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Loans (Details 7) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Impaired loans as of and for the years ended      
Impaired loans without a valuation allowance $ 730 $ 446  
Impaired loans with a valuation allowance 3,861 1,408  
Total impaired loans 4,591 1,854  
Valuation allowance related to impaired loans 865 175  
Total non-accrual loans 4,828 2,131  
Total loans past-due ninety days or more and still accruing 1     
Average investment in impaired loans 3,436 5,466 10,136
Interest income recognized on impaired loans 26 1,230 61
Interest income recognized on a cash basis on impaired loans $ 21 $ 1,175 $ 41