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Consolidated Statements of Changes in Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Unallocated Common Stock Held by ESOP [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' equity at beginning of period at Dec. 31, 2011 $ 1,408,679 $ 57,837 $ 468,281 $ (3,620) $ 428,952 $ 457,229
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 29,230       29,230  
Other comprehensive income 122,643         122,643
Conversion of subordinated debentures   1,550 10,291      
Allocation of common stock by ESOP, including excess income tax benefits     22 445    
Share-based compensation, including excess income tax benefits     3,719      
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures   822 250      
Debt Conversion, Converted Instrument, Shares Issued 0          
Stockholders' equity at end of period at Jun. 30, 2012 1,577,651 60,209 482,563 (3,175) 458,182 579,872
Stockholders' equity at beginning of period at Dec. 31, 2012 1,720,237 61,751 496,715 (2,583) 477,547 686,807
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 146,144       146,144  
Other comprehensive income (442,527)         (442,527)
Allocation of common stock by ESOP, including excess income tax benefits     134 574    
Share-based compensation, including excess income tax benefits     3,193      
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures   1,533 11,024      
Debt Conversion, Converted Instrument, Shares Issued 216,729 217,000 1,547,000      
Stockholders' equity at end of period at Jun. 30, 2013 $ 1,442,076 $ 63,501 $ 512,613 $ (2,009) $ 623,691 $ 244,280