Consolidated Balance Sheets (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
ASSETS
Cash and due from banks	$ 526,951	$ 455,482
Interest-bearing deposits in other financial institutions	92,071	126,018
Federal funds sold and securities purchased under agreements to resell	4,400	20,745
Investment securities held to maturity at amortized cost	193,759	175,210
Investment securities available for sale, fair value	5,277,908	5,250,585
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	181,360	181,249
Loans held for sale	46,529	64,738
Loans	16,441,444	15,896,261
Allowance for loan losses	(267,916)	(268,315)
Loans, net	16,173,528	15,627,946
Premises and equipment, net	269,257	270,890
Goodwill	929,168	929,168
Other intangible assets, net	72,629	74,464
Trading assets	40,822	43,728
Other assets	997,815	1,006,697
Total assets	24,806,197	24,226,920
LIABILITIES AND STOCKHOLDERS' EQUITY
Noninterest-bearing demand deposits	4,478,981	4,626,312
Interest-bearing deposits	13,030,946	12,640,855
Total deposits	17,509,927	17,267,167
Federal funds purchased and securities sold under agreements to repurchase	939,254	475,442
Other short-term funding	308,652	265,484
Long-term funding	2,932,040	3,087,267
Trading liabilities	43,450	46,470
Accrued expenses and other liabilities	171,850	193,800
Total liabilities	21,905,173	21,335,630
Stockholders' equity
Preferred equity	61,158	61,862
Common stock	1,750	1,750
Surplus	1,623,323	1,617,990
Retained earnings	1,402,549	1,392,508
Accumulated other comprehensive income (loss)	(11,577)	(24,244)
Treasury stock, at cost	(176,179)	(158,576)
Total stockholders' equity	2,901,024	2,891,290
Total liabilities and stockholders' equity	$ 24,806,197	$ 24,226,920
Preferred shares issued	62,826	63,549
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	11,867,756	10,874,182