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Stock Options, ESOP, and Restricted Shares (Details 3) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2011
Mar. 31, 2013
Dec. 31, 2012
Summary activity for unvested restricted awards      
Shares Awarded, Number of shares   2,777,250  
Restricted Stock
     
Summary activity for unvested restricted awards      
Unvested options, Number of shares, Beginning Balance   92,205  
Shares Awarded, Number of shares 94,426    16,664
Restrictions lapsed and shares released, Number of Shares   (18,885)  
Shares forfeited, Number of Shares       
Unvested options, Number of shares, Ending Balance   73,320 92,205
Unvested options, Weighted-Average Grant Date Fair Value, Beginning Balance   $ 13.45  
Shares awarded, Grant Date Weighted-Average Cost $ 12.75    $ 16.65
Restrictions lapsed and shares released, Grant Date Weighted-Average Cost   $ 12.75  
Shares forfeited, Grant Date Weighted-Average Cost       
Unvested options, Weighted-Average Grant Date Fair Value, Ending Balance   $ 13.63 $ 13.45