Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and due from banks	$ 336,247	$ 563,304
Interest-bearing deposits in other financial institutions	82,555	147,434
Federal funds sold and securities purchased under agreements to resell	8,600	27,135
Investment securities held to maturity at amortized cost	54,123	39,877
Investment securities available for sale, at fair value	4,950,317	4,926,758
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	152,490	166,774
Loans held for sale	173,389	261,410
Loans	15,551,562	15,411,022
Allowance for loan losses	(286,923)	(297,409)
Loans, net	15,264,639	15,113,613
Premises and equipment, net	254,674	253,958
Goodwill	929,168	929,168
Other intangible assets, net	66,294	61,176
Trading Assets	65,014	70,711
Other assets	940,258	926,417
Total assets	23,277,768	23,487,735
LIABILITIES AND STOCKHOLDERS' EQUITY
Noninterest-bearing demand deposits	4,453,109	4,759,556
Interest-bearing deposits	12,968,185	12,180,309
Total deposits	17,421,294	16,939,865
Federal funds purchased and securities sold under agreements to repurchase	730,855	750,455
Other short-term funding	1,038,697	1,576,484
Long-term funding	915,063	1,015,346
Trading liabilities	70,236	76,343
Accrued expenses and other liabilities	165,358	192,843
Total liabilities	20,341,503	20,551,336
Stockholders' equity
Preferred equity	63,272	63,272
Common stock	1,750	1,750
Surplus	1,605,966	1,602,136
Retained earnings	1,297,692	1,281,811
Accumulated other comprehensive income	42,991	48,603
Treasury stock, at cost	(75,406)	(61,173)
Total stockholders' equity	2,936,265	2,936,399
Total liabilities and stockholders' equity	$ 23,277,768	$ 23,487,735
Preferred shares issued	65,000	65,000
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Common shares issued	175,012,686	175,012,686
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Treasury shares of common stock	5,742,370	4,773,146