Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 1,941,944	$ 1,983,615
Interest-bearing deposits at banks	1,925,811	129,945
Federal funds sold	117,809	3,000
Trading account	371,370	488,966
Investment securities (includes pledged securities that can be sold or repledged of $1,707,437 at September 30, 2013; $1,801,842 at December 31, 2012)
Available for sale (cost: $4,555,109 at September 30, 2013; $4,643,070 at December 31, 2012)	4,692,180	4,739,437
Held to maturity (fair value: $3,277,386 at September 30, 2013; $976,883 at December 31, 2012)	3,319,114	1,032,276
Other (fair value: $298,479 at September 30, 2013; $302,648 at December 31, 2012)	298,479	302,648
Total investment securities	8,309,773	6,074,361
Loans and leases	63,914,772	66,790,186
Unearned discount	(255,730)	(219,229)
Loans and leases, net of unearned discount	63,659,042	66,570,957
Allowance for credit losses	(916,370)	(925,860)
Loans and leases, net	62,742,672	65,645,097
Premises and equipment	614,795	594,652
Goodwill	3,524,625	3,524,625
Core deposit and other intangible assets	79,290	115,763
Accrued interest and other assets	4,799,396	4,448,779
Total assets	84,427,485	83,008,803
Liabilities
Noninterest-bearing deposits	24,150,771	24,240,802
NOW accounts	1,716,511	1,979,619
Savings deposits	36,536,906	33,783,947
Time deposits	3,831,443	4,562,366
Deposits at Cayman Islands office	316,510	1,044,519
Total deposits	66,552,141	65,611,253
Federal funds purchased and agreements to repurchase securities	246,019	1,074,482
Accrued interest and other liabilities	1,491,797	1,512,717
Long-term borrowings	5,121,326	4,607,758
Total liabilities	73,411,283	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 September 30, 2013 and December 31, 2012; Liquidation preference of $10,000 per share: 50,000 shares at September 30, 2013 and December 31, 2012	879,010	872,500
Common stock, $.50 par, 250,000,000 shares authorized, 130,194,232 shares issued at September 30, 2013; 128,176,912 shares issued at December 31, 2012	65,097	64,088
Common stock issuable, 47,048 shares at September 30, 2013; 57,409 shares at December 31, 2012	2,889	3,473
Additional paid-in capital	3,192,981	3,025,520
Retained earnings	7,074,287	6,477,276
Accumulated other comprehensive income (loss), net	(198,062)	(240,264)
Total shareholders' equity	11,016,202	10,202,593
Total liabilities and shareholders' equity	$ 84,427,485	$ 83,008,803