Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 720,858	$ 841,942
Money market investments:
Interest-bearing deposits	6,791,762	7,178,097
Federal funds sold and security resell agreements	1,519,352	1,386,291
Investment securities:
Held-to-maturity, at adjusted cost (approximate fair value $602,355 and $677,196)	590,950	647,252
Available-for-sale, at fair value	4,450,502	3,844,248
Trading account, at fair value	71,392	70,601
Marketable securities, total	5,112,844	4,562,101
Loans held for sale	128,946	132,504
Loans and leases, net of unearned income and fees:
Loans and leases receivable, net of unearned income and fees	40,180,114	40,063,658
Less allowance for loan losses	620,013	604,663
Loans, net of allowance	39,560,101	39,458,995
Other noninterest-bearing investments	870,125	865,950
Premises and equipment, net	844,900	829,809
Goodwill	1,014,129	1,014,129
Core deposit and other intangibles	23,162	25,520
Other real estate owned	17,256	18,916
Other assets	952,496	894,620
Total assets	57,555,931	57,208,874
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand	20,854,630	20,529,124
Interest-bearing:
Savings and money market	24,540,927	24,583,636
Time	2,344,818	2,406,924
Foreign	382,985	328,391
Total deposits	48,123,360	47,848,075
Federal funds and other short-term borrowings	203,597	244,223
Long-term debt	1,089,321	1,092,282
Reserve for unfunded lending commitments	82,287	81,076
Other liabilities	603,068	573,688
Total liabilities	50,101,633	49,839,344
Shareholders' equity:
Preferred stock, without par value, authorized 4,400,000 shares	1,004,032	1,004,011
Common stock, without par value; authorized 350,000,000 shares; issued and outstanding 203,192,991 and 203,014,903 shares	4,728,556	4,723,855
Retained earnings	1,836,619	1,769,705
Accumulated other comprehensive income (loss)	(114,909)	(128,041)
Total shareholders' equity	7,454,298	7,369,530
Total liabilities and shareholders' equity	$ 57,555,931	$ 57,208,874