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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Oct. 07, 2011
Sep. 30, 2011
Jun. 30, 2011
Jan. 01, 2011
Allowance for credit losses 2,240   2,548        
Amounts pledged 725,412   653,651        
Class A Stock [Member]
              
Common stock issued 13,515,012   13,572,265 13,572,265      
Common stock, shares outstanding 13,515,012 13,489,162 13,572,265   13,570,945 13,568,945 13,268,522
Class B Stock [Member]
              
Common stock issued 99,680   99,680        
Common stock, shares outstanding 99,680   99,680