Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
ASSETS
Cash and due from banks	$ 1,384,131	$ 1,175,083
Money market investments:
Interest-bearing deposits	6,386,353	8,175,048
Federal funds sold and security resell agreements	478,535	282,248
Investment securities:
Held-to-maturity, at adjusted cost (approximate fair value $643,926 and $609,547)	615,104	588,981
Available-for-sale, at fair value	3,462,809	3,701,886
Trading account, at fair value	56,572	34,559
Marketable securities, total	4,134,485	4,325,426
Loans held for sale	164,374	171,328
Loans, net of unearned income and fees:
Loans and Leases Receivable, Net of Deferred Income	39,630,363	39,043,365
Less allowance for loan losses	675,907	746,291
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered	38,954,456	38,297,074
Other noninterest-bearing investments	854,978	855,642
Premises and equipment, net	803,214	726,372
Goodwill	1,014,129	1,014,129
Core deposit and other intangibles	30,826	36,444
Other real estate owned	27,725	46,105
Other assets	878,069	926,228
Total assets	55,111,275	56,031,127
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand	19,609,990	18,758,753
Interest-bearing:
Savings and money market	23,308,114	23,029,928
Time	2,500,303	2,593,038
Foreign	252,207	1,980,161
Total deposits	45,670,614	46,361,880
Federal funds purchased and security repurchase agreements	258,401	340,348
Long-term debt	1,933,136	2,273,575
Reserve for unfunded lending commitments	95,472	89,705
Other liabilities	453,562	501,056
Total liabilities	48,411,185	49,566,564
Shareholders' equity:
Preferred stock, without par value, authorized 4,400,000 shares	1,004,006	1,003,970
Common stock, without par value; authorized 350,000,000 shares; issued and outstanding 185,112,965 and 184,677,696 shares	4,192,136	4,179,024
Retained earnings	1,640,785	1,473,670
Accumulated other comprehensive income (loss)	(136,837)	(192,101)
Total shareholders' equity	6,700,090	6,464,563
Total liabilities and shareholders' equity	$ 55,111,275	$ 56,031,127