CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock Member	Preferred Stock Member	Additional Paid In Capital Member	Retained Earnings Member	Treasury Stock Member	Accumulated other comprehensive income (loss)
Beginning Balance at Dec. 31, 2011	$ 3,918,753	$ 1,026	$ 50,160	$ 4,123,898	$ (212,726)	$ (1,057)	$ (42,548)
Net Income	161,335				161,335
Issuance of stock	7,788	5		7,783
Dividends Abstract
Dividends, Preferred Stock, Cash	(2,792)				(2,792)
Deemed dividend on preferred stock	0
Stock Issued During Period, Value, Treasury Stock Reissued	1,063					1,063
Treasury Stock Value Acquired Cost Method	(276)					(276)
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent	(16,887)						(16,887)
Transfers To Statutory Reserve	0
Ending Balance at Sep. 30, 2012	4,068,984	1,031	50,160	4,131,681	(54,183)	(270)	(59,435)
Beginning Balance at Dec. 31, 2012	4,110,000	1,032	50,160	4,150,294	11,826	(444)	(102,868)
Net Income	436,296				436,296
Issuance of stock	4,952	2		4,950
Dividends Abstract
Dividends, Preferred Stock, Cash	(2,792)				(2,792)
Deemed dividend on preferred stock	0
Stock Issued During Period, Value, Treasury Stock Reissued	33					33
Treasury Stock Value Acquired Cost Method	(466)					(466)
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent	(154,138)						(154,138)
Transfers To Statutory Reserve	0
Ending Balance at Sep. 30, 2013	$ 4,393,885	$ 1,034	$ 50,160	$ 4,155,244	$ 445,330	$ (877)	$ (257,006)