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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

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