Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Cash and due from banks	$ 526,009	$ 563,304
Interest-bearing deposits in other financial institutions	277,761	147,434
Federal funds sold and securities purchased under agreements to resell	25,400	27,135
Investment securities held to maturity at amortized cost	125,095	39,877
Investment securities available for sale, fair value	4,840,035	4,926,758
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	181,129	166,774
Loans held for sale	102,052	261,410
Loans	15,585,854	15,411,022
Allowance for loan losses	(271,724)	(297,409)
Loans, net	15,314,130	15,113,613
Premises and equipment, net	265,636	253,958
Goodwill	929,168	929,168
Other intangible assets, net	75,730	61,176
Trading Assets	49,402	70,711
Other assets	977,128	926,417
Total assets	23,688,675	23,487,735
LIABILITIES AND STOCKHOLDERS' EQUITY
Noninterest-bearing demand deposits	4,453,663	4,759,556
Interest-bearing deposits	13,884,245	12,180,309
Total deposits	18,337,908	16,939,865
Federal funds purchased and securities sold under agreements to repurchase	580,479	750,455
Other short-term funding	1,046,401	1,576,484
Long-term funding	614,568	1,015,346
Trading liabilities	52,430	76,343
Accrued expenses and other liabilities	184,607	192,843
Total liabilities	20,816,393	20,551,336
Stockholders' equity
Preferred equity	62,737	63,272
Common stock	1,750	1,750
Surplus	1,614,516	1,602,136
Retained earnings	1,361,498	1,281,811
Accumulated other comprehensive income (loss)	(37,120)	48,603
Treasury stock, at cost	(131,099)	(61,173)
Total stockholders' equity	2,872,282	2,936,399
Total liabilities and stockholders' equity	$ 23,688,675	$ 23,487,735
Preferred shares issued	64,450	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	9,175,725	4,773,146