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Loans - Purchased credit-impaired loans (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Loans    
Outstanding balance $ 2,489,000 $ 0
Carrying amount, net of allowance of $0 2,489,000 0
Allowance for loan losses 0 0
Real estate
   
Loans    
Outstanding balance $ 2,489,000 $ 0