Consolidated Balance Sheets (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash and due from banks	$ 455,482	$ 563,304
Interest-bearing deposits in other financial institutions	126,018	147,434
Federal funds sold and securities purchased under agreements to resell	20,745	27,135
Investment securities held to maturity at amortized cost	175,210	39,877
Investment securities available for sale, at fair value	5,250,585	4,926,758
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	181,249	166,774
Loans held for sale	64,738	261,410
Loans	15,896,261	15,411,022
Allowance for loan losses	(268,315)	(297,409)
Loans, net	15,627,946	15,113,613
Premises and equipment, net	270,890	253,958
Goodwill	929,168	929,168
Other intangible assets, net	74,464	61,176
Trading assets	43,728	70,711
Other assets	1,006,697	926,417
Total assets	24,226,920	23,487,735
LIABILITIES AND STOCKHOLDERS' EQUITY
Noninterest-bearing demand deposits	4,626,312	4,759,556
Interest-bearing deposits	12,640,855	12,180,309
Total deposits	17,267,167	16,939,865
Federal funds purchased and securities sold under agreements to repurchase	475,442	750,455
Other short-term funding	265,484	1,576,484
Long-term funding	3,087,267	1,015,346
Trading liabilities	46,470	76,343
Accrued expenses and other liabilities	193,800	192,843
Total liabilities	21,335,630	20,551,336
Stockholders' equity
Preferred equity	61,862	63,272
Common stock	1,750	1,750
Surplus	1,617,990	1,602,136
Retained earnings	1,392,508	1,281,811
Accumulated other comprehensive income (loss)	(24,244)	48,603
Treasury stock, at cost	(158,576)	(61,173)
Total stockholders' equity	2,891,290	2,936,399
Total liabilities and stockholders' equity	$ 24,226,920	$ 23,487,735
Preferred shares issued	63,549	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	10,874,182	4,773,146