CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common stock, including treasury stock	Preferred Stock Member	Additional Paid In Capital Member	Retained Earnings Member	Accumulated other comprehensive income (loss)
Beginning Balance at Dec. 31, 2010	$ 3,800,531	$ 9,655	$ 50,160	$ 4,094,005	$ (347,328)	$ (5,961)
Net Income (Loss) Attributable to Parent	10,132				10,132
Issuance of stock	2,247	7	0	2,240
Dividends Abstract
Dividends, Preferred Stock, Cash	(930)				(930)
Treasury Stock Value Acquired Cost Method	(33)	(33)
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent	(7,041)					(7,041)
Transfers To Statutory Reserve	0
Ending Balance at Mar. 31, 2011	3,804,906	9,629	50,160	4,096,245	(338,126)	(13,002)
Beginning Balance at Dec. 31, 2011	3,918,753	9,206	50,160	4,114,661	(212,726)	(42,548)
Net Income (Loss) Attributable to Parent	48,408				48,408
Issuance of stock	2,062	13		2,049
Dividends Abstract
Dividends, Preferred Stock, Cash	(931)				(931)
Stock Issued During Period, Value, Treasury Stock Reissued	22	22
Treasury Stock Value Acquired Cost Method	(6)	(6)
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent	(1,237)					(1,237)
Transfers To Statutory Reserve	0
Ending Balance at Mar. 31, 2012	$ 3,967,071	$ 9,235	$ 50,160	$ 4,116,710	$ (165,249)	$ (43,785)