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	114,147				114,147
Issuance of stock	3,320	2		3,318
Dividends Abstract
Dividends, Preferred Stock, Cash	(1,861)				(1,861)
Deemed dividend on preferred stock	0
Stock Issued During Period, Value, Treasury Stock Reissued	1,063					1,063
Treasury Stock Value Acquired Cost Method	(150)					(150)
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent	(14,035)						(14,035)
Transfers To Statutory Reserve	0
Ending Balance at Jun. 30, 2012	4,021,237	1,028	50,160	4,127,216	(100,440)	(144)	(56,583)
Beginning Balance at Dec. 31, 2012	4,110,000	1,032	50,160	4,150,294	11,826	(444)	(102,868)
Net Income	207,161				207,161
Issuance of stock	3,232	1		3,231
Dividends Abstract
Dividends, Preferred Stock, Cash	(1,861)				(1,861)
Deemed dividend on preferred stock	0
Treasury Stock Value Acquired Cost Method	(325)					(325)
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent	(123,171)						(123,171)
Transfers To Statutory Reserve	0
Ending Balance at Jun. 30, 2013	$ 4,195,036	$ 1,033	$ 50,160	$ 4,153,525	$ 217,126	$ (769)	$ (226,039)