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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 (Loss) [Member]
Retained Earnings [Member]
Stockholders' equity at beginning of period at Dec. 31, 2010 $ 938,047 $ 56,968 $ 454,454 $ (4,815) $ 81,820 $ 349,620
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 86,248         86,248
Other comprehensive income (loss) 375,409       375,409  
Acquisition of common stock (484) (48) (436)      
Allocation of common stock by ESOP, including excess income tax benefits 1,255   60 1,195    
Share-based compensation, including excess income tax benefits 10,320   10,320      
Issuance of common stock under compensation plans, including excess income tax benefits 4,800 917 3,883      
Dividends on common stock (6,916)         (6,916)
Stockholders' equity at end 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 57,798         57,798
Other comprehensive income (loss) 229,578       229,578  
Conversion of subordinated debentures 19,591 2,564 17,027      
Allocation of common stock by ESOP, including excess income tax benefits 1,085   48 1,037    
Share-based compensation, including excess income tax benefits 6,904   6,904      
Issuance of common stock under compensation plans, including excess income tax benefits 5,805 1,350 4,455      
Dividends on common stock (9,203)         (9,203)
Stockholders' equity at end 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 253,283         253,283
Other comprehensive income (loss) (640,611)       (640,611)  
Allocation of common stock by ESOP, including excess income tax benefits 3,390   1,438 1,952    
Share-based compensation, including excess income tax benefits 13,624   13,624      
Issuance of common stock under compensation plans, including excess income tax benefits 32,735 3,295 29,440      
Extinguishment of convertible senior notes, net of tax, including 5,489,808 shares of common stock issued upon conversion 62,663 5,489 57,174      
Warrants to be settled in cash (47,991)   (47,991)      
Dividends on common stock (12,643)         (12,643)
Stockholders' equity at end of period at Dec. 31, 2013 $ 1,384,687 $ 70,535 $ 550,400 $ (631) $ 46,196 $ 718,187