Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
ASSETS
Cash and due from banks	$ 381,287	$ 455,482
Interest-bearing deposits in other financial institutions	74,945	126,018
Federal funds sold and securities purchased under agreements to resell	18,320	20,745
Investment securities held to maturity at amortized cost	301,941	175,210
Investment securities available for sale, fair value	5,345,422	5,250,585
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	188,875	181,249
Loans held for sale	141,672	64,738
Loans	17,159,090	15,896,261
Allowance for loan losses	(266,262)	(268,315)
Loans, net	16,892,828	15,627,946
Premises and equipment, net	272,283	270,890
Goodwill	929,168	929,168
Other intangible assets, net	69,201	74,464
Trading assets	34,005	43,728
Other assets	1,003,875	1,006,697
Total assets	25,653,822	24,226,920
LIABILITIES AND STOCKHOLDERS' EQUITY
Noninterest-bearing demand deposits	4,302,454	4,626,312
Interest-bearing deposits	13,898,804	12,640,855
Total deposits	18,201,258	17,267,167
Federal funds purchased and securities sold under agreements to repurchase	765,641	475,442
Other short-term funding	664,539	265,484
Long-term funding	2,931,547	3,087,267
Trading liabilities	36,003	46,470
Accrued expenses and other liabilities	185,256	193,800
Total liabilities	22,784,244	21,335,630
Stockholders' equity
Preferred equity	61,024	61,862
Common stock	1,719	1,750
Surplus	1,583,032	1,617,990
Retained earnings	1,466,525	1,392,508
Accumulated other comprehensive income (loss)	(1,725)	(24,244)
Treasury stock, at cost	(240,997)	(158,576)
Total stockholders' equity	2,869,578	2,891,290
Total liabilities and stockholders' equity	$ 25,653,822	$ 24,226,920
Preferred shares issued	62,689	63,549
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Common shares issued	171,888,747	175,012,686
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Treasury shares of common stock	15,126,171	10,874,182