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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Oct. 07, 2011
Dec. 31, 2010
Dec. 31, 2009
Allowance for credit losses 2,256 2,548      
Amounts pledged 569,995 653,651      
Class A Stock [Member]
          
Common stock issued 13,508,318 13,572,265 13,572,265    
Common stock, shares outstanding 13,508,318 13,572,265   13,268,522 13,118,001
Class B Stock [Member]
          
Common stock issued 99,680 99,680      
Common stock, shares outstanding 99,680 99,680