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Loans (Details 7) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Impaired loans as of and for the years ended      
Impaired loans without a valuation allowance $ 1,119 $ 362 $ 730
Impaired loans with a valuation allowance 3,025 1,505 3,861
Total impaired loans 4,144 1,867 4,591
Valuation allowance related to impaired loans 860 191 865
Total non-accrual loans 4,582 2,923 4,828
Total loans past-due ninety days or more and still accruing 3   1
Average investment in impaired loans $ 4,321 $ 1,954 $ 4,468