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Consolidated Statements of Changes in Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Unallocated Common Stock Held By ESOP [Member]
Accumulated Other Comprehensive Income [Member]
Retained Earnings [Member]
Stockholders' equity at beginning of period at Dec. 31, 2011 $ 1,408,679 $ 57,837 $ 468,281 $ (3,620) $ 457,229 $ 428,952
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 21,401         21,401
Other comprehensive income (loss) 254,957       254,957  
Conversion of subordinated debentures 19,591 2,564 17,027      
Allocation of common stock by ESOP, including excess income tax benefits 721   32 689    
Share-based compensation, including excess income tax benefits 5,495   5,495      
Issuance of common stock under compensation plans, including excess income tax benefits 4,109 1,147 2,962      
Warrants to be settled in cash 0          
Stockholders' equity at end of period at Sep. 30, 2012 1,714,953 61,548 493,797 (2,931) 712,186 450,353
Stockholders' equity at beginning of period at Dec. 31, 2012 1,720,237 61,751 496,715 (2,583) 686,807 477,547
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 202,325         202,325
Other comprehensive income (loss) (523,082)       (523,082)  
Allocation of common stock by ESOP, including excess income tax benefits 1,392   432 960    
Share-based compensation, including excess income tax benefits 7,492   7,492      
Issuance of common stock under compensation plans, including excess income tax benefits 26,418 2,755 23,663      
Extinguishment of convertible senior notes, net of tax, including 216,729 shares of common stock issued upon conversion 1,764 217 1,547      
Warrants to be settled in cash (41,878)   (41,878)      
Stockholders' equity at end of period at Sep. 30, 2013 $ 1,394,668 $ 64,723 $ 487,971 $ (1,623) $ 163,725 $ 679,872