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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Oct. 07, 2011
Allowance for credit losses $ 2,434   $ 2,256        
Amounts pledged $ 805,399   $ 569,995        
Class A Stock [Member]
              
Common stock, shares issued 13,442,759   13,508,318       13,572,265
Common stock, shares outstanding 13,442,759 13,496,783 13,508,318 13,515,012 13,489,162 13,572,265 13,572,265
Class B Stock [Member]
              
Common stock, shares issued 99,680   99,680        
Common stock, shares outstanding 99,680   99,680