Cayman Islands office	1,402,753	355,927
Total deposits	64,007,258	59,394,649
Federal funds purchased and agreements to repurchase securities	592,154	732,059
Other short-term borrowings		50,023
Accrued interest and other liabilities	1,570,758	1,790,121
Long-term borrowings	4,969,536	6,686,226
Total liabilities	71,139,706	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 September 30, 2012 and December 31, 2011; Liquidation preference of $10,000 per share: 50,000 shares at September 30, 2012 and December 31, 2011	870,416	864,585
Common stock, $.50 par, 250,000,000 shares authorized, 127,403,420 shares issued at September 30, 2012; 125,683,398 shares issued at December 31, 2011	63,702	62,842
Common stock issuable, 57,316 shares at September 30, 2012; 68,220 shares at December 31, 2011	3,451	4,072
Additional paid-in capital	2,951,248	2,828,986
Retained earnings	6,286,785	5,867,165
Accumulated other comprehensive income (loss), net	(230,075)	(356,441)
Total shareholders' equity	9,945,527	9,271,209
Total liabilities and shareholders' equity	$ 81,085,233	$ 77,924,287