CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Preferred stock [Member]	Common stock [Member]	Common stock issuable [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Accumulated other comprehensive income (loss), net [Member]
Beginning Balance at Dec. 31, 2011	$ 9,271,209	$ 864,585	$ 62,842	$ 4,072	$ 2,828,986	$ 5,867,165	$ (356,441)
Total comprehensive income	231,646					206,463	25,183
Preferred stock cash dividends	(13,363)					(13,363)
Amortization of preferred stock discount		1,904				(1,904)
Stock-based compensation plans:
Compensation expense, net	7,990		207		7,783
Exercises of stock options, net	19,612		183		19,429
Directors' stock plan	372		2		370
Deferred compensation plans, net, including dividend equivalents	(174)		4	(645)	507	(40)
Other	481				481
Common stock cash dividends-$.70 per share	(89,085)					(89,085)
Ending Balance at Mar. 31, 2012	9,428,688	866,489	63,238	3,427	2,857,556	5,969,236	(331,258)
Beginning Balance at Dec. 31, 2012	10,202,593	872,500	64,088	3,473	3,025,520	6,477,276	(240,264)
Total comprehensive income	288,424					274,113	14,311
Preferred stock cash dividends	(13,363)					(13,363)
Amortization of preferred stock discount		2,127				(2,127)
Exercise of 407,542 Series C stock warrants into 186,589 shares of common stock			93		(93)
Stock-based compensation plans:
Compensation expense, net	13,071		160		12,911
Exercises of stock options, net	21,570		126		21,444
Directors' stock plan	776		4		772
Deferred compensation plans, net, including dividend equivalents	(108)		5	(644)	563	(32)
Other	666				666
Common stock cash dividends-$.70 per share	(90,672)					(90,672)
Ending Balance at Mar. 31, 2013	$ 10,422,957	$ 874,627	$ 64,476	$ 2,829	$ 3,061,783	$ 6,645,195	$ (225,953)