CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Loans:	$ 6,010,681	$ 5,686,749
Allowance for loan losses	(69,881)	(71,426)
Net loans	5,940,800	5,615,323
Loans held for sale	6,305	3,877
Investment Securities:
Available for sale	6,841,584	6,937,463
Held to maturity (market value of $142,531 and $129,495, respectively)	129,498	114,756
Trading securities	72,588	55,764
Federal Reserve Bank stock and other	26,127	26,333
Total investment securities	7,069,797	7,134,316
Federal funds sold and securities purchased under agreements to resell	19,046	89,868
Interest-bearing due from banks	1,631,163	720,500
Cash and due from banks	319,535	667,774
Bank premises and equipment, net	244,678	244,600
Accrued income	70,510	69,749
Goodwill	209,758	209,758
Other intangibles	65,348	68,803
Other assets	128,530	102,628
Total assets	15,705,470	14,927,196
Deposits:
Noninterest-bearing demand	5,597,601	4,920,581
Interest-bearing demand and savings	5,895,219	5,450,450
Time deposits under $100,000	525,174	540,269
Time deposits of $100,000 or more	541,464	742,065
Total deposits	12,559,458	11,653,365
Federal funds purchased and repurchase agreements	1,659,343	1,787,270
Short-term debt	415
Long-term debt	4,393	5,879
Accrued expenses and taxes	152,114	182,468
Other liabilities	44,189	18,869
Total liabilities	14,419,912	13,647,851
SHAREHOLDERS' EQUITY
Common stock, $1.00 par value; 80,000,000 shares authorized, 55,056,730 shares issued, and 40,520,464 and 40,340,878 shares outstanding, respectively	55,057	55,057
Capital surplus	732,209	732,069
Retained earnings	813,245	787,015
Accumulated other comprehensive income	63,572	85,588
Treasury stock, 14,536,266 and 14,715,852 shares, at cost, respectively	(378,525)	(380,384)
Total shareholders' equity	1,285,558	1,279,345
Total liabilities and shareholders' equity	$ 15,705,470	$ 14,927,196